1984 vf750f rear cylinder firing problems

Hey there i just complete my project , the bike was running perfect before in the winter with an auxiliary fuel tank got my tank sealed built the bike back up. And know doesnt run good at all. At first thought it was a fuel problem or even the carbs. So I took everything a apart
but everything is good. So i decided to do some more testing, to reaslize the rear cylinders arent firing properly remove plug wires and no change in engine at all swithced cdi module everything imaginalbe i tried. But then i switch the coil for 1-3 andplug it up to 2-4 coil evertything works. MY problem is weak fire for the rear cylinder i was wondering if the pulse generator could just die out of no where anywayse hope somebody can help me :biggrin:

Thanks steve

 

does anybody ever encountered this problem

thanks stevet

 

Do you own a meter and a service manual?

 

Test pulse generator coils for proper resistance at the plug connector.

 

everything is good even change the plug wires same thing