Sebastian Bluecrew
Member
Current build......
1995 XP 720, Bored 1.5mm, Pro-X pistons, Factory Performance Pipe without ECWI, dual 40mm carbs 140/75 jets, 40-ish pop-off, stock airbox. Motor is complete rebuilt all new gaskets and orings. Compression 150psi both cylinders. Rotary valve timed exact.
Skip the grey fuel lines and carb rebuild answers. It has all been done. And we went through the carbs multiple times. They are spotless.
Runs great on trailer, no high speed or WOT after 4000 rpm in the water under a load. Will stand up when you stab it from an idle then falls on its face.
PLug chop indicates it is light brown color, but not wet.
So I tried adjusting the high speed screw from 1/4 open to 2 full turns open. Made no difference at all. Should I go up on the jet to a 142.5 or a 145? Or am I missing something. I know it is lean because if I hit the primer while holding the throttle it will jump for a second then fall on it's face again.
1995 XP 720, Bored 1.5mm, Pro-X pistons, Factory Performance Pipe without ECWI, dual 40mm carbs 140/75 jets, 40-ish pop-off, stock airbox. Motor is complete rebuilt all new gaskets and orings. Compression 150psi both cylinders. Rotary valve timed exact.
Skip the grey fuel lines and carb rebuild answers. It has all been done. And we went through the carbs multiple times. They are spotless.
Runs great on trailer, no high speed or WOT after 4000 rpm in the water under a load. Will stand up when you stab it from an idle then falls on its face.
PLug chop indicates it is light brown color, but not wet.
So I tried adjusting the high speed screw from 1/4 open to 2 full turns open. Made no difference at all. Should I go up on the jet to a 142.5 or a 145? Or am I missing something. I know it is lean because if I hit the primer while holding the throttle it will jump for a second then fall on it's face again.