motor holding back on full throttle

[gill vanderwerf]

when i go full throttle my engine revs down sometimes is that a mixture problem and should i lower or raise that needle in my carburetor?

 

[Oldbiscuit]

Could be multiple things causing that. I had the same issue on one of my bikes and after trying different jets and needle clip locations to no success , I went looking at the ignition. Mine turned out to be a weak coil. Ran good at low speeds but give it gas and it would bog down.

 

[Larry Trotter]

Try running with the choke on a little bit and see if there’s any difference.

 

[Testname111]

What exhaust are u using,

 

[Testname111]

F2 thruster by any chance or expansion chamber?

 

[Nightster]

F2 thruster by any chance or expansion chamber?

Does the F2 thruster have issues, I bought one for a future build.

 

[Testname111]

Ehh I don't know yet its hard to tell with all the added weight I have on my build,I like this exhaust because it keeps my bottom-end clean, beyond that I think u have to get used to it

 

[Testname111]

Try the BikeBerry stage 1 CDI with a BikeBerry magneto coil..... those lousy Chinese stock coils blow

 

[gill vanderwerf]

i set my needle to a leaner mix and its running better but still have a bog down sometimes

 

[Nightster]

i set my needle to a leaner mix and its running better but still have a bog down sometimes

At least you made some progress. Maybe some others have an idea of how to tweak it a little more