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b210 rebuild

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Don't quote me on this....... I would guess that you would only go out maybe +.030". Then you're talking an oversize piston and rings. I doubt the cylinder meat is the same on the 24 ci and the 32 ci engines. I would start to worry about overheating and warping the cylinder wall and cracks when it gets thinner.

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No, the 10hp is a different block from the larger engines. As Tim mentions .030 is as far as you can go, but I believe only the .020 piston is still available, you could have it sleeved back to standard if necessary.

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Agreed. I maintain a 9hp(23D) 2 10hp and now a 12hp synchro. They have the same footprint and interface and external dimensions but the depth of metal within the fins is a good bit different as the bore goes up in size. Still working on the 12, but the 243431 is a pretty solid reliable engine. As long as it is maintained right and has good throttle bushings it is hard to beat.

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