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for single cylinder,6 u& g- I& j. U/ }
1. Weigh the rotating parts (bottom of connecting rod, lower connecting rod bearing, counterweight pin), `* W% O+ ?5 U) n- \6 V& j3 k
2. Weight the reciprocating parts (piston, rings, wrist pin, top of connecting rod, top connecting rod bearing): t. s9 `% ~( d/ g$ n4 _1 X
3. Use 100% of the weight from #1 and 50% of the weight from #2.6 k" K S; E: v& P1 }4 O
4. multiply result of #3 by 50% of the stroke length to get the torque needed for the counterweight& o1 @$ m4 F$ C
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