Thu Jan 16, 2014 4:49 pm

Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
 
Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
Thu Jan 16, 2014 4:49 pm linkquote
Get one. Just do it. Don't even ask.
Edit 6/18/15: in case you don't read this thread in it's entirety, I take it back. Seems the lack of a vent tube causes issues with air bubble that won't work out of the fuel hose once it's run dry on reserve or run empty. This on a large frame as the hose must travel downward and up again. Working fine for my smallframe where the hose travels downward only.

Last edited by scootermarc69 on Thu Jun 18, 2015 4:37 am; edited 1 time in total
Thu Jan 16, 2014 4:51 pm

Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
 
Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
Thu Jan 16, 2014 4:51 pm linkquote
Re: BGM faster flow tap
scootermarc69 wrote:
Get one. Just do it. Don't even ask.




Thu Jan 16, 2014 5:59 pm

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 8110
Location: Victoria, Australia
 
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 8110
Location: Victoria, Australia
Thu Jan 16, 2014 5:59 pm linkquote
Ok. Done that.

Now what?
Thu Jan 16, 2014 6:04 pm

Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
 
Mr. Clean
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Location: This is't my locker!
Thu Jan 16, 2014 6:04 pm linkquote
Ginch wrote:
Ok. Done that.

Now what?
Put gas in the tank.. it will come out the end of the tap!












or.. take it out, and get the new one from DGSpeed... it's even more amazing!
Thu Jan 16, 2014 6:12 pm

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 8110
Location: Victoria, Australia
 
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 8110
Location: Victoria, Australia
Thu Jan 16, 2014 6:12 pm linkquote
Vader19 wrote:
Ginch wrote:
Ok. Done that.

Now what?
Put gas in the tank.. it will come out the end of the tap!
Damn those crazy Germans, they're hilarious!
Vader19 wrote:
or.. take it out, and get the new one from DGSpeed... it's even more amazing!
Tell me more... although if it doesn't come slightly too big to fit and requires M7.63 bolts (not included), I'm not interested.
Thu Jan 16, 2014 7:30 pm

Mr. Clean
P,SUPER,V90, 50 Special
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Mr. Clean
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Location: This is't my locker!
Thu Jan 16, 2014 7:30 pm linkquote
Ahhh.. don't worry, they're really hard to find.. impossible really... so we'll just stick w/ the BGM... they're awesome! with OR without the reserve light!
Thu Jan 16, 2014 7:59 pm

Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
 
Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
Thu Jan 16, 2014 7:59 pm linkquote
Pretty much every tuned scooter I ever owned ( and every smallframe) took 30-60 seconds to idle down after a long WOT. No idle jet upsize ever cured that. I had the BGM on the shelf for must be a year. Needed to drain the tank to put it in last night and noticed a burble noise from the tank as it drained and the clear hose I was using wasn't full of gas but had air percolating in there too. Seems the vent tube of the standard setup creates a bit of a Venturi. The BGM doe 't have the vent tube. I was curious as the BGM hose barb was clearly smaller than the stock one, so how could it flow 400% more fuel? Long story long, I rode some long fast straights today and my idle came right down every time. I'm finally keeping the float bowl full and I'm sold on this tap.
Thu Jan 16, 2014 8:25 pm

Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
 
Mr. Clean
P,SUPER,V90, 50 Special
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Thu Jan 16, 2014 8:25 pm linkquote
No need for a fuel pump either!
Thu Jan 16, 2014 9:17 pm

Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
Thu Jan 16, 2014 9:17 pm linkquote
I was just looking at my SIP order to make sure I had all the goodies I wanted before I left this wintery hemisphere, and had been contemplating a fast flow tap, I'm feeling more convinced after this thread.....thanks for the perfect timing. Well, I say thanks , my bank account says
Thu Jan 16, 2014 9:24 pm

Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
 
Mr. Clean
P,SUPER,V90, 50 Special
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Location: This is't my locker!
Thu Jan 16, 2014 9:24 pm linkquote
AlanMac wrote:
I was just looking at my SIP order to make sure I had all the goodies I wanted before I left this wintery hemisphere, and had been contemplating a fast flow tap, I'm feeling more convinced after this thread.....thanks for the perfect timing. Well, I say thanks , my bank account says
But Alan, don't get the SIP fast flow... it's not Nearly as good as the BGM.. if SIP sell it get it, but if not, order one from Scooter Center.. You gotta get the BGM one! Trust!
Thu Jan 16, 2014 10:06 pm

Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
Thu Jan 16, 2014 10:06 pm linkquote
I hear you Vadar! I will look in to where and snaffle it up. Thanks for the heads up though!
Thu Jan 16, 2014 10:46 pm

Hooked
150 GLx, Rally 200
Joined: 09 Jun 2013
Posts: 256
Location: Netherlands
 
Hooked
150 GLx, Rally 200
Joined: 09 Jun 2013
Posts: 256
Location: Netherlands
Thu Jan 16, 2014 10:46 pm linkquote
One thing to get used to, though: reserve comes on quite early, compared to other fuel taps.
Thu Jan 16, 2014 10:48 pm

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 8110
Location: Victoria, Australia
 
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 8110
Location: Victoria, Australia
Thu Jan 16, 2014 10:48 pm linkquote
AlanMac wrote:
I hear you Vadar! I will look in to where and snaffle it up. Thanks for the heads up though!
SCK sell them. Though depending where you are the postage can be very expensive.

If you're in the US then here - http://jet200.com/catalog/product_info.php?products_id=1926


The thing I love about my BGM fast flow tap is this. I often trailer my scooter as all my riding mates live at least 100k's away. If I had more than half a tank of fuel in it, the shaking & bumping would invariably get past the closed tap and into the crankcase. Meaning the only way to get it going was pushing.

Now, with the tap turned off you can tip the scooter right over and it won't flood... it's 100% shut.
Thu Jan 16, 2014 10:50 pm

Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
Thu Jan 16, 2014 10:50 pm linkquote
Ah. Thanks for the heads up on that. Always good to know. I presume that the difference can be seen in the normal intake height compared to the standard tap?
Thu Jan 16, 2014 11:28 pm

Hooked
150 GLx, Rally 200
Joined: 09 Jun 2013
Posts: 256
Location: Netherlands
 
Hooked
150 GLx, Rally 200
Joined: 09 Jun 2013
Posts: 256
Location: Netherlands
Thu Jan 16, 2014 11:28 pm linkquote
Here's a BGM vs a SIP Fast Flow pic:
http://modernvespa.com/forum/post1729222#1729222
Thu Jan 16, 2014 11:38 pm

Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
Thu Jan 16, 2014 11:38 pm linkquote
Quite a difference! Thanks for that.
Thu Jan 16, 2014 11:47 pm

Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
 
Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
Thu Jan 16, 2014 11:53 pm

Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
Thu Jan 16, 2014 11:53 pm linkquote
Shall check it out later today thanks. Just sitting on plane about to depart to Edinburgh. The comparison will be great to see though. Thanks for the tip.
Fri Jan 17, 2014 8:34 am

Hooked
1980 Vespa P200e - 1962 Lambretta TV175 - 1995 Vespa PX208 Polini - 1990 Honda S50
Joined: 10 Jan 2011
Posts: 388
Location: South Florida, USA
 
Hooked
1980 Vespa P200e - 1962 Lambretta TV175 - 1995 Vespa PX208 Polini - 1990 Honda S50
Joined: 10 Jan 2011
Posts: 388
Location: South Florida, USA
Fri Jan 17, 2014 8:34 am linkquote
Upgrade?
Is this something for everyone to get... or is it for tuned 200+cc? My Scooter is all stock except muffler(sip road sport) and the carb(26/26). Should I buy this? .... What say you?
Fri Jan 17, 2014 8:40 am

nothing at all
Joined: 14 Nov 2008
Posts: 9657
Location: westla
 
nothing at all
Joined: 14 Nov 2008
Posts: 9657
Location: westla
Fri Jan 17, 2014 8:40 am linkquote
Re: Upgrade?
roggerdavid wrote:
Is this something for everyone to get... or is it for tuned 200+cc? My Scooter is all stock except muffler(sip road sport) and the carb(26/26). Should I buy this? .... What say you?
At 24 bucks how can you go wrong.

