Dirtclods Posted August 20, 2022 Report Share Posted August 20, 2022 I have ran across a discrepancy in what I have and what I have read and seen. I have a stock and aftermarket stock size pistons. Both have the windows on one side and the arrow on the other. The parts diagrams I have looked at all show the arrow and windows on same side facing forward toward exhaust. Am I missing something or is something not right here. I am about to put the piston in with windows toward exhaust but the arrow will face back which goes against every piston I've ever installed. Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 20, 2022 Report Share Posted August 20, 2022 The holes go to the intake side. 2 Quote Link to comment Share on other sites More sharing options...
feetupfun Posted August 20, 2022 Report Share Posted August 20, 2022 There are plenty of mistakes in the diagrams in the Yamaha TY parts books Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 20, 2022 Report Share Posted August 20, 2022 Diagrams copied how many times in 50 years. LOL It helps to understand mechanics of 2 strokes in the first place. We went decades with barely any real information, except the one between our own ears. Quote Link to comment Share on other sites More sharing options...
Dirtclods Posted August 21, 2022 Author Report Share Posted August 21, 2022 Thanks guys. Follow the arrow and not the holes. I usually only have holes in my pistons after I ride it. Quote Link to comment Share on other sites More sharing options...
djr Posted August 21, 2022 Report Share Posted August 21, 2022 I once purchased a non-running 2 stroke bike at a cheap price. The only fault was the piston had been fitted the wrong way round. ( That was the only lucky purchase I have had, most non-runnners I have got involved in have been much worse than expected ) 1 Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted August 25, 2022 Report Share Posted August 25, 2022 On 8/20/2022 at 11:29 PM, lineaway said: The holes go to the intake side. Assuming it is a reed valve model. They MUST be Quote Link to comment Share on other sites More sharing options...
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