Question about 1986 Yamaha RD 350

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Oil tank weld?

It seems I have an oil leak somewhere on my oil tank. It seems to be the mount weld on the inner side closest to the engine about halfway up and closest to the front wheel. Is this where everyone else has had the oil leak develop? Otherwise, I have no idea where it is coming from. Seems that the dealer overfilled the oil last time I took it in for a service. What would happen if they overfilled by, say 1/2-3/4 liter?

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I just recently had an oil cooler split at one of the seams, so make sure you check around both of those.

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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1 Answer

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1 Answer

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1 Answer

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This model was notorious for leaking oil, there were a number of issues, one of which was the fit of the seals around the oil pump assembly, the inner and outer sealing was replaced by a single piece seal to make it better part no. 545037101, there were also issues with the oil tank itself, the outer half was friction welded on to the inner, some of the seams were not very good and oil would leak from there, in very extreme cases the muffler would leak exhaust gas onto the top of the tank and melt a hole in the tank.

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1 Answer

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Good Luck
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1 Answer

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2 Answers

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