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black spot under piston and other top end ?'s
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[QUOTE="njrealtor55, post: 1009334, member: 63820"] burnt oil under the piston means the wrist pin is getting good lubrication. don't worry about it - I'd only worry if there was none. you have to mic a piston to see the size to tell if it is in need of replacement. Personally, I'd just replace it - as you have it out now. Better to start with new parts on your newly acquired machine than guessing. Always use new rings and gaskets when doing a top end. the cylinder.. run a ball hone thru the cyl about 3 times (3 passes) and see if it helps. most likely it should clean it up just fine. torque wrentch.... well, yes you should use one, but if you make sure to tighten everything - and then double check it being extra cautious... i'd say you could get by without a torque wrentch. I wouldn't reccomend it - but it can be done. make sure to measure the ring end gap before installing the piston. a lot of people i know who rebuild 2 strokes always forget this step. hope it works out for you. :) [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
black spot under piston and other top end ?'s
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