tuning problems lazy off bottom

[stauffracing#4]

bike does not seem to pull like the other racers any more? just put new piston and ring . thanks for any help.

[hotquads1]

which bike? how is it equipped ? need more info and symptoms.
marc

[Logan #34's Dad]

Any number of things, First thing I'd try is a new torque spring (big spring). Then rollers, then belt.

[markvette]

check compression, even though you put in a new piston and rings you could still be low on compression. the cylinders wear out pretty quick on these little 2 strokes.

Mark

[drr5]

did you run a hone through it? did it show wear as if it may have been sanded? but sounds like tourqe spring to me, are you using a stock spring?and i have found that under hard race conditions the frc clutch starts to go away, the clutches are good but they dont last forever

[bulldogfallon]

When did the symptons occur?

Before the rebuild or after?

[stauffracing#4]

sorry guys. the bike is stock all the way. its a 90 by the way. the problem started before the rebuild.it had 130 before rebuild havent check it after.sorry guys i do have the high compression head.it came with the oko carb.

[hotquads1]

if you have the Hi comp head , the 130 would be very low , check the compression now and let us know, you may have damaged a ring during install. were cyl walls clean and smooth? and is bike running clean just low on power? what does plug readings look like?
marc

[bulldogfallon]

What method are you using to test compression?

130 PSI seems low for your set up. I would think 160-165 would be expected.

Have you had Mike look at it yet?


I need your address for the shock you wanted.