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The theory is to replace tranny oil at regular service intervals, common for motocrossers. Compactness of waterpump and clutch leaves no room for a dipstick measure on filler plug and no room for a sight window. Drain and measure if you sense a leak, otherwise just replace with specified amount as required.
Cheers.
It should be just that, a leaking seal, gasket. The water pump is external on that bike and doesn't go anywhere but the cooling dept.It doesn't get mixed with oil or anything. Take off the pump itself and replace the gasket. I think that should do it, unless it is the pump itself leaking. Suzuki RM125 RM 125 Water Pump Housing,,,, That is an ebay ad. Just in case. Hope this helps.
Did you check the main crank drive gear i had a 96 rm 125 with that problem. Its a cheap fix if thats the case but the only problem is that the engine needs to removed and the case needs to be be split. If thats not the problem with the case split it should be ovious.
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