eton cylinder question

[headache]

hey will an eton or polaris 90 cylinder bolt right on to a 50 lower end? I've been told that it should but was wanting some more opinions before i try it. i'm wanting to upgrade my daughters quad to a 90 and use the 90 carb and exhaust and all to give it some more power.

[chunky0071]

it should bolt up but you will not have the right stroke to run it go with a good 70 air cooled kit and let it ride!

[mmsoup]

Stroke will be off

I believe the 50cc is a 40mm bore and 39.2mm stroke

The 90 is a 52mm bore and 42mm stroke

The 50 cases make excellent power when you mount a 90 cylinder but you will need to bore the cases to accept the crank webs, and you will need to open them up to accept the cylinder skirts.

That's a lot of work........and it is easier to get a used 90 or some used cases or even a new set of cases and a new crank.

Good luck, we have been playing this game for 5 years and this will be our last. My suggestion would be to invest in a Cobra if you want to race and have teach shifting skills. Maintenance and a good understanding of 2 stroke tuning are a must though. Teach them early how to ride a shifter and they will be ahead of the curve.

If you want fewer headaches go to a Yamaha 125 as long as you aren't in NC.

We run fully modded 90 CVT's and our oldest daughter took a step back when moving up due to needing more seat time on a shifter

[Adrian Powell]

ive got 103 cc motor and pipe will sell 1000.00

[headache]

thanks guys. i forgot that the stroke is longer on the 90s. i may just buy her an older honda 125 or 200 quad, or maybe a breeze if i can find somethin cheap enuf. we arent racing this quad, just normal trail riding.