Is that a replacement ATU and advance rod from MikesXS? If so, I think there have been issues with the advance rod, with it being a little too short.
Yikes! That’s not good.
Is that a replacement ATU and advance rod from MikesXS? If so, I think there have been issues with the advance rod, with it being a little too short.
Is that a replacement ATU and advance rod from MikesXS? If so, I think there have been issues with the advance rod, with it being a little too short.
Obviously, the length of the parts (cam, advance rod) hasn't changed. If they fit fine before the only thing that comes to mind is the advance and points housings aren't mounted in tight enough. That could happen if you didn't seat the bearings in all the way on the cam. They must be slid in as far as they'll go. I know it looks kinda wrong because then they hang off the inside of their bore in the case, but that's how they need to be or the points/advance housings won't fit in tight enough .....
The little black bits on the advance side may be from the unit rubbing on the oil seal.
You should be able to tap them in by just loosening all the fasteners on top of the head. Keep in mind that they both need to be set in the same amount so the cam is centered, so measure and compare the inset side to side .....
I'm not sure what you mean by "bearing support lobe". I'm surprised you didn't have big oil leaks from behind the advance and points housings since they weren't seated in far enough. There's a gasket and o-ring back there but the housing would need to be tight up against the head for them to work and seal properly.
Was the valve cracked after all??
You might have a carb problem, as in bad diaphragms. They may have small holes in them so the slides won't lift all the way. The bike will only go so fast and the motor won't rev into the higher RPMs.
If your timing was badly off, it won't start easy like it does. It might be off a few degrees but that shouldn't stop it from revving up into the higher RPMs.
In your rebuild description, you made no mention of what you did to the cylinders and rings, if anything. Did you check for excess wear by measuring piston diameters, bores, and ring end gaps? Did you install new rings and hone the cylinders? Your compression numbers seem a bit low but may come up some after putting a few miles on. But, on the ones I hone and replace rings, the compression is usually better, right around 150, right from the start. That's considered the normal, good value for this motor.
What ignition? Check that you have proper advance action with a timing light.
Run a battery or you'll cook that Pamco.
Check your advance action with a timing light.