YZ 250 Yamaha 2 stroke casing hole.

[cart_man]

Hi.

I have a YZ 250 2 stroke that is roughly 9 years old. Recently it started leaking oil from the motor casing. So I checked it out and it seems like I have a hole in the lower casing right in front of the front sprocket. It seems like my chain actually chipped away at it even though its nowhere close to it. I spoke to a couple of guys and they said that it is quite common for this to happen and that it is indeed the chain.

My question is HOW? And also how do I fix it?
My understanding is that anything yamaha is seriously expensive stuff never mind the belly of the motor casing

Thanks

[dangerousdave]

Best way to repair is to track down another crank case, and replace it as a unit.

There are other options such as using liquid metal, or an alloy weld repair but how effective these would be i would not know. These are a bit of a bodge in my opinion. The alloy weld would require the crankcase to be split anyways so you would be better off just replacing it.
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1988 Kawasaki KMX 200

Previous: Yamaha YZF1000, ZZR600, KMX200, DT50, KX80, CG125, PF50

[Pete.]

Put up a photo don't have to take the engine apart should be able to weld it easy.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good