yms 28mm pipe. whats your opinion? anyone running it?

[89hatcher]

whats your opinion in the yms 28mm? also what rpm does it make peak performance?

[johnny248]

Not a good answer, but I *think* I remember that this is a decent midrange pipe, but by no means a "race" pipe. I think that 1man8scoots might have some info on it.

[Downsouthdio]

Its nice for a contessa or a cast malossi..i think it peaks around 9k ,1man or graphite9 can give more info

[Wheelman-111]

Greetings:

I called it my Hot Surfaces pipe because of the Lawyer Labelling. Anyone who can't anticipate that an exhaust pipe will be dangerously hot shouldn't be operating a motor vehicle. Or scissors. As South said, it peaks around 9K with great torque and near-stock noise levels. It's a good choice for Sport City riding, and durable.

[1man8scoots]

9k is pushing the power ceiling. The 28mm is for 50mm low revving bores, the 26mm is for 72cc low revvers, 30mm is for mini stroker 86cc+ low revvers. They don't fall apart as bad or quickly as a pg. They make a lot of grunt down low then taper off after 8k.

[1man8scoots]

Yms is a good company.

[89hatcher]

9k is pushing the power ceiling. The 28mm is for 50mm low revving bores, the 26mm is for 72cc low revvers, 30mm is for mini stroker 86cc+ low revvers. They don't fall apart as bad or quickly as a pg. They make a lot of grunt down low then taper off after 8k.

So the 28mm is for the bores smaller than 72cc? And the 26mm is for 72cc-85cc?

[1man8scoots]

50mm = 81.25cc.

[89hatcher]

50mm = 81.25cc.

Oh i c. Thanks I think I got to grab the 26mm cause I have the 28mm on my 72cc and my top speed so far has been 56mph. Wonder if I put on the 26mm it will make a difference on my top speed.

[superfast1234]

Try changing your gear ratio.

[1man8scoots]

Try changing your gear ratio.

Solid advice there. Top speed is relative to power vs rpm and gearing. If the 26mm gives you more rpms then you will gain speed.

[89hatcher]

i would say good pipe for stock bore, or cast. THe contessa seems like more of an aggressive bore vs the cast. You may rev to 9k with that pipe, but I bet your going to see peak power at 6-7500, then losing power 8k, hitting 9k if your lucky. Don't expect high rpm's or power, that being said its probably a great fit for mild builds, and low noise levels.

which pipe would you recommend using that would be able to rev and something that isn't too loud.