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VMC 177

Posted: Thu May 21, 2020 9:38 am
by brynt

I have a Px125 engine that I would like to get a little more performance from, has anyone any experience with the VMC 177 kit?

I am think of using it with a si24, polini box exhasut and a banded cosa clutch. Does that sound good?



Re: VMC 177

Posted: Sat May 23, 2020 6:50 pm
by gaz_powell
Didn't know anything about these kits but they look decent, one is entry level cast iron then an alloy/nicosil
I would expect similar performance to a polini or DR, without casing porting work.
I would nt worry about about banding the clutch ( what years is year bike, as it maybe cosa type already which will be adaquate.
I would use the standard carb upjetted before you try a 24mm.
Fit a fast flow tap and there are some simple float bowl alterations which will help.
I've not used the polini box pipe (only SIP R2 and now 3), I was toying with one as read good things but went SIP R3

It will give definaytely give you a bit more, you may need to change the gearing.

Good luck and keep us update

Re: VMC 177

Posted: Sat May 23, 2020 10:15 pm
by brynt
It's from 1987, it has the old 6 spring clutch, so worth replacing with a cosa clutch but no need for a banded basket. I'm happy to alter the standard carb and spend the money on a fastflow tap. I'm interested in what you think for gearing, I was thinking 22 clutch with the 68 primary?

Re: VMC 177

Posted: Mon May 25, 2020 4:11 am
by Muttley McLadd
Are you taking the whole thing to bits? It would benefit from matching it all up.

Re: VMC 177

Posted: Mon May 25, 2020 7:50 am
by brynt
The engine is not in the scooter so I intend to do a complete rebuild.

Re: VMC 177

Posted: Mon May 25, 2020 11:26 am
by tony172
22 clutch might be overkill, go 21

Re: VMC 177

Posted: Mon May 25, 2020 12:15 pm
by brynt
ok thank you