OP
Sun, 17 Sep 2023 20:16:50 +0000

Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: Sat, 12 Sep 2015 22:45:15 +0000
Posts: 361
Location: Madtown
 
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: Sat, 12 Sep 2015 22:45:15 +0000
Posts: 361
Location: Madtown
Sun, 17 Sep 2023 20:16:50 +0000 quote
Hi all,

Long time away from the board. I am thinking of having a local machine shop bore out a spare si24/24e carb that I have to 26mm (and to drill the fuel supply hole to the main jet to 2mm).

I am not sure what it is called -- the brass tube in the carb throat -- spray bar, something like that? Anyway, how can that be removed? I grabbed it with some small needle nose pliers and pulled but it didn't budge and I was worried about squashing the tube.

Thoughts?
Mon, 18 Sep 2023 02:36:14 +0000

Nedminder
62 VBB1T Round Tail W/ leaner sidecar
Joined: Sat, 26 Jan 2019 09:50:15 +0000
Posts: 3840
Location: california
 
Nedminder
62 VBB1T Round Tail W/ leaner sidecar
Joined: Sat, 26 Jan 2019 09:50:15 +0000
Posts: 3840
Location: california
Mon, 18 Sep 2023 02:36:14 +0000 quote
Never thought about it, but…
as long as it wasn't put in before casting with some sort of positive geometry inside the carb - then I would expect heat would allow you to remove.

If me:
Torch on carb wall all around tube to get that area nicely hot.
Then see if you can wiggle out with pliers.

Other ideas:

Put a small steel rod (welding rod?) inside the tube first, to keep it from squishing and soak up some heat.

Use iced steel pliers so they cool off the tube when you grab it. Dunk em in ice water for 5 min.

Let us know how u make out.
Mon, 18 Sep 2023 09:10:44 +0000

Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: Sun, 02 Aug 2015 18:39:51 +0000
Posts: 3817
Location: Veria, Greece
 
Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: Sun, 02 Aug 2015 18:39:51 +0000
Posts: 3817
Location: Veria, Greece
Mon, 18 Sep 2023 09:10:44 +0000 quote
Nozzle is pressed in through the plugged hole marked in the photo. I don't know if it's worth the trouble than buying a new one…



Mon, 18 Sep 2023 13:59:37 +0000

Ossessionato
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: Sun, 17 Apr 2011 00:34:49 +0000
Posts: 2468
Location: Siam
 
Ossessionato
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: Sun, 17 Apr 2011 00:34:49 +0000
Posts: 2468
Location: Siam
Mon, 18 Sep 2023 13:59:37 +0000 quote
I wonder if it will work better after doing that.
Mon, 18 Sep 2023 14:38:01 +0000

Banned
3:5
Joined: Fri, 12 Jan 2007 02:38:46 +0000
Posts: 8740
Location: San Francisco
 
Banned
3:5
Joined: Fri, 12 Jan 2007 02:38:46 +0000
Posts: 8740
Location: San Francisco
Mon, 18 Sep 2023 14:38:01 +0000 quote
the new ones that are bored to 26 have some ridiculously thin sections to the point that the one I bought just sit's in a box, will not be installed.

I think the Vortex had tapers machined above and below the spray bar, and this seems like a much better idea.
OP
Tue, 19 Sep 2023 00:18:47 +0000

Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: Sat, 12 Sep 2015 22:45:15 +0000
Posts: 361
Location: Madtown
 
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: Sat, 12 Sep 2015 22:45:15 +0000
Posts: 361
Location: Madtown
Tue, 19 Sep 2023 00:18:47 +0000 quote
OK thanks for the tips. I'll not pursue this route. I'm trying to cure apparent two-stroking at 1/8 throttle on a Malossi 210 setup with an SI24 carb. I've got the standard setup, the bike runs great when the throttle is more opened, but I can't get the low-throttle part smooth. I'm running the standard 160-BE3-125-ish main jet stack and started with a 55/160 idle jet and played around with changing those, but can't get it perfect.

Now I see myself desperately looking at SIP's $40 slides, maybe that's the problem. Down the rabbit hole...
Tue, 19 Sep 2023 00:41:53 +0000

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: Fri, 21 Oct 2005 19:59:19 +0000
Posts: 13753
Location: The state of insanity, SoCal
 
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: Fri, 21 Oct 2005 19:59:19 +0000
Posts: 13753
Location: The state of insanity, SoCal
Tue, 19 Sep 2023 00:41:53 +0000 quote
oopsclunkthud wrote:
the new ones that are bored to 26 have some ridiculously thin sections to the point that the one I bought just sit's in a box, will not be installed.

