cwalsh

iTrader: (9)

If a set of pistons were changed out and the new ones were the same material and mfg and were 8 grams lighter would the crank have to be rebalanced?

Chris

Mercier

iTrader: (15)

IIRC, only way to really do it right is to balance the entire assembly..assembled.

Chris

cwalsh

iTrader: (9)

Figured as much but didn't know if there were any allowable +/-

Chris

KCS

iTrader: (20)

It should be fine, but my local machine shop only charges $125 if all they have to do is drill some superficial holes. They charge more if they have to measure and calculate the bobweight and/or add heavy metal. For that price, I'd rebalance but some engine builders like a little overbalance for applications that are going to turn some considerable RPM. I'd say you could get away with 8 grams.

cwalsh

iTrader: (9)

Since mine should just have to be drilled I'm assuming I'll spend the money and have it done. If I'm that deep what's a few more dollars.

Mercier

iTrader: (15)

IMO sleep at night is worth that..but much of the rest of the crowd on here is more experienced than I am. $125 or so seems like good money for piece of mind.

cwalsh

iTrader: (9)

I am going to have it spun up and go from there.