Any one has one for sale let me know. I am not looking for those units from Germany that way 200g that is stupid for the road. I am looking at something that is about 50-60% weight of original.
Send us yours and we can machine it down. PM if your interested. We organise this for LouigiMoto also.
What's the price on this? I have a spare on in a monster 750 engine I was going to have a crack at over winter.
Cost for an SSie, 748/916, 749/999 etc type (basically any without the timing points part of the assembly) is £45 (includes return post to a UK address) - they end up about 700g (depending on initial version)
Ive often wondered about lightened flywheels on my 916. Reducing the mass obviously lets the engine spin up faster but by reducing the mass you also reduce the 'stored' energy in the flywheel. How would this manifest itself on a 916 for instance. Is this a worthwhile modification and what are the pro's and con's. I remember taking a tuned Lammy to 'run what you brung' at Santa Pod one year and we got carried away lightening our flywheel. (well we were about 21yrs old and stupid) Damn thing wouldnt get off the line. It kept stalling as there was insufficient energy to keep the thing spinning under load. Once we put a normal flywheel on we were okay.
With the mass in the crank of these engines a lack of inertia is not an issue. This question will open up a bag of replies some in favour some not. The following is my opinion only - My 900ssie has an aluminium spacer in place of a flywheel. The bike has been bored and stroked and has high compression pistons. It ticks over all day long smooth as any bike. It also has an amount of light components inside which help it rev slightly quicker (more like a 4 cylinder engine). The whole crank assembly has been balanced which may help. That is my 10p worth - the choice is yours.
On a 916 you can simply take the flywheel off as there are no pickup points so the wheel isn't needed. I have an alloy flywheel on my 916 which is the same dimensions as the original steel but a fraction of the weight, I didn't find it that much different in the way it rides, only a little quicker spinning up but for what little it weighs if I was to do it again I'd just take it off altogether and save the price of the flywheel, I doubt I'd notice the difference? My Monster has a Nichols alloy flywheel that basically weighs next to nothing and is, effectively just a carrier for the pickup. There is more than enough weight in just the crankshaft alone of both these (old school) engines so that they don't need any extra weight IMHO. Neither of the above bikes is prone to stalling, the Monster needs 'coaxing' when cold but that is because the carbs have no cold-start enrichment, only accelerator pumps to get it going and then it needs part-open throttle until warm enough to idle. Like MADASL's it has high-comp pistons, big-bore, balanced etc. and it has a power delivery like a punch in the face...