I spend that walking out the door.
Fri Jan 17, 2014 8:41 am

Hooked
1980 Vespa P200e - 1962 Lambretta TV175 - 1995 Vespa PX208 Polini - 1990 Honda S50
Joined: 10 Jan 2011
Posts: 388
Location: South Florida, USA
 
Hooked
1980 Vespa P200e - 1962 Lambretta TV175 - 1995 Vespa PX208 Polini - 1990 Honda S50
Joined: 10 Jan 2011
Posts: 388
Location: South Florida, USA
Fri Jan 17, 2014 8:41 am linkquote
Re: Upgrade?
jimmyb865 wrote:
roggerdavid wrote:
Is this something for everyone to get... or is it for tuned 200+cc? My Scooter is all stock except muffler(sip road sport) and the carb(26/26). Should I buy this? .... What say you?
At 24 bucks how can you go wrong.

I spend that walking out the door.
Will do then.
Fri Jan 17, 2014 9:54 am

Evil
p2, jet2, lml166
Joined: 17 May 2013
Posts: 666
Location: Philadelphia, United States
 
Evil
p2, jet2, lml166
Joined: 17 May 2013
Posts: 666
Location: Philadelphia, United States
Fri Jan 17, 2014 9:54 am linkquote
i'm probably going to get one of these.
Fri Jan 17, 2014 10:00 am

Ossessionato
2 - Many
Joined: 07 Apr 2008
Posts: 3118
Location: Boca Raton, Florida
 
Ossessionato
2 - Many
Joined: 07 Apr 2008
Posts: 3118
Location: Boca Raton, Florida
Fri Jan 17, 2014 10:00 am linkquote
Re: Upgrade?
roggerdavid wrote:
jimmyb865 wrote:
roggerdavid wrote:
Is this something for everyone to get... or is it for tuned 200+cc? My Scooter is all stock except muffler(sip road sport) and the carb(26/26). Should I buy this? .... What say you?
At 24 bucks how can you go wrong.

I spend that walking out the door.
Will do then.
Order a new sight glass gasket too!
Fri Jan 17, 2014 10:22 am

Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
 
Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
Fri Jan 17, 2014 10:22 am linkquote
jimmyb865 wrote:
I spend that walking out the door.
When you go to buy your wardrobe for the year.



OH!!!
Fri Jan 17, 2014 11:12 am

Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
 
Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
Fri Jan 17, 2014 11:12 am linkquote
I was decided not to buy fast flow tap, yet. Then I saw this thread. As my tanks are already taken parts so why not. Now I'm waiting not only the tap but package worth of 100EUR.
Fri Jan 17, 2014 11:32 am

nothing at all
Joined: 14 Nov 2008
Posts: 9657
Location: westla
 
nothing at all
Joined: 14 Nov 2008
Posts: 9657
Location: westla
Fri Jan 17, 2014 11:32 am linkquote
Vader19 wrote:
jimmyb865 wrote:
I spend that walking out the door.
When you go to buy your wardrobe for the year.



OH!!!
Look who's talkin. You've had the same boots for as long as ive known you and I don't think you ever take them off.

Shit, my Stance socks are 20 dollars a pair!!! 8)
Sat Jan 18, 2014 3:22 am

Molto Verboso
Joined: 31 May 2009
Posts: 1221
Location: NC, USA
 
Molto Verboso
Joined: 31 May 2009
Posts: 1221
Location: NC, USA
Sat Jan 18, 2014 3:22 am linkquote
I would like to see the size of the holes in the casting behind the rotating selector in the fast flow types. In a stock tap, they are the major restrictions. Smaller than the fuel line fitting ID. So is the ON drain tube and the RESERVE drain hole.

