Ok here we go, Yamaha 2003 50t a few days ago started running like crap, changed plugs, removed and …

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Doug Lanham asks: Ok here we go, Yamaha 2003 50t a few days ago started running like crap, changed plugs, removed and cleaned crabs, still runs like crap, changed coils and coil pack, still runs like crap, smokes a lot, compression, 120, 118, 100 help. Also might be looking for 50t or 70t

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Not a tech but it looks like you answered your question with the compression check. I know they can do ok when ones low but it could be getting worse when it heats up

I’ve seen guys claim good results from a special Yamaha oil additive. And heard of treating the bad cylinder with a sea foam product. Hopefully someone can fill in the blanks I left. Good luck