Lightening flywheel... How much?!

[JMH900sie]

Heya guys!

I'm doing some pretty extensive repairs on the monster at the moment, and ice decided I might aswell pull the flywheel and have some weight machines off it..... I just don't know how much!! Has anyone on here done it? If so, how much weight should I be looking at removing?

She's ridden everyday, so I don't want it to be crazy snatchy, but I do want to be able to rev up a bit quicker!


Thanks guys

Joe

[slob]

I used an Aluminium flywheel, 632g instead of 1873g.
http://www.thelasturl.net/m1000/flywheels.jpg
Before you start removing metal remember it needs to remain balanced!

[JMH900sie]

Bloody hell that's a weight saving! How do you find it? Also, how much did it cost you if you don't mind me asking?

[Darren69]

You can buy lightened flywheels fairly reasonably. SSR racing do one which is in my Monster 500g! makes it pick up much better and less engine braking effect

[slob]

http://www.ducati-kaemna.de/kataloge/ducati.html?cat=170
around £100

[Darren69]

Kaemna is good stuff or these from the US

http://www.ebay.co.uk/sch/m.html?_odkw=&_ssn=ssr_mfg&hash=item35c41452f3&item=230922932979&_osacat=0&_from=R40&_trksid=p2046732.m570.l1313.TR11.TRC1.A0.H0.Xflywh eel.TRS0&_nkw=flywheel&_sacat=0

[Dukedesmo]

I have an alloy Nichols flywheel http://www.nicholssportbikes.com/products/NFLYCARB90_98.html can't remember how much it weighs but it is very light (maybe 200g?).

Idling is not particularly smooth but that's also down to other mods, but it certainly spins up (and down) quickly.

http://www.nicholssportbikes.com/images/NFLYCARB90_98.jpg

http://ducatiforum.co.uk/data/photos/l/2/2237-1381679455-19151ed87a395a5dea7bdd4a25293d00.jpg

I don't know about your bike but some of the injected models that don't have the pickup on the flywheel you can remove it completely...

[Darren69]

200grm jeez that must spin up real quick. I found with mine it was fine if the engine warmed up real good first maybe 50-55c coolant temp anything lower and it was real easy to stall the thing but otherwise its all good. And given the recent discussions on oil temp and extended warm up isn't a such bad thing? Every other change is beneficial because you can forget you're riding a big twin it feels more like a 500 single off the throttle and you have to adjust your riding style because there is little to no engine braking felt or much less than before so you have to actually use the brake. If you open the throttle it spins up so quick it feels like you've spent 000's on engine tuning!

Its worth doing in tandem with a clutch upgrade because the standard clunker clutch weighs a ton.

[Darren69]

Oh yeah and the sound when you blip the throttle goes from barrumba, barrumba to bwah!!!, bwah!!!. 'kin awesome makes small children cry and those of a weak disposition **** their pants! :)

[slob]

... so you should feel a reasonable but friendly difference if you got someone to turn 500g off the outer edge and check the balance. Mine spins up stupidly quickly.

[JMH900sie]

I'll do that then.... Got a full aluminium clutch going in Monday (including the basket). She's ridden everyday so I don't want it to be too much you know

[Darren69]

I'll do that then.... Got a full aluminium clutch going in Monday (including the basket). She's ridden everyday so I don't want it to be too much you know

It won't be too much on the road, in fact it actually makes it easier to ride with less engine braking and clutching to smooth it out BUT it does make it more easy to stall when pulling away but if its warmed up and you are used to it its fine. I was told that it might not tick over smooth but again no problem, just the stalling as without the counter weight your hand has to be more sensitive and any resistance can stop it spinning. When its nice and warmed up its not noticeable really unless you're crap on the clutch and heavy handed. Think tuned 2 stroker 250 and you'll be fine but tbh that is an exaggeration a jap 4 would probably stall that easy anyway. Just go for it as I did, it just makes the bike more special to you as well really but in everyday use it is fine and more fun.