I believe, as the video above showed, that the fast flows provide more fuel over time. But the experiment showed a non-typical largeframe setup. In the experiment, the fuel lines simply hang straight down for what appears to be at least a foot or more, emptying into a container.

A stock setup has the fuel line going down, coming out beside the cylinder, then curving back up to the banjo fitting. The actual vertical distance from the fuel tap outlet to the top of the banjo fitting is a few inches. That distance determines pressure seen at the needle/seat. Less pressure, less flow. Evidently not much more flow than necessary for stock.

Putting a bend in the fuel lines shown in the video, then raising the drain end to the same levels as installed would provide more useful flow rates for actual use.

Scootermarc69's experiment showing the percolating had me puzzled the first time I saw it. Then by putting a bend in the line as typical, and raising the drain end upwards, the percolating stopped. The only reason I could come up with for the vent tube is to provide atmospheric pressure directly to the fuel line at the tap exit.

If I was a large frame gas-guzzling abuser, possibly a hole in the side of the frame slightly lower than the tap exit, spin the banjo fitting upwards, along with an air box butchery would be tried. Getting rid of the SI step one.

No disputing from me that the aftermarket taps provide more flow, just how much more as installed.
Sat Jan 18, 2014 8:34 am

Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
 
Ossessionato
Joined: 24 Jan 2008
Posts: 2018
Location: Santa Margarita,Ca.
Sat Jan 18, 2014 8:34 am linkquote
Interesting Blackbart. So the gurgling I was getting is more a result of the a vacuum created by the siphon effect of having a long tube hanging down. Makes sense. On a small frame the fuel line should and does drop down without rising back up so maybe it's more of of an issue. I have heard a lot of other small is guys complaint of revs that take a while to settle, even on stock bikes.
Sat Jan 18, 2014 8:54 am

Addicted
SS208, SX250 , RD's and a K1300s and an RZ350 and TZR250
Joined: 30 Sep 2012
Posts: 567

 
Addicted
SS208, SX250 , RD's and a K1300s and an RZ350 and TZR250
Joined: 30 Sep 2012
Posts: 567

Sat Jan 18, 2014 8:54 am linkquote
I have the Lambretta version of the fast flow with the indicator light. All works beautifully, but the light as mounted (replaces one of the legshield bolts) can be difficult to notice and on a thirsty bike, does not give much warning. With the indicator light version, there isn't a reserve - the tap is either on or off. I am going to have to experiment to confirm this, but after the light goes on, my bike gets about 6 miles before empty. Not much warning and easy to find yourself pushing...
Sat Jan 18, 2014 9:35 am

Hooked
PX232 Lambretta li s3, Vespa cross, Vespa cross prototype, Honda NS400r....
Joined: 28 Dec 2012
Posts: 282
Location: Belgium
 
Hooked
PX232 Lambretta li s3, Vespa cross, Vespa cross prototype, Honda NS400r....
Joined: 28 Dec 2012
Posts: 282
Location: Belgium
Sat Jan 18, 2014 9:35 am linkquote
Ordered one yesterday, from LTH.
Will post some pics of the work on the engine.
Sara
Sat Jan 18, 2014 11:19 am

Ossessionato
'20 300GTS Super Tec '09 250 GTSie '75 Rally 200 '79 P200 '09 Stella 221
Joined: 13 May 2012
Posts: 2595
Location: Midway, Kentucky
 
Ossessionato
'20 300GTS Super Tec '09 250 GTSie '75 Rally 200 '79 P200 '09 Stella 221
Joined: 13 May 2012
Posts: 2595
Location: Midway, Kentucky
Sat Jan 18, 2014 11:19 am linkquote
Same here, placed an order with Mark@Scooter-Speed. He was in the process of building another order with SC and added this on. I'm in the process of building another scooter and glad I saw this thread.
Sat Jan 18, 2014 5:07 pm

