Chain length

You want the chain length to give you a good range of adjustment on your motor mount for the gears you might run. Another way is to use a different chain length for every gear change to keep the motor in the same place for best weight distribution but that's really pullin' hairs. I try to work it so I can just use a standard length of chain right out of the package.
 
I am curious now. Next time I scale I will do it with the engine in a couple of locations just to see how much the numbers change. Usually I run 120 link chains right out of the box.
 
Good idea on the engine. I have never really moved the engine back and forth to see how much difference it makes. May try it next time though.
 
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