Put a 5hp back together. ARC billet rod, new rings, shaved the brows and cleaned up the porting. Valves are lapped in. Running a Briggs downdraft carb. Governor is removed. Going to order a ARC flywheel this week. When I run the bike towards the end of its revving limits, I let off the gas I get a rumble, gargle, backfire? I assume the valves are floating?? I am running stock valve springs.
What is the right fix for this or is this the norm? If heavier valve spring are the answer, what weight??
Any help is appreciated.
What is the right fix for this or is this the norm? If heavier valve spring are the answer, what weight??
Any help is appreciated.