Flywheels Revisited

[koko64]

A future adventure/touring project has me thinking of heavy crank motors and heavy flywheels. Is it true that the ST2 flywheel is the heaviest of the two valver flywheels, maybe even heavier than the DS1000/DS1100 flywheel? If so, will it bolt straight into the DS1100 motor?
It begs the question as to the relative weights of the various heavy crank versions. I am thinking of touring smoothness.
Any info would be appreciated.

[Dirty Duc]

I have on hand two heavy flywheels that I can weigh. I think one came from an ST2 and one came from an ST4. I think the reason the heaviest one is not on Lucky (the 749LSR) is because some alternator covers have different internal dimensions.

Either that or the stator/rotor have different dimensions in different bikes.

[Speeddog]

I think the only differences on flywheel mounting are 1ph - 3ph.

[greenmonster]

The early ST2 came with a flywheel that's about 1kg heavier than the flywheel on a 900 carb or 748/916.  I replaced the original bolt on weight (it has no trigger on a single pick up injected bike) with one from a 748.  I did this because I didn't want to go too light â€" I had also thought of machining the 748 one down â€" so it still has 1.8kg of flywheel as opposed to 2.75kg std.

http://www.bikeboy.org/st2hicomp.html

[koko64]

Thanks to all you blokes for your input. Cheers.