I have a ZX10 2004 and my bike back fires when i let off the throttle at 3500 rpm I had the bolts tighend on the heads because they were loose the plug were changer. and i just dont get it. I have a stock pipe on the bike. I can hear the valves when i ride for a while dont know if the norm. any tip on what it might be I even changed the airfilter. I think that i did all there is to do. The bike only has 3700 miles on it.

 

Have the rack/tb's been removed? 3700 miles is nothing, but not sure why the head bolts had to be retorqued.

 

this is going to sound dumb but what is the "rack/tb's "? I dont know much about bikes im learning as i go along here lol. I dont have a clue why the bolts had to be tightend i had to that done at a dealer ship. I had also tightend the exhaust bolts they were lose also.

 

the rack/tb's is the throttle body rack where all the throttle control happens. they house the butterflies for the throttle and choke

is your servo under your set woking for the exhaust valve?

should cycle open and closed when you turn the key on..

welcome to KF!

 

yes the servo workes when i turn the key on. There has been a couple of time where nothing would work the bike would just keep trying to start but wouldnt. I would like to thank both of you for helping me out with some sugestions..

 

Thanks wh for the detailed follow up.
If there are no mods done, then I would be checking my CCT (cam chain tensioner) next. Could be running too loose and affecting the timing.

edit: CCT adjustment quick check- I place my 06 10r in 5th gear, pop the clutch while you are pulling the bike backwards a few times. The stock auto adjustable CCT's are not the best at times.

 

ok i will give that a try. I had the head cover off to do a seal and everything seemed fine but i will def. try what you said about poping it in fith gear. thank you i will let you know how i make out

 

hey guys I dont know if what your telling me to do is going to wok but i havent been able to give it a try. I would like to and i am eger to do so but i got hurt at work and i cant even sit on the bike.. This sux want to ride bad my neck goes numd and back is killing me so when i am able to get a friend over here to try it i will let you guys know. Thank you for your input on what i can try to do.

 

take it easy and heal up. That will leave a cringe ie neck and back issues.

 

Good luck with the fix Bro! Let us know how it comes out!