okay, I got a 96 foreman 400, bone stock minus the car tires I have on it. (HAHAHA)
I'll be driving along in 5th at about half throttle when all of a sudden it will lose power like it's bogging out, and I can hear a loud hissing coming from the exhaust. three times it's gotten so bad that even in second, wide open, it will barely move on a smooth road. then randomly it will regain power and run fine for a little while, then do it again.
I did a compression test and got 160 pounds right now, and re-lashed the valves at .005 intake, .006 exhaust, as the book says, and it still does it. any ideas? sticky exhaust valve maybe?
we got the bike about a year ago from my dad's buddy, where it sat for four years. before that it was owned by a mining company that used it in the bush. it had a broken shifter and was stuck in first when we got it, and when dad's buddy got it.
I thought being a mining company's bike, and stuck in first, maybe a miner revved the living **** out of it and bent a valve, but it ran great all winter.
dad sunk it last fall and it's been running on 0-40 oil instead of 20-50 ams. no problems with that but... not my choice, by the way.
premium gas all the way, with an in-line filter.
clean carb every month anyway
need help before I lose it!
oh, and I blew the front driveshaft a few days ago and need help on how to take it out, and I need to know if I can run it with no front driveshaft until I get a new one.