need help!!!

ok I bought my quad used so I dono what has been done to it as far as jetting but here are my symptoms.

Backfires on decel and when I am in 2nd cruising and I nail it to ride a wheelie, it just bogs down and putts. Anytime I nail it, it just bogs down it will never just rev I have to ease into it.

I just got the cam mod done yesterday (at a performance shop that knows what there doing) and now the quad is a bit hard to start up, I used to be able to start it with no choke or anything first push of the button. now I have to hold the button and feed it gas. I can feel a big increse in power tho.

opinions?


Cam Mod, New Piston 13:1 compression, hot rod crank, Intake and Exhaust.

 

thats weird man usually only 2 strokes do that kinda stuff when there not warmed up enough

but if you got titanium vavles the coatin could be comin off so just go get thos checked out n id recomend kibblewhite stainless steal vavles.

did you break it in with paddle tires? that could screw with your engine to

 

The FCR carb will stumble if you go from a closed/mostly closed throttle position to WOT to quick. There are a number of products out that will fix this, Boyeson powershot and a few clones. One company has a whole new float bowl!! This may or not be your problem, but it does help. Also, the cam mod will cause harder starting, more so with the higher comp piston since the auto decomp feature of the stock cam is not in the proper place anymore. If you like the power, you could always upgrade to the stock YZ450F cam, as they have the same timing as the cam mod, but the auto decomp works properly. You should also adjust your fuel screw with the cam mod, might need to go up one size on the pilot also. The popping on decel is a lean condition, just know that a properly tuned engine WILL pop a little on decel. You would have to go over rich to jet that out completely.

 

whats your jet sizes now?