Yamaha yfz 450 throttle problem

[zookeeper]

Does your problem happen when you're riding the bike, or when you just whack the throttle while it's in neutral? You have the same jetting I have (I'm at seal level) and mine is very crisp when riding, but will hesitate when I whack the throttle in neutral.

[BMW doc]

Does your problem happen when you're riding the bike, or when you just whack the throttle while it's in neutral? You have the same jetting I have (I'm at seal level) and mine is very crisp when riding, but will hesitate when I whack the throttle in neutral.

Mine does it all the time when in neutral, but that doesn't bother me. But when I am cruising around slow in first gear with the clutch released/engaged.....I can sometimes stab it and it will fall on its face. Like I've said previously, I can certainly learn to ride around this, but I'd rather do what I can to improve it in case there is ever that critical time I need it to be fixed.

[giesdog]

the power bowl is made with an adjustable leak screw, you might also have fubard the throttle position sensor when messing with the carb, i have never done this but have seen a lot of other forums with same problem and the tps was the cause. dealer can fix it i think.

[k_dub72]

this is a common problem with yfzs. Look up "carb modd" you can do this in addition to the "cam modd" it with get rid of the stalling.

[Sadowski21]

will the yfz benfit from unpluging the tps cause i know sparks offers a tps block off

[Myersracing41]

will the yfz benfit from unpluging the tps cause i know sparks offers a tps block off

I bought the Sparks TPS bypass and honestly I wouldn't bother. I saw no difference whatsoever. I took it off the week of Thanksgiving and we went to Durhamtown that Monday and although I've learned to roll the throttle it actually seemed better without the bypass. I did notice that later in the day as I grew tired I started stabbing the throttle way to hard and it got scary at times on some of the bigger jumps using the throttle to correct myself in the air, but I am a rookie.

I've read alot about the issue from above and it has something to do with the AP adjustment and some have changed the leak jet to a smaller size. I honestly don't know if these adjusments help I've just read some posts on other sites and they seem to all push to this area.