Advice on PX125 kit
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Lurker
Vespa PX125
Joined: 19 Feb 2021
Posts: 2
Location: Kendal
Fri Feb 19, 2021 10:56 am quote
Hi all,
Just looking for some advice. I have a PX125 2006 model with electric start.
I would like to get a conversion to a 175cc but am bewildered about which type of kit and also If I then need a new 30mm carb / exhaust etc....
What would be the best combination in your expert opinions?
Thanks in advance.
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3878
Location: Oceanside, CA
Fri Feb 19, 2021 11:17 am quote
Can a moderator move this to the NSM section?

Theres a ton of bolt on 177 kits which will work great. Check out Pinasco 177, Malossi 177 or Pinasco 177. If you want to get the full power out of each you should machine the cases to match the cylinder transfers but I didnt, and its still 92% as much power as it could have.

Youíll want to change the clutch cog center to a 22-23 tooth. You probably have a 20 or 21 tooth currently.

Last would be an exhaust that breathes better. Check out the SIP Road 2.0 or the Polini box if youre going for the stealth look without an obnoxious sound. If you want to say fuck you to the neighbors and have a neck snapping pipe, youíll want to go full expansion pipe and SIP or PM tuning make good ones.

You can keep the electric start and the current carburetor. Youíll need new jets though. Also need a new air filter. The smaller blue filter elements choke down things a bit too much.

Will you be turning a wrench or will this be subbed out to a shop?
Molto Verboso
Joined: 03 Nov 2011
Posts: 1172
Location: Racing Capital of the World
Fri Feb 19, 2021 4:18 pm quote
VMC 177. The best small block kit in the market. Combine this with a 24si and BOX style exhaust.

7CE6E301-F599-4162-A575-805B9B1CC788.jpeg

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 8493
Location: The state of insanity, SoCal
Fri Feb 19, 2021 4:29 pm quote
suddenly my pants are a little tight. i think i may need a moment alone...
Molto Verboso
2007 Stella 225
Joined: 02 Nov 2019
Posts: 1442
Location: Rochester, Minnesota
Fri Feb 19, 2021 5:31 pm quote
greasy125 wrote:
suddenly my pants are a little tight. i think i may need a moment alone...
Women don't get it, I was laughing and my wife said "what?", I said I was laughing at scooter porn.
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 8493
Location: The state of insanity, SoCal
Fri Feb 19, 2021 6:32 pm quote
Christopher_55934 wrote:
greasy125 wrote:
suddenly my pants are a little tight. i think i may need a moment alone...
Women don't get it, I was laughing and my wife said "what?", I said I was laughing at scooter porn.
they do... it's just like, at a totally different wavelength.

it's a long story, so bear with me here...

i'd done some work on tractor for a local farmer. pay was rate, but then he kicked the pot with some pork chops. organic. well fed. beautiful, 2" mother fuggin' big beautiful boys.

so i roll home and i'm unwrapping these bad boys and my old lady loses her mind. WTF are those?!?? chops. WTF are you gonna do with them? well... i was gonna marinate them and then butterfly them, pan sear, then stuff them with some cornbread stuffing.

eyes got wide. there was noises.

so how long do those take to marinate?

about 30min or so...

so we have time to do stuff then?

yes. yes we do.

then, the other day i saw a bike up for sale and i was all: check this shit out. this is titties! omfg! wayyy out of my price range buy holy fuck balls.

she was all: you are a fucking nerd ass nerd. rubbs my feets if you're gonna be this weird.

somehow and for some reason, they don't kill us in our sleep.

-g

ps- the chops were awesome.
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1602
Location: UK (South East)
Sat Feb 20, 2021 1:17 am quote
GickSpeed wrote:
VMC 177. The best small block kit in the market. Combine this with a 24si and BOX style exhaust.
@Mr Gick, are you using 57mm or 60mm stroke cranks when you build with the VMC kits? If 57mm, how are you finding the power delivery?
Molto Verboso
Joined: 03 Nov 2011
Posts: 1172
Location: Racing Capital of the World
Sat Feb 20, 2021 6:16 am quote
swa45 wrote:
GickSpeed wrote:
VMC 177. The best small block kit in the market. Combine this with a 24si and BOX style exhaust.
@Mr Gick, are you using 57mm or 60mm stroke cranks when you build with the VMC kits? If 57mm, how are you finding the power delivery?
57mm crankshafts. You can build them with 60mm and VMC offers gaskets to match.

