Posted May 3, 201213 yr I've just brought a 2001 yamaha DT125r. the guy i brought it from has said he's been told by a mechanic that the crank seals have gone and need replacing, runs alright, abit noisy but thinking that might be due to holes in the exhaust, a freinds managed to get a clean one for me so going to fit that when it arives. apparently it hasnt long had a full engine re build, ive got some pictures showing this so unsure why he's saying this. is there any way of checking this without taking too much of the engine appart?
May 3, 201213 yr Moderator yes there are several ways of checking one is to drain the oil remove the engine take off the two engine cases chock up the engine on blocks until the cylinder base gasket face is approimately level (preferably in a tray) fill the crankcase with diesel and watch the two sides checking for weepage how does that sound?
May 3, 201213 yr Author sounds like it could be a bit of fun in that case, found a place to do a full re build and seals, for piece of mind while engine is out might get them to do that.
May 3, 201213 yr Moderator yes there are several ways of checking one is to drain the oil remove the engine take off the two engine cases chock up the engine on blocks until the cylinder base gasket face is approimately level (preferably in a tray) fill the crankcase with diesel and watch the two sides checking for weepage how does that sound? Like a lot of work, i'd go with riding it with the replacement exhaust and see what gives.
May 11, 201213 yr We'll whack on the new exhaust and see how it goes. What symptoms would leaking crank seals give? Loss of power, what else?
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