Pamco electronic ignition I swear by this because I was having the same type of problem. after installing electronic ignition I never looked back. The bikes running brand new... always a good Idea to check your coils
Do a compression check, Check Spark plugs, Check plug wires for being cross, check coil ground, check for clean carbs, check fuel flow, and check for vacuum leaks and airbox is not blocked
my bike threw a rod bearing on #3 piston rod, took the head off, took the cylinder sleeve off , my question is first- can i replace the bearing without taking the motor out and splitting the crank case and second question is can I reuse the piston rod and bolts