u didnt accidentally hook the tank vent into the airbox and the dpm sense line out the tank vent hole by chance. they will do some weird things if thats the case.
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You probably dont want to hear what I think it is I think the crank might be on its way out. Maybe a bearing. Mine did the same thing. How many miles?
Van Epps, Put in 360 mains,needles on 3,160/350 primary spring,15gms of total pin weight,clickers on 4,and fresh 91 octane fuel without any additives or race gas. Keep the 19/45 gearing. Start with this as a baseline. Watch your EGTs and rpms on the trail!Ran it today with 19.8 grams. Same problem. The only difference is the RPMs are now surging between 7600-7900 vs 7700-8000.
Wow Van Epps these revs are killin us!
Here's my latest rundown:
Fresh rebuilt motor popped with 285 miles. Took it apart mag piston popped destroyed the cylinder and head. Carnage fell into the also freshly rebuilt bottom so I took it apart also just to be sure it was OK. Found out the guy that rebuilt the bottom used the wrong bearings and now the crank is also pooched!
Still love riding this sled so decided a shortblock is the answer. Put it all back together still getting the bog 10% of the time. When it does'nt bog it's pulling 8100 rpm solid. Checked the plugs and they looked a little light so put 400 jets back in. Plugs look a little better now. Going to put the stock reed spacers and rave springs back in and will be 100% stock again. Find out this weekend if it gets better. Cleaned DPM again and checked/cleaned carbs again. This thing is killing me and my wallet!
Help!!