Do you have to replate a cylinder after an overbore?

dirtyfingers said:

Yes, you definetley need to replate the cylinder. The plating is called nickasil, its like chrome plating. I f that plating is not there you will ruin an engine faster than you can say "duh". An option is to have the cylinder sleeved, which a cast iron liner that gets shoved in there and can be bored multiple times without replating of any kind.

Click to expand...

well if i get a sleeve is it gonna cause me to order a different piston? cause i have already ordered it...how exactly does it work? do i bore it then put the sleeve in or what? thanks in advance for the help guys!

DrBob said:

If you wanted to sleeve it to .30 over, you would need to have the cylinder bored WAY over, then slide the sleeve in to bring it back down to only .030 over. This much machine work is expensive, and not really a benifit unless you plan to race the machine and tear the motor down weekly.

Click to expand...

well i already got the .030 piston ordered so i guess i should have it replated? also is it bad to bore it .030 over? im not racing it...i just wanted some extra power

DrBob said:

[quote="99RM250]well i already got the .030 piston ordered so i guess i should have it replated? also is it bad to bore it .030 over? im not racing it...i just wanted some extra power

Click to expand...

Yup, replate it. No. going .030 over is not bad at all. Some people get carried away and go too far over, but .030 is quite reasonable.
Racers tend to tear a motor down after each weekend or sometimes after each run, so the cast iron sleeves are a good idea: they let you hone and even bore to your heart's content without needing to contantly replate, saving time and money.[/quote]

thanks for the help man..and a thanks to everyone else as also...