I have a 1991 kawasaki KX 125 its had a new piston + rings the carb set, float set and also the needle. the timeing has also been set. i have brought a new racing spark plug wich produces a good strong spark. It starts ok but when riding it it pulls of then looses power its like when its suposed to hit the power band it gets bogged down and looses all power. the arm for the power band moves free and moves out then the bike is been reved in a staionary position. Can anyone Help.
Thanks Chris R (wolverhampton england)

chris roden, February 2009

Any one know where I can get exhaust valves for kx125 1991?
One of mine has snapped! Cheers

Lee Boi, November 2014

adjust the needle in the carb

keith, September 2010

hi it sounds like you may need new reeds or your exhaust valves may be broken or cracked. the same happened to me when i bought the same bike and i replaced the powervalves and it fixed the problem. it could also be that if you have a leak in the expansiaon chamber in the side of the cylinder causing loss of compression. i hope this solves your problem.

zak smith, May 2009

your tick over screw is to high turn it right in while it is running

dave, March 2009

you might need a new carb

dave, March 2009

Hi Your problem sounds like a fuel starvation problem, I'm not the best on two strokes but check the fuel tap is giving fuel through remember they have a vacuum pipe.(well they do on 4 stroke bikes) also check the read valves are letting fuel through.

Casper, February 2009