Originally Posted by
fyrstormer
Yeah, I'm considering a cooling fan, but the first order of business is to get the exhaust sorted out. Maybe I bent the flex pipe too much, or maybe I got unlucky and mine was defective. If it happens again I'll have to come up with a different solution; maybe some straight tubing held together with silicone bends, or something like that. I dunno yet.
I've got my engine geared-up pretty high, so I should be able to make use of the engine's massive torque to get good speed. Maybe I can get away with running it rich enough to not need a cooling fan, or maybe not.
These thumpers are tricky little bastards for sure. To rich and not enough rpm the clutch will fry. To much rpm and they become extremely hot. Silicone won't hold up to the exhaust temps, been there. Teflon was used by timjs but I think that also failed. Best bet is to thread and bend your own pipe. Of course iv had a exhaust port on the head break off with to much weight. I was out jumping the Crap of of it though.