Bore clearence - ATV Enthusiast Community

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Old 07-07-2007, 10:50 PM
Thread Starter
Join Date: Feb 2007
Posts: 27
Default Bore clearence

How much is too much? After honing my jug I got around .005 piston to wall clearance, I`m sure this is too much. But I am asking only to find what the limit is. I know on automotive it`s suggested not to go over .006, but we`ve went all the way up to .008 and got away with it. I know on these engines it`s different.
I checked it with the piston in the middle of the bore and a .005 feeler gauge.
A .006 would go only if I forced it. The piston without rings does seem a little on the loose side. I`m thinking yeah I could build and run it but it might run 3 months before it`s smoking again. Thanks.
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Old 07-09-2007, 04:36 AM
The Facility
Join Date: Nov 2001
Posts: 4,059
Default Bore clearence

Doesnt matter what any book says because you must go by the piston. Forged pistons such as Wiseco for example use a greater clearance than a factory style cast piston because forged pistons "grow" as the engine gets hot. Your piston should have came with a small leaflet telling you the clearance recommended and the clearance recommended on your ring gap....which is also different from onw piston to the other based on the same reason.
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Old 07-11-2007, 04:57 AM
Thread Starter
Join Date: Feb 2007
Posts: 27
Default Bore clearence

Thanks Knows. Unfortunately, The piston came off ebay as NOS (new old stock)
And didn`t have a leaflet with it, it`s a real Honda piston, it has Honda on the side of it and 25, So the book was all I had to go by. I did find another jug and honed it to .0025 clearence, but I will ask the guys at the honda shop what the clearence should be when I go for the cam bushing and washer. My nephew just reassembled his 200x and he said it ran great for a little while then went to busting at upper RPM`s. He noticed the head gasket was blown, I asked him when he used the different head did he have the head and jug milled to assure they were flat? he said no, I said no wonder. I really appreciate all your help. And I`ll keep you posted on how it`s all coming along, with my back being screwed, it`s slow, but I`m getting there and doing it right, cause I don`t wanna have to go back and do it all again. Thanks again Knows.
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006 , 200 , 200x , atc , clearance , much , pistion , piston , wall

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