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for single cylinder,
' f9 B% b3 ^. L4 T% f2 I1. Weigh the rotating parts (bottom of connecting rod, lower connecting rod bearing, counterweight pin)
0 p% t: D; n a$ t* O2. Weight the reciprocating parts (piston, rings, wrist pin, top of connecting rod, top connecting rod bearing)
. h, K# u9 `7 L* q3. Use 100% of the weight from #1 and 50% of the weight from #2.
, c6 K' x ~, n3 Y4. multiply result of #3 by 50% of the stroke length to get the torque needed for the counterweight( G9 S# }# `+ H4 M: }+ U# r
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