Lean Condition?

[lotoftoys]

I have 2000 ZR500 EFI that was not running well on the last ride of the season. Starts and idles fine but as soon as you start to pick up speed it will bog and then backfire then after a while run better than ever. I am afaraid if I keep running it/testing it I will be in for a burn down. Any ideas?

 

[snowbuff]

Seal(s)??? Boot(s)??? Bad compression??? Dirty throttle bodies??? Some places to start. Being EFI, thats where I would start.

 

[catman66]

check the slack in your throttle cable, this will affect the throttle position sensor and make it act that way. I got a 99 zl 600 efi and had the same symptoms. I tried everything people told me and it came down to there just being t much slack in the cable that would not allow the sensor to open all the way and send the correct signal back to the computor. Hope this helps, good luck