I think the Vortex had tapers machined above and below the spray bar, and this seems like a much better idea.
the vortex had a bit of taper and some cut into and shortening of the spray bar. I don't have one any more to snap some pix, but that seems to be my recollection.
Tue, 19 Sep 2023 01:59:28 +0000

Hooked
Rally 180, TS 125, PX 150 and a lot of smallies
Joined: Sat, 19 Oct 2013 22:10:51 +0000
Posts: 104
Location: Paso
 
Hooked
Rally 180, TS 125, PX 150 and a lot of smallies
Joined: Sat, 19 Oct 2013 22:10:51 +0000
Posts: 104
Location: Paso
Tue, 19 Sep 2023 01:59:28 +0000 quote
T5 slides are richer. They have no cut out for air and it's cheaper.

https://www.sip-scootershop.com/en/product/throttle-slide-dell-orto-05_84920500
Tue, 19 Sep 2023 02:43:16 +0000

Hooked
'58 VBA
Joined: Wed, 25 Dec 2019 15:15:16 +0000
Posts: 343
Location: Chico CA
 
Hooked
'58 VBA
Joined: Wed, 25 Dec 2019 15:15:16 +0000
Posts: 343
Location: Chico CA
Tue, 19 Sep 2023 02:43:16 +0000 quote
Or plug off the oval hole above the slide.
Tue, 19 Sep 2023 04:07:15 +0000

Nedminder
62 VBB1T Round Tail W/ leaner sidecar
Joined: Sat, 26 Jan 2019 09:50:15 +0000
Posts: 3840
Location: california
 
Nedminder
62 VBB1T Round Tail W/ leaner sidecar
Joined: Sat, 26 Jan 2019 09:50:15 +0000
Posts: 3840
Location: california
Tue, 19 Sep 2023 04:07:15 +0000 quote
yackee wrote:
OK thanks for the tips. I'll not pursue this route. I'm trying to cure apparent two-stroking at 1/8 throttle on a Malossi 210 setup with an SI24 carb.
Your issue could be lean, could be rich.
That spot is a particularly tough place to knock out with performance engines and larger carbs.

You might find the 26 worse.
the suggestion above - to try a different slide - is not a bad one.
You could mock it up with some epoxy filling the dish in your current slide.
Or buy new.

Smaller throat carb would likely be easier to tune in that area - but may rob your top end.
Tue, 19 Sep 2023 16:43:05 +0000

Molto Verboso
Joined: Sun, 29 Nov 2020 21:32:23 +0000
Posts: 1550
Location: Los Angeles
 
Molto Verboso
Joined: Sun, 29 Nov 2020 21:32:23 +0000
Posts: 1550
Location: Los Angeles
Tue, 19 Sep 2023 16:43:05 +0000 quote
yackee wrote:
OK thanks for the tips. I'll not pursue this route. I'm trying to cure apparent two-stroking at 1/8 throttle on a Malossi 210 setup with an SI24 carb. I've got the standard setup, the bike runs great when the throttle is more opened, but I can't get the low-throttle part smooth. I'm running the standard 160-BE3-125-ish main jet stack and started with a 55/160 idle jet and played around with changing those, but can't get it perfect.

Now I see myself desperately looking at SIP's $40 slides, maybe that's the problem. Down the rabbit hole...
If you're looking at the Lemarxon slide, keep in mind it's part of a mixer + slide system.
X234 atomizer & LM-L slide should get you as close as you can to 1/8 smooth. If you want to chase that rabbit further down the hole, add the XX34 and LM-M.

You can find similar setups on this page. Click on the pics for each setup.
https://www.facebook.com/media/set/vanity=623198641104514&set=a.5323766011047730
Wed, 20 Sep 2023 01:26:50 +0000

Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: Tue, 07 Dec 2010 04:44:45 +0000
Posts: 3980
Location: Kingdom of Lanna
 
Ossessionato
LXV 150 3v ie. Midnight Blue (Sold) Now Honda Zoomer X
Joined: Tue, 07 Dec 2010 04:44:45 +0000
Posts: 3980
Location: Kingdom of Lanna
Wed, 20 Sep 2023 01:26:50 +0000 quote
yackee wrote:
I'm trying to cure apparent two-stroking at 1/8 throttle on a Malossi 210 setup with an SI24 carb.
Isn't a two-stroke supposed to two-stroke.

Can you avoid 1/8th by increasing the idle a bit?

Last edited by waspmike on Wed, 20 Sep 2023 14:25:16 +0000; edited 1 time
Wed, 20 Sep 2023 08:56:48 +0000

Addicted
Joined: Thu, 28 May 2020 18:20:07 +0000
Posts: 865
Location: Planet Earth
 
Addicted
Joined: Thu, 28 May 2020 18:20:07 +0000
Posts: 865
Location: Planet Earth
Wed, 20 Sep 2023 08:56:48 +0000 quote
the one eighth four stroking gurgle plagues us all. Ive given up trying, we've had so many posts on this on MV. Quite frankly, id rather know my scoot wasnt going to explode as most of the time I ride 3/4 to full throttle every day to work and back, scoot never misses a beat and spot on avoiding seize territory. Just dont run at 1/8 throttle, change your gear up, it improves slightly. I was also under the impression as to the rich lean question that slightly pulling your choke out answers that question, in my case it makes it worse hence I believe im rich on 1/8 and quite frankly i use my nose too, cause you can smell its rich pottering on 1/8th, run around the block a few times four stroking, cut your ignition and see your plug is quite wet/black, sight, sound and smell buddy and you know whats what IMO.
OP
Wed, 20 Sep 2023 14:12:56 +0000

Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: Sat, 12 Sep 2015 22:45:15 +0000
Posts: 361
Location: Madtown
 
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: Sat, 12 Sep 2015 22:45:15 +0000
Posts: 361
Location: Madtown
Wed, 20 Sep 2023 14:12:56 +0000 quote
Lemarxon slide and mixer tube ordered! Thanks for the tip. I'll post the results after it arrives and gets installed.
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