Cal Schreyer
Dumas
Super dumb question..you're checking for vacuum at the breather hole, but have you checked the breather itself?
I have had similar things happen, and it's always a clogged breather
Not such a dumb question....It has a factory?? chrome air cleaner and breather. I checked the breather with good old lip pressure and didn't get much through it so I blew in with 60psi compressed air and the foam filter blew out. There was an incredible amount of foam packed in that breather, I will try another breather....Hey, it's possible....this problem has to be coming from something simple