Maintenance & Technical > KX250 / KX125

kx250 prob after rebuild

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KawasakiRipper:
Hey guys Ive ahd this bad 98 kx250 for a year now, i just got cylinder done at millenium, new piston and rings, new crank seals and bearings, but ever since ive got it back, it doesnt have the top end power it used too. It still has tons of low end power but its just not as fast and wicked, im guessing its either the KIPS powervalve or a dirty carb. Please help me out guys let me know what you think, im trying to rip silver lake sand dunes for the fourth! thanks!

Foxx4Beaver:
though there are a few things it could be...
I would start with the KIPS, be sure they're opening/closing fully, and working correctly, if at all.
you can remove the plastic KIPS cover on the right side of the jug, start it up, and rev it a couple times to see if they're working. If the rod comes out when you rev it, you'll know they're working. Now you'll need to shut it down, remove the pipe, and look up into the exhaust port, and see if the side valves are fully closed...you can then manually pull on the rod easily on the side of the cylinder to see if they open fully.

Start with that, then report back.

KawasakiRipper:
Ok thanks Foxx, this cover is what your talking about right?

KawasakiRipper:
and also foxx when i look in into the exhaust port, i just give it throttle to see if its fully functioning? thanks

Foxx4Beaver:
correct.
what I explained shouldn't take you much more than 30 minutes to do.

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