cub pistons

brandon j · Dec 15, 2013

I tore my son's cub lowboy down and it has 60 over in it and it has small ridgs in the tpo of the cilenders can it go biger dose any one make 90 over pistons or should i just hone it and new rings?

gene bender · Dec 15, 2013

hone it and go with new rings for now mite be thats all it needs and depends on how much you are going to use it.

Janicholson · Dec 15, 2013

If the ridge is at or less than .0035" Diametric change compared to the bottom of the cylinder, removing the ridge with a ridge reamer and glaze breaking with a bead breaker will be doable. If more than this (up to maybe .006) it can be straight honed, and the pistons can be re-sized by Knurling to fit. There are few shops setup to knurl pistons. They will be nervous that they will either break a piston knurling it, or that the job won"t last, or that it will still have piston slap.
You might have to sign a waver to get it done.
An alternative is to have the block bored out and repair sleeves installed to return it to original diameter. This works well, and is common practice. It is more expensive, but the issue is correctness to keep it in good reliable operation. Jim

David G · Dec 15, 2013

Always cut the ridge before taking pistons out.

brandon j · Dec 16, 2013

thank you for the info

cub pistons

brandon j

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gene bender

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Janicholson

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David G

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brandon j

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