I have a 1967 Kawasaki C2SS and it is not reaching high rpms, it bogs out well before.
The manual calls for a 150 main, mikuni hex. but that jet is mega rich, I found someone else with the same bike and he is running a 120 main with no issues.
SO I tried a 120 and it would still just fall on its face. Currently I am down to a 100 main and the needle clip full lean and it is still way to rich.
I feel like I have another issue somewhere.
So I checked my compression and I was getting 120, but my gauge wasn't sealing well so I assume it is higher.
I installed new points and condenser timing is set, i noticed it runs a bit better if I set it a hair advanced.
I did a plug chop and the plug was dark grey.
The weird thing is when the bike starts to bog out it doesn't matter if I'm half throttle or full it does it no matter what.
The only thing I could think of is I had two head gaskets installed because one alone wasn't sealing, I measured the thickness of the head gaskets together and it was 1.66mm the manual says after the gaskets are crushed it should be 1mm, so that tells me that my squish area is .66mm larger then it should be, which would lower compression but I don't think it would cause the issues I'm having.
The bike has a oil pump to supply out so I don't have to pre mix, the pump is set by the book and it doesn't seem to be getting excess oil until it bogs out and it can't burn the oil any more.
Im sorry for the long post but I tried to get everything in here.
It is almost acting like the points are floating but they are brand new, BTW I did try another ignition coil and it did help it a little but not much (edited)