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i have an old 2 stroke dirt bike. the oil seal between the engine and transmission failed. the engine sucked up oil into it while runnng and created a gritty substance or it seemed that way if you touches the oil that was on the piston and cylinder. i removed those. I am putting in new rings and dont want to have any damage caused by old transmission/motor oil in the engine. all the bearings have no play. I want to know how to get the oil out of the crankcase. this is an air cooled 2 stroke it is a ke250 and it is almost impossible to find parts for. i got lucky and was able to find one part. i am getting rings from a machine shop
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the seal between the crank ant the flywheel where the electronics are i could try to clean it with the old seal off. still trying to find a new seal.
My passion is snowmobiles and I’ve been dealing with 2 strokes for a long time. If it was me, I wouldn’t take any chances. I would just take the whole thing down and split the case and clean it thoroughly.
If you suspect there is any type of grit or other contaminants in the case. Take the opportunity know to clean it. The grit your probably seeing is the metal particulates that were trapped in the ATF fluid from the gear wear in the trans.
i think the grit was either carbon in the oil or metal/clutch particles. i dont really want to split the transmission and engine but i might if i feel the need maybe i will run an old shirt through the crankcase to try to clean it. what is a good price for rings from a machine shop?
Do not use brake kleen or any break cleaner!!!!! It will ruin the seal because of the high concentration of acetone. Acetone will eat the plastic and dissolve the seal. My personal opinion as a chemist would be mineral spirits. you could use k-1 grade kerosene as well, however, you’ll have less fumes with the spirits. I would take the case apart and use a tooth brush or dish brush. If you want to just flush it I would pour mineral spirits in filler and take out the drain bolt and just keep circulating what comes out. This won’t be as practical or effective, but it will definitely get something out. How dirty is the transmission fluid?
there is no filler or drain bolt. i have the top end off so you can see the crankshaft and stuff. could i use gasoline to clean it out? the fluid is not too bad. only has a couple hundred miles on it. also would overfilling the transmission ruin the seal? thats what I stupidly did. the seal was on its way put any way.
you can use gasoline. gasoline is more volatile so you’re going to have to deal with more fumes. I would do this outside. over filling may have caused the failure by putting excessive pressure on the seal, however, the seal was probably on its way out from age and deterioration from contact with the oil. The dirtier the oil the more acidic it becomes for several reasons. Good Luck!!!
I would still take it down. Even if you do clean the case. You still need to resolve all of the fluid that’s made it way into the crank bearings.
i dont want to take it apart for these reasons. I have never split a motorcycle transmission before, it will be alot of work, and it has a gasket made out of a goo stuff from the factory and i dont want it leaking.
I don’t recommend brake clean or gasoline instead use mineral spirits as this is what is is most parts washers, it seems to do a good job and it doesn’t seem to ruin rubber parts. That said if the oil’s are similar it might be a waste of time, you might be able to just change the oil in the crankcase a couple of times and you’d be fine, not sure however but it’s worth a thought in my opinion.
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