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Discussion Starter #1
For example... Take a Rotax 670. How much bigger is the o.d of the cast sleeve than the cylinder in .001" How are they assembled at the factory? Warm cylinder & cold sleeve?
 

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Discussion Starter #3
Thanks! I would assume .004" on a 740 big bore sleeve.
 

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when I rebuilt my 1050 mach triple one of the sleaves twisted while honing. upon removal we found that it only had .0015 interfearance fit, not enough! .004 should be fine.
 

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.003 - .0035 on the 740 sleeve. I would suggest heating the cylinder to 500 degrees. It is not necessary to cool or chill the sleeve if the cylinder is hot enough.
 
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