tree monkey
Mastermind Approved!

He is....
Yep but it needed a new clutch!Top 3 Best one yet
Only one I've built
Wonder if Frank is going to the buildoff this fall???
How boutcha!!!
I didn't advance it as much as the 7900's. That whole unclocked crankshaft thing was in my mind. It's got about 3/8" of movement at the perimeter of the flywheel. Maybe 6°. The blue one is 10-12°Look great bud.
Sounds like you advanced the timing about .01 off the key on the 681. They can’t handle much advance
Mine popped with it just barely advanced. Ran good but drove me nutsI didn't advance it as much as the 7900's. That whole unclocked crankshaft thing was in my mind. It's got about 3/8" of movement at the perimeter of the flywheel. Maybe 6°. The blue one is 10-12°
I had it tuned a little bit too rich even with the extra load. I think the blue one was ahead by a couple seconds but it was tuned better too. I bet the solo picks up the difference if it was a hair leaner. 7910 is a brand new cylinder, 681 has a new Caber in it. Both have about 1 tank of fuel on themMine popped with it just barely advanced. Ran good but drove me nuts