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Canadian Daves JustKDX
Bottom end rebuild? (pic heavy)
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[QUOTE="dirt bike dave, post: 1391070, member: 18302"] The oil in the transmission is not normally under pressure, because it is normally isolated from the crankcase. If there is any slight pressure normally, it is from the spinning of the gears. Your motor obviously ran for a bit with chunks floating around and either had bad crankshaft bearings or a bad 'big end' (lower rod) bearing. The wobbly crank or loose rod probably wore down the dividing wall between the crankcase and transmission. If you are lucky, the hole is only on one half of the crankcase. You will have to split the cases and remove the crank to see how bad it is. A minor hole can often be repaired. My guess is the hole is probably down low near the bottom rear of the crankcase, near the center seam. Basically, with the motor running, the combustion pressures pushed through the hole in the crank case and forced your tranny oil out the breather tube. The tranny probably got the gas in it after the motor stopped running. When you were kicking it trying to get it restarted, or if you left the fuel on after the bike died, some of the gas ended up draining through the hole between the crank case and transmission. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Bottom end rebuild? (pic heavy)
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