The butt dyno says yes, yes this is good. There are real dyno results out there, just do a little searching around.

Design and finish is fantastic. I love the heads which allow room for a CHT Guage to be install with no jacking around with them. The exhaust port at the exhaust header is bolted on (steel); out the head and exhaust port use an O-ring. Heads use 8 bolts to secure.

Just remember, it is not plug & play. You will have to TIG weld your cases and you may have to mill the gasket surface.

I will be onto my 4th VMC 177 build this week. A set of cases sent out to me from California with not-so-great porting and even worse JB WELD use. Guess thatís why they are sending them to me to get them right.

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Lurker
Vespa PX125
Joined: 19 Feb 2021
Posts: 2
Location: Kendal
Sat Feb 20, 2021 10:57 am quote
Thanks all much appreciated! I will probably Sub this out to a garage!!
Member
VBA
Joined: 12 Mar 2018
Posts: 39
Location: Texas
Tue Feb 23, 2021 3:13 pm quote
Kendalwhite wrote:
Thanks all much appreciated! I will probably Sub this out to a garage!!
What Gick is doing is higher end builds that are not plug and play. Work from people like him is more Vespa specific vs a general garage may throw parts on and not understand some of the nuance.

There are options out there like mentioned by MJRally that can be bolt on. I suggest you establish what you want out of the build and go from there. At a certain point in power the stock clutch will become unhappy. There will be a power limit with stock intake duration as well. I don't see a need to go for a 30mm carb.

@Gickspeed, why puts the VMC 177 over the Malossi 177 MHR (57mm kit)? Do you rock a shroud over the cylinder for cooling or is it designed to not need one?
Molto Verboso
Joined: 03 Nov 2011
Posts: 1172
Location: Racing Capital of the World
Tue Feb 23, 2021 4:20 pm quote
Captcha wrote:
Kendalwhite wrote:
Thanks all much appreciated! I will probably Sub this out to a garage!!
What Gick is doing is higher end builds that are not plug and play. Work from people like him is more Vespa specific vs a general garage may throw parts on and not understand some of the nuance.

There are options out there like mentioned by MJRally that can be bolt on. I suggest you establish what you want out of the build and go from there. At a certain point in power the stock clutch will become unhappy. There will be a power limit with stock intake duration as well. I don't see a need to go for a 30mm carb.

@Gickspeed, why puts the VMC 177 over the Malossi 177 MHR (57mm kit)? Do you rock a shroud over the cylinder for cooling or is it designed to not need one?
Both cylinders, Malossi and VMC, are fantastic. you will not go wrong either way.

now that is out-of-the-way, why i like the VMC 177:

-Centralized spark plug in the cylinder head
-4 cylinder head studs as well as another 4 allen screws gives you 8 points of contact on the head. real nice.
-The cylinder head is not stepped down in the cylinder, this allows for a head gasket if needed. but i don't think the Malossi is either. just better this way for adjustment.
-Cylinder head is machined in a way that allows you to install a CHT gauge under the plug and you don't have to mess around with bending it.
-Cylinder is machined on the spigot so running a longstroke crankshaft does not interfere with the cylinder.
-VMC is $80 cheaper than the Malossi- $347 vs. $427

I believe either cylinder you would have to TIG weld the cases to do the porting correctly. i generally see crap porting when this is not done as they don't want to break through the walls-and i get that. IF you cannot TIG weld, take it to someone that does, it's well worth it in the end.

simply my observations, but you cannot go wrong with either.

Now, i don't really think they are high end builds-certainly a higher quality. i'm still running Si carbs and a BOX exhaust. nothing super crazy like that, just user friendly equipment.

hope that helps. my 2 cents.
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