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1988 TY250 base gasket

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Hi ti all, replacing base gasket and I notice the existing one is made of a thick gasket paper and the genuine ones I see for sale all have the port cutouts where my old one does not. Only recently purchased and appeared to run ok but was leaking around the base gasket when hot.

Many thanks  for any advice.

Cheers Rob from NZ.

Do you mean the port cutouts on the existing gasket are in the wrong place or the gaskets you've seen advertised have the port cutouts in the wrong place?

  • Author

Thanks for getting back, I mean my existing gasket that's on the engine has zero cut outs except  for the piston area in the middle,  makes me wonder how the gates flow correctly through the ports. 

Cheers Rob.

18 hours ago, NobbyC said:

Hi ti all, replacing base gasket and I notice the existing one is made of a thick gasket paper and the genuine ones I see for sale all have the port cutouts where my old one does not. Only recently purchased and appeared to run ok but was leaking around the base gasket when hot.

Many thanks  for any advice.

Cheers Rob from NZ.

My advice would be to buy a genuine  YAMAHA gasket 38V-11351-10 . Yes the gasket should have port cut outs so that  fuel flows easily up to the top of the piston from the crank case. and to the crank bearings also.

Edited by Tr1AL

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