Hey Tim, I recently dumped about 8 pounds from my bike ;) Specifically the drive line. Follow the leader
http://ducatimonsterforum.org/index.php?topic=27004.0 (http://ducatimonsterforum.org/index.php?topic=27004.0)
Quote from: yuu on July 30, 2009, 01:09:13 PM
Hey Tim, I recently dumped about 8 pounds from my bike ;) Specifically the drive line. Follow the leader
http://ducatimonsterforum.org/index.php?topic=27004.0 (http://ducatimonsterforum.org/index.php?topic=27004.0)
Cool, Ian. Couple of questions. Did you weigh the parts you took off and the parts you put on to get that 8-lb reduction figure? Do you already have a lightened or aftermarket flywheel on the bike? Doesn't lightening the clutch basket and hub have the same affect (at least when the clutch is released) as a lightended flywheel? Is it any quieter than the stock clutch? Any differences in clutch take-up or release "feel"?
Tim
P.S. The 1000SS trackbike is making 87 hp and weighs (certified scales) 347 pounds with 2.5 gallons of gas. The S4Rs is making 133 rwhp and weighs 423 pounds with a full, topped-off fuel tank.
No scales, just a hand hold test. But the feeling, especially between the baskets was huge. The stock basket was a solid lump of steel, and the stock hub was no feather either. The stock basket was probably pushing towards 10 pounds, the new one was between 2 and 3. The wieght of the hubs was closer, but the new one was still a couple pounds lighter.
Stock flywheel on my bike - that's a potential change out item for later on though. Aside from porting and polishing, the innards of my engine are still (and about the only) stock items to the bike.
The effect of reducing the clutch mass the ride should be similar to reducing the flywheel - but it won't be the same same since it's part of the final drive the comes into play after the gear box, so you've got the RPM translation though the box to the clutch as opposed the to 1 to 1 for the flywheel mounted to the crank. If you want fast spin up and had to choose, flywheel is probably the way to go.
- but you won't have to deal with the idle adjustments that some folks need to keep the engine going w/ the lighter flywheel.
Quieter - yes. Different note as well. But do remember this a brand new basket with closer tooth to plate clearances that my beat up stocker. Though the stock steel basket rang for about a minute when I banged it on the bench - remarkably resonant. The Aluminum one didn't resonate like the stock one, so I'd expect it'll be quieter even when worn.
Didn't notice an differences in the take-up in my bench test - no road testing yet due to knee. But I don't expect an dfferences in the clutch action, just the throttle response as a result of the lower mass that needs turning.,
Quote from: yuu on August 03, 2009, 07:59:51 AM
No scales, just a hand hold test.
ya know...the hand hold test...part in 1 hand and a commensurrate amount of beers in the other...once you think they are equalled out, you drink said beers +1 for the bottle weight (at 1 beer for every 2 bottles or 1 beer for every 6 cans and then you go weigh yourself afterward and subtract the difference....
Yuu,
Did I hear you need a test rider? [thumbsup]