part no. for moter for '91 polaris trail boss 2x4

[maggiemay199819]

I havn't been posting because my wheeler has been down. Did it right up last year with new struts, chain and sprockets, did the top end of the moter. Well... I wouldn't let hubby do the crank even though it hadn't been touched and should be. All back together and just using it around the property for yard work and every few days, she quits and you pull the plug and there is no gap. Obviously, every few days for some reason the piston comes up too far and hits the plug. Not good I assume. Logic says its the crank that "I" wouldnt let him change. Finally the time has come for hubby to tear her all apart again...if I get him the part numbers for the piston, rings,head gasket, base gasket, seals...maybe the crank shaft bearings. He has the imfo. somewhere here but he kinda thinks I can't find them on here...and I can't. Please can someone give me a link to somewhere that can help me. I just can't be wrong again. Oh and they have to be origional Polaris part numbers. I can't believe I didn't write them down and lost the reciepts. Grrr.

[RJ Gleason]

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[smallengineguy]

Is it a 2 stroke? If so, the crank bearings are probably gone, that's why it hit the plug. and you need to buy a whole new crank for it.