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post #1 of 14 (permalink) Old Apr 20th, 2019, 8:42 am Thread Starter
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flywheel machining

Wanting to trim some fat from my stock 900ss ie flywheel -- rather than go the aftermarket (reviews are mixed on the nichols and ssr), I'd like to machine down the stocker. Fast Frank no longer does it, and waiting to hear back from Ben at Fox Performance... any other options people would recommend?

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post #2 of 14 (permalink) Old Apr 20th, 2019, 9:33 am
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Got the one on my Hypermotard cut down factory flywheel from the DucPond.

2008 Hypermotard 1100S, 2004 Green Ducati.
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post #3 of 14 (permalink) Old Apr 20th, 2019, 9:33 am
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Originally Posted by tangobravo View Post
Wanting to trim some fat from my stock 900ss ie flywheel -- rather than go the aftermarket (reviews are mixed on the nichols and ssr), I'd like to machine down the stocker. Fast Frank no longer does it, and waiting to hear back from Ben at Fox Performance... any other options people would recommend?
I hadn't heard anything bad about the Nichols until you just said it here.

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post #4 of 14 (permalink) Old Apr 20th, 2019, 9:47 am Thread Starter
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https://www.ducati.ms/forums/57-supe...r-stories.html

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post #5 of 14 (permalink) Old Apr 20th, 2019, 11:45 am
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I machined one years ago. I think I removed 300g from near the periphery. I never got to install it on my Monster; another guy bought it. I heard back from him only once and that he 'liked it'.

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post #6 of 14 (permalink) Old Apr 20th, 2019, 1:49 pm
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I have a local machinst turn mine down so if you hand it to a skilled lathe operator and tell them where not to cut you should be fine. I have the 900 ie versions reduced from 4 down to 2 lbs.

Nichols is the best of the aluminum flywheels but I have seen them fail as well, if you want the lightest they are your best option. A steel flywheel turned down will not get as light as aluminum but it will never fail. If you go super light you also need to keep your bike tuned as the motor has less mass to keep the motor turning at idle. A 748 build on my dyno right now has its idle turned up because we went very light on the crank,flywheel (Nichols),gears. pretty much anything that spins. if I try and get it to idle near stock idle it will stall more often than a normal motor because it has less inertia to keep it running.

Stock flywheel turned down should be 100% reliable and at 1/2 the weight you should not have any issues with idle. Best bang for the buck mod.
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post #7 of 14 (permalink) Old Apr 20th, 2019, 9:03 pm
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I went thru Ben at Fox performance, and maybe I caught him on a bad day but I chalked it up to the cranky machinist syndrome, and he did everything as advertised. I haven't actually installed it yet, since I just took my bike out of winter storage today.
I currently have a Nichols and damn I love the way it revs, but yes, it too is a cranky bastard. Loves to stall, and my starter is starting to sh*t itself(I have a rebuilt starter sitting on the shelf, right beside the turned down stocker flywheel), so starting can be cranky. Although she fired up pretty damn fast after being under a tarp for 6 months.
Anyways, I am looking forward to getting this installed, and I'll sell you a Nichols in a few weeks for cheap if you want it! lol.
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post #8 of 14 (permalink) Old Apr 20th, 2019, 9:27 pm
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it's a pretty easy machining job, just cut it down to 120mm od and 12mm thick. makes them about 850 grams.

the std cranks are about 4.5kg, plus the alt rotor so 1kg off the flywheel is still not a huge % change. the reduced diameter probably makes the biggest difference on a machined std one.

more ignition advance is the best way to stop them stalling at idle, if you can.

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post #9 of 14 (permalink) Old Apr 21st, 2019, 10:22 am
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The Op has a injected bike so not timing changes on that one.

I have not seen starter or starting issues with a Nichols flywheel other than the increased chance you will be doing it from stalling. The 748 on the dyno would be fine if i bumped the idle a couple hundred rpms but some bikes (carbys) do not like that and the idle will hang up if too high. Running a superlight flywheel can be done but the bike just needs to be kept in tune and if it is out just a bit you have increased stalling issues.
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post #10 of 14 (permalink) Old Apr 21st, 2019, 11:27 pm
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The Op has a injected bike so not timing changes on that one.
if you put more advance in to the map at idle it will help with the stalling a lot.

know all wanker
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