Lighter flywheel question

[JWilliam]

Does anyone manufacture a lighter flywheel for the 904cc engine? Fast street use not race, could lighten the original flywheel but it is guesswork and easier to buy a prebuilt unit.

[paso750]

Does anyone manufacture a lighter flywheel for the 904cc engine

injected or w/ carbs ?

I have a P750 and am using an aftermarket flywheel for 750 SS/Monster/Cagiva Elefant. The thing to be careful of are the mounting screws as they need to have flat heads otherwise they may touch. (So if taking parts ment for other models turn by hand first before you start up the engine.)

I guess that for a 906 an aftermarket flywheel of a 900 SS/Monster could be used and for a 907ie the one for a ST2.
But I don`t really know ...


G.

[Finnpaso]

I am running my 907 with lightened flywheel. Its lightened with lathe from original 907IE flywheel. about 800g away. Easy to do from original 907 flywheel... Also another side of engine about 1 kg away with STM 48 teeth aluminium clutch... front wheel is quite light... ok, also in rear bigger sprocket...... Very satisfied now....

[Mc tool]

ducati do .My 1990 paso has a steel flywheel and my 1997 sl has an aluminium flywheel . the paso is inflicted with a webber -marelli ignition system where as the S L has a koukosan ( spelling ? ) I dunno for sure but maybe the 907 has the koukosan ignition , which would mean that the SS or SL flywheel would fit . In my humble opinion ,I think that the lighter flywheel plays a part in the noisey, hi wearing clutches in the SS / SL models because the lighter weight doesn't dampen the firing pulses at low revs as well. I do intend to swap the clutches ( cant swap the flywheels as the ignition systems are totally different ) over to see if it makes a difference. I am also suspicious of the rubber dampner in the SL clutch hub ( my 906 doesn,t have this ) as a contributor to the noisey clutch . any thoughts ?

[Tamburinifan]

I dunno for sure but maybe the 907 has the koukosan ignition

907 is fuel injected, totally different ignition & flywheel.

[nickapaso]

Well, fast by ferracci makes a lightened flywheel for the 907. It weighs .67kg I'm not sure what the stock one weighs. I just googled 907ie flywheel and it was the first choice.

[JWilliam]

. In my humble opinion ,I think that the lighter flywheel plays a part in the noisey, hi wearing clutches in the SS / SL models because the lighter weight doesn't dampen the firing pulses at low revs as well. any thoughts ?

Actually thats real interesting. Typically I would go ahead with a mod but the possible clutch wear issue is enough to pause it - and not something I would have thought of. Just want to work out the energy needed to make a 1.5kg flywheel turning at 8000rpm to accelerate to 9000rpm with a time interval of 2 seconds.

[Tamburinifan]

In my humble opinion ,I think that the lighter flywheel plays a part in the noisey, hi wearing clutches in the SS / SL models because the lighter weight doesn't dampen the firing pulses at low revs as well.

Disagree.
My alu basket & plates on my Moster is quieter and doesn´t wear more than steel.