stanley Posted September 28, 2014 Report Share Posted September 28, 2014 I am in the process of restoring my 77 350 Sherpa I am at the rolling chassis stage and now checking the motor over, before I started the project I rode the bike and all vital signs were good ie: gearbox selecting as normal clutch responding as normal engine crisp and responsive, I have taken ths cylinder head off and decoked the head and piston crown. I noticed there is no head gasket is this normal on my model ? also stamped on the cylinder close to the overlap joint is 159 R my engine No, is JM-19100771 the bore is unmarked with a std. Mahle piston any help gratefully received Stanley Quote Link to comment Share on other sites More sharing options...
stevem75 Posted September 28, 2014 Report Share Posted September 28, 2014 This engine does not use a head gasket. The 159 denotes model 159. My parts book shows that the m 159 to 191 models used the same liner. So all is correct with yours. If the engine is being somewhat disassembled now is a good time to do cylinder base gasket , manifold gasket and crank seals. All easy to replace and in doing do will insure a good running engine . Steve 1 Quote Link to comment Share on other sites More sharing options...
stanley Posted September 28, 2014 Author Report Share Posted September 28, 2014 Thanks for the reply Steve and yes base gasket manifold gasket and crank seals will be replaced Quote Link to comment Share on other sites More sharing options...
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