Style Maven
'74 50s x3 '78 P200 E '84 Cosa '91 PK50XL2 '58 AllState '68 Sprint '80 50special and a '66(?) Super125
Joined: 22 Nov 2010
Posts: 8447
Location: seattle/athens
 
Style Maven
'74 50s x3 '78 P200 E '84 Cosa '91 PK50XL2 '58 AllState '68 Sprint '80 50special and a '66(?) Super125
Joined: 22 Nov 2010
Posts: 8447
Location: seattle/athens
Sat Jan 18, 2014 5:07 pm linkquote
blackbart wrote:
...

A stock setup has the fuel line going down, coming out beside the cylinder, then curving back up to the banjo fitting. The actual vertical distance from the fuel tap outlet to the top of the banjo fitting is a few inches. That distance determines pressure seen at the needle/seat. Less pressure, less flow. Evidently not much more flow than necessary for stock.

...
Wouldn't that pressure be determined by the level of the fuel in the tank? The higher the level, the greater the pressure? Now, I'm NOT saying this assures adequate FLOW at the higher pressure if the tap is restrictive or clogged.

My Cosa has a plastic tank with the outlet quite low and it won't run right when down to a quarter tank. Fill it up and it's fine. Probably some of the hose routing issues you mentioned and the lower pressure causing this. There's NO fuel tap, it has a solenoid shutoff valve at the carb.
Sat Jan 18, 2014 9:49 pm

Addicted
Joined: 01 Jan 2012
Posts: 629

 
Addicted
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Posts: 629

Sat Jan 18, 2014 9:49 pm linkquote
my stock taps would flow about 1/3 pints per min
the bgm fast flows I have on now flowed over a pint per min

I tested them

the only time I had a issue with gas flow was on my small frame after I
- fitted the bgm tap and didn't rebuild the gas cap lid / drill open the air holes a mm.
- upped the carb size
- ported the kit

When the tank was full no vacuum would occur due to greater fuel pressure but when I had a 1/3rd or lower tank of gas the carb would get starved of fuel even at an idle and engine would stop running (after racing a little).

When I opened the gas cap lid to see if I was out of fuel 100% the tank "popped" as it released the negative air pressure.

rebuilt the gas cap and opened up the air vent holes a mm and all was great..

check you vent holes if your upping the cc's and components
Sat Jan 18, 2014 11:54 pm

Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
 
Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
Sat Jan 18, 2014 11:54 pm linkquote
V oodoo wrote:
blackbart wrote:
...

A stock setup has the fuel line going down, coming out beside the cylinder, then curving back up to the banjo fitting. The actual vertical distance from the fuel tap outlet to the top of the banjo fitting is a few inches. That distance determines pressure seen at the needle/seat. Less pressure, less flow. Evidently not much more flow than necessary for stock.

...
Wouldn't that pressure be determined by the level of the fuel in the tank? The higher the level, the greater the pressure?
That's how I see it.

And when pressure is low at the needle/seat, it's even more important that there is no restrictions in fuel tap. I would say.

I opened the original fuel tap and surely canals are tiny. First I though if I could open up them a bit. Then I thought why bother.
Sun Jan 19, 2014 4:50 am

Molto Verboso
Joined: 31 May 2009
Posts: 1221
Location: NC, USA
 
Molto Verboso
Joined: 31 May 2009
Posts: 1221
Location: NC, USA
Sun Jan 19, 2014 4:50 am linkquote
[quote="Partanen"]
V oodoo wrote:
blackbart wrote:
...

A stock setup has the fuel line going down, coming out beside the cylinder, then curving back up to the banjo fitting. The actual vertical distance from the fuel tap outlet to the top of the banjo fitting is a few inches. That distance determines pressure seen at the needle/seat. Less pressure, less flow. Evidently not much more flow than necessary for stock.

