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Old 08-11-2014, 04:01 PM   #1
MotoMatthew OP
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Oddometer: 32
KTM 2 Strokes (200XC) - Is there a vent for the gearbox oil?

I can't seem to see one anywhere. I've got a vent coming off the left powervalve cover (sitting on bike, looking down, to left), but that is right near the exhaust port on the head. That should just be for unburnt 2 stroke premix venting. All other visible vents with lines attached to them are coming from the carb.
I had some gear oil leaking out from the skid plate area after my bike was upside down. Took the skid plate off and couldn't' trace it. Only suspected culprit is this black vent tube running from the powervalve cover. From what research I've been able to do, if gear oil is coming out of this vent, then I've got a crank seal failure. I submerged this tube in a glass of water and it was bubbling with the engine at idle. According to the internets, this shouldn't bubble. The bike does seam to be smoking more than normal. I'm going to have to tear the bottom end apart I think.
Anyway, I was just wondering if the gearbox/clutch oil is vented? If so, where is it? I can't seem to find one.
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Old 08-11-2014, 06:26 PM   #2
yzmaico
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The power valve ring ( toothed horseshoe that rotates the barrels ) lowers into the lower case, contacting the gear driven portion of power valve. I do believe the crankcase vents thru the black hose on the left side of the jug.
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