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There must be a balance difference between the 2.5 and 3L flywheels because the crankshaft has a longer throw on the 3L than the 2.5L. That the same flywheel has been used on 2.5 and 3L is not correct, cannot be. In the september 1988 the factory spare part list there is listed two different numbers for the 2.5 and 3L flywheels: they are not the same!
Hopefully somebody(JJ?) can find flywheels with these numbers and compare physically and even checking balance in a balancing machine.
Factory spare part number of september 1988
3L flywheel : 19546 02040 00 00
2.5L flywheel: 19555 02040 00 00
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