Reverse Rotation H4 Magneto

The gas-start diesels (MD, WD6, WD9 etc.) all use the "reverse rotation" H4. The W9 is only gas engine that uses it.
 
The Gas W9 has a very different advance rate and amount than the diesels. (IIRC, some diesels have limited or no advance. Jim
 
Indeed! While the rotation direction is the same, the advance curves for the W9 gas and the gas-start diesels are signficantly different.
 

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