...
Wouldn't that pressure be determined by the level of the fuel in the tank? The higher the level, the greater the pressure?
Duh, sorry about that. Even I get tired of typing. I look at minimum flow at near empty and just figure flow will be more with higher fuel levels.

I am still ignorant about the exact purpose of the tap vent tube. It's a problem (leak) waiting to happen. Broken, split, or not good seal where it's jammed into the tap body results in OFF still flowing. Vents are often used in drain systems, but not tied directly to the same outlet at the source (tank). It's the only gravity feed system I've seen that uses it.

The only thing I've noticed is that the vent tube allows fuel pressure in the line to drop to zero when you turn the tap to OFF and run the engine until it stops. Then, when you remove the banjo or fuel line, nothing comes out. Stuff I've messed with without the vent leave fuel in the line due to the top (tap outlet) being sealed off. Like reduced fuel flow with stopped up tank filler cap vents.

On a smallie, downhill run all the way, the fuel line should empty. A large frame will have fuel left in the sorta U-shaped trap below the banjo, but under no pressure.

After a split vent tube episode, I cut it off and soldered the end shut. Tested flow and basically the same, except for no percolating as described by scootermarc69. I used it for a few months before replacing.
Mon Jan 20, 2014 1:39 am

Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
 
Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
Mon Jan 20, 2014 1:39 am linkquote
What if ventilation tube is there to bleed the fuel line. When you stop hot engine some of the fuel in hose wants to evaporate because of the heat. Now vent tube allows the fumes to escape from fuel hose to the fuel tank.

Or then it prevents air locks in the fuel line and in the tap. In case if you inadvertently ride while fuel tap is closed.

When I get my "BGM" I would check if it could bleed itself. Internals of the tap could be organised differently than Piaggio's tap.

Edit: When ventilation pipe is open all the time it can release fumes to the fuel tank even when fuel tap is closed.

Last edited by Partanen on Mon Jan 20, 2014 3:09 am; edited 2 times in total
Mon Jan 20, 2014 2:44 am

Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
 
Molto Verboso
'74 Rally, '72 Sprint
Joined: 30 May 2013
Posts: 1147
Location: Melbourne, London, Durham NC
Mon Jan 20, 2014 2:44 am linkquote
There is one of these on scoot.net for all the US folks wanting one.
Mon Jan 20, 2014 9:29 am

Primasarah
1979 P200E, 1977 Rally 200, 1974 Primavera
Joined: 15 Mar 2011
Posts: 3087
Location: Lake Worth, FL
 
Primasarah
1979 P200E, 1977 Rally 200, 1974 Primavera
Joined: 15 Mar 2011
Posts: 3087
Location: Lake Worth, FL
Mon Jan 20, 2014 9:29 am linkquote
If anyone needs one, just let me know. I had a couple on the shelf.
Mon Jan 20, 2014 5:13 pm

Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
 
Mr. Clean
P,SUPER,V90, 50 Special
Joined: 27 Jul 2010
Posts: 10207
Location: This is't my locker!
Mon Jan 20, 2014 5:13 pm linkquote
There's this too on scoot.net:

http://scoot.net/classifieds/forsale.html?id=46632
Sun Jan 26, 2014 3:56 am

Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
 
Hooked
Joined: 24 Mar 2011
Posts: 495
Location: FI PKS
Sun Jan 26, 2014 3:56 am linkquote
No huge (but slight) differences between fuel canal dimensions. Main difference is that in BGM fuel tap fuel goes shorter route, and all the way downwards. In piaggio's tap fuel goes first down and then it goes up again before it leaves from the tap.

There's no easy way to improve Piaggio's tap flow.



BGM3030 Faster Flow fuel tap on left, Vespa's tap on right.

Do you agree that it's better use "res" position all the time? I think it gives more pressure to fuel line.
  DoubleGood Vespa Design  

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