Flywheel Question

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Protege BH with BJ engine
The flywheel for the F25M-R gearbox is 14lbs ?????. If I lighten it by 2 to 4 lbs will this be good or bad
 
It has been said the older B series1.6 and 1.8 trannies *should* fit the ZM 1.6. I don't think anyone knows for sure.
 
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