Friends bike she asked me to look at, 13k miles 08 ninja 250r. No power on full throttle and some odd backfires here and there.
Sat for 2-3 months, ran like junk, new gas still ran bad.
I pulled the carbs and cleaned them, cleaned primary jets, secondaries and the bowls and upper area spraying it all down.
Still runs poorly
I noticed the petcock was puking in the "on" position, so i stretched the spring like I did on my bike 4-5 years ago (see
https://www.ninjette.org/forums/showthread.php?t=141972). Fuel stopped puking but still have no power under full throttle, I have power to about 50-60% throttle then its gone.
Any other ideas would be helpful. I think I will replace the petcock first and diagnose from there its just a bummer its like $93 bucks now, unless anyone knows of a good rebuild kit or a good aftermarket one.
ninja 250.jpg