[Dukedesmo]

Consider that the crank itself is massively heavy, especially compared to newer models so you don't really need (IMO) the huge flywheel plus you can lose a lot of weight off the clutch (which is also part of the 'mass') if you have a steel basket.

I replaced the steel flywheel on my 916 with one to the same design but in alloy and it is a huge difference in weight, it picks up speed almost instantly - even quicker than the Monster but that's mainly because it's a shorter stroke and better breathing (even though the Monster has a lighter flywheel) but if I was doing it again I'd probably remove it completely for even quicker response and cheaper too.

On the carby Monster you do need something to carry the pickup - which is all the Nichols flywheel basically is.

Monster engine does a better 'Bwah' noise than the 916 though. 916 has a strong power delivery from anything over 2500 rpm which is nice and progressive whereas the Monster lugs a bit under 3000 rpm but above that the delivery is much less subtle, more baseball bat in the face than shove in the back. :D

[JMH900sie]

So I don't even need a flywheel on Injected model?

[Dukedesmo]

So I don't even need a flywheel on Injected model?

Not if it's like the one on a 916 which is just a big, heavy weight? As the ECU pickup is taken from the gear on the cambelt driveshaft.

It's certainly cheaper than buying an expensive lightweight flywheel.

[JMH900sie]

Hmmmm. I'll have a look Monday. At the moment my list for Monday consists of:

Fitting new headstock bearings and races
Fitting a new clutch (complete)
Spraying my newly bored yokes
Fitting an entire ohlins front end
Pulling and cleaning all rose joints.


Hmm. Time might be ahort

[slob]

I don't reckon you'll get a nice tickover without anything in there, happy to be proved wrong though.

[Yorkie]

The flywheel on my ST2 has gone from 5kg to 1.3kg so I am hoping now everything is is balanced that it will spin up and shut down in a quite aggressive manner.

I had the Pistons, Flywheel and crank all done.

Yorkie

[JMH900sie]

God damn performance upgrades. Rinsing my bank account

[Yorkie]

Original flywheel:

http://i1286.photobucket.com/albums/a615/Yorkie13/Ducati%20Monster/IMG_1693_zps20d9d9da.jpg (http://s1286.photobucket.com/user/Yorkie13/media/Ducati%20Monster/IMG_1693_zps20d9d9da.jpg.html)

Trimmed down flywheel:

http://i1286.photobucket.com/albums/a615/Yorkie13/Ducati%20Monster/20141215_121818_zps88130f12.jpg (http://s1286.photobucket.com/user/Yorkie13/media/Ducati%20Monster/20141215_121818_zps88130f12.jpg.html)

Primary gears trimmed down:

http://i1286.photobucket.com/albums/a615/Yorkie13/Ducati%20Monster/IMG_0068_zpsb4f5363c.jpg (http://s1286.photobucket.com/user/Yorkie13/media/Ducati%20Monster/IMG_0068_zpsb4f5363c.jpg.html)

Lightweight adjustable cam wheels:

http://i1286.photobucket.com/albums/a615/Yorkie13/Ducati%20Monster/Ducati%20750SS%20Project/photo8_zps8e2da76e.jpg (http://s1286.photobucket.com/user/Yorkie13/media/Ducati%20Monster/Ducati%20750SS%20Project/photo8_zps8e2da76e.jpg.html)

Alloy intakes:

http://i1286.photobucket.com/albums/a615/Yorkie13/Ducati%20Monster/Ducati%20750SS%20Project/photo73_zps5dd161a7.jpg (http://s1286.photobucket.com/user/Yorkie13/media/Ducati%20Monster/Ducati%20750SS%20Project/photo73_zps5dd161a7.jpg.html)

All the bits and work are available from Mark at http://www.madasl.co.uk/products.php

I am also having the clutch case trimmed to allow more venting and to show off the alloy basket.

Yorkie