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Yamaha Raptor 350 & Warrior Forum

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schemi

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Is there any way to tell what has been done to my engine? The cylinder and head are silver with small spots of black paint left over, so it appears to have been off at one point. I finally got the carb cleaned and rejetted and new oil and plug. The reason I am asking is I can give it gas in second and pull the front wheels up. That is while I am sitting at normal riding position and I am 250 lbs. I can pull on the bars in 3rd and pull them up too. Haven't rode a warrior in 20 years so I cant compare. Stock gearing and 22" tires.
 
Only way to tell if anything has been done to the engines internalls is to partially dissassemble the engine. You MAY be able to ID the piston by taking the plug out and looking in the hole with the piston at TDC. But, that piston is going to have to be pretty damn clean to read the characters on it's crown. If anything, you should be able to tell if it is a domed piston or not. Domed means aftermarket. Only other things you can do is remove the cam, to see if it stock or not. And, lastly, you can remove the intake and exhaust to inspect the ports to see if they have been ported.
 
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