Oldymf

Are you getting fuel to the plug? If so, have you checked for fuel in the oil. I have seen fresh rebuilds have fuel wash down the cylinder walls and keep you from starting the bike. I have even had it happen to an old Dodge truck. The more you try to start it, the more fuel you get in the crank case.

It could be a loose or breaking ground. They can be like chasing a ghost. Just check them all. Look for dry rotted cashing.

Have you checked all of your grounds ? I would look for loose, dirty, or even cracked wires that could have corrosion inside.

Hello all!

   I am new to the page and this is my first post. If I get things screwed up, just verbally slap me, and tell me what to do.

   I have an 87 Moto4 350 that I bought as a project 2 years ago. I have stripped it down and scrubbed all the Mississippi mud out of it and have put it back together and am beginning the process of trying to get it running. I have fixed many things on it, but have stumbled on the fact that it has weak spark. Just want to hear what I should check first and how. Thanks in advance!