Only 4500 RPMs

[Skools Out]

those motors the carbs don't open wide open butterflies they go 3/4 factory not sure the reason just letting you know.

[Joker2]

Thanks guys, I will check it out.

[Joker2]

I did check the cable without the engine running, when the throttle was all the way down, I was able to move the linkage at the engine a little ( 1/4" ) more by hand, I don't know what that will translate to as far as getting more RPM's.

[Skools Out]

that's how the 150 and 175 OP came from the factory. have you torn the carbs apart and cleaned?

[Joker2]

The carbs were just done with the rebuild