Author Topic: Dry clutch on CB750 (Read 131672 times)

MRieck · « **Reply #25 on:** October 26, 2009, 04:51:10 AM »

Quote from: lordmoonpie on October 26, 2009, 04:21:37 AM

Quote from: voxonda on October 26, 2009, 03:59:37 AM

Hey LMP,

Great to hear of your interest, the one on your 450 is a Cappellini isn't it?

Rob
Hi Rob,
No it's a Nova dry clutch. It was actually a total pig to get working despite being sold as a kit to just bolt on. Took me nearly a year and lots more modification to the engine to get it sorted but now it's as sweet as a nut! I think it's based around an old Yamaha TZ clutch with obviously a custom cast crankcase cover. The clutch is very small but I'm hoping it'll solve the usual CB450 clutch slip or burnout problems...

It bolts on after you use the lathe and mill.

voxonda · « **Reply #26 on:** October 26, 2009, 04:59:48 AM »

Keep hearing that from parts that come from Nova. Must say have no experience with them myself.

lordmoonpie · « **Reply #27 on:** October 26, 2009, 06:31:47 AM »

Quote from: MRieck on October 26, 2009, 04:51:10 AM

It bolts on after you use the lathe and mill.

Never a truer word than when spoken in jest....Mike you don't know how right you are

ColinMc · « **Reply #28 on:** October 26, 2009, 03:20:14 PM »

I'm in. If I can get that nice dry clutch rattle like my Ducati has...it's worth it! That and swapping clutch plates is freaken as easy as pie!

Let me know how much and where.

kos · « **Reply #29 on:** October 26, 2009, 04:57:06 PM »

They are neat to look at & hear running, but only a few makes use them anymore. Duc and ? I don't know who else. Moto GP and AMA/World Superbike do just fine without them.

KOS

754 · « **Reply #30 on:** October 26, 2009, 06:18:18 PM »

Ahh they just want to sound like open belt Panhead and Shovelhead choppers...

turboguzzi · « **Reply #31 on:** October 26, 2009, 07:27:22 PM »

Quote from: kos on October 26, 2009, 04:57:06 PM

They are neat to look at & hear running, but only a few makes use them anymore. Duc and ? I don't know who else. Moto GP and AMA/World Superbike do just fine without them.

KOS

WSBK yes, but Moto GP are definetely on dry clutches

recent M1 motor, what a jewel.....

kos · « **Reply #32 on:** October 27, 2009, 06:36:42 AM »

Not all of them....

KOS

lordmoonpie · « **Reply #33 on:** October 27, 2009, 06:41:05 AM »

Quote from: turboguzzi on October 26, 2009, 07:27:22 PM

Quote from: kos on October 26, 2009, 04:57:06 PM
They are neat to look at & hear running, but only a few makes use them anymore. Duc and ? I don't know who else. Moto GP and AMA/World Superbike do just fine without them.

KOS

WSBK yes, but Moto GP are definetely on dry clutches

recent M1 motor, what a jewel.....

And the world 250 and 125s are almost totally dry clutch models. Maybe it's a two stroke thing?

voxonda · « **Reply #34 on:** October 27, 2009, 06:59:49 AM »

One of the reasons for not using them is the 'noise' problem, nowadays 'they' want to (over-)regulate everything, so the static noise level has to come down, and is in the past few years.

voxonda · « **Reply #35 on:** October 27, 2009, 07:00:47 AM »

Quote from: kos on October 27, 2009, 06:36:42 AM

Not all of them....

KOS

Which one does not use a dry clutch in Moto GP, Mark?

MRieck · « **Reply #36 on:** October 27, 2009, 07:07:11 AM »

I thought WSB &AMA Superbike rules stated the production clutch had to be used (thus the demise of the dry clutch in these "production" based classes)? I have pics of Yamaha 7RR and GSXR Superbike dry clutch units from a few years back.

voxonda · « **Reply #37 on:** October 27, 2009, 08:05:47 AM »

In superbike the Ducati's and the '85/'86 GSX-R (limited edition) had a OEM dry.

turboguzzi · « **Reply #38 on:** October 27, 2009, 09:27:07 AM »

Quote from: MRieck on October 27, 2009, 07:07:11 AM

I thought WSB &AMA Superbike rules stated the production clutch had to be used (thus the demise of the dry clutch in these "production" based classes)? I have pics of Yamaha 7RR and GSXR Superbike dry clutch units from a few years back.

WSBK rules changed quite a bit since the days of the air-oil GSXR's and the ZX7RR, R7, etc and the big four dont produce homologation replicas anymore,

Yep, it'd be interesting to know which motogp are wet clutch, cant really think of one....

TG

ColinMc · « **Reply #39 on:** October 27, 2009, 10:59:59 AM »

Voxonda, so are you making a batch? Or just trying to see if you can make one that works and go from there? I was actually just thinking about this when I was looking at my 750k motor sitting next to my spare 748/853 ducati motor a couple weeks ago...

voxonda · « **Reply #40 on:** October 27, 2009, 11:07:02 AM »

Hey Colin,

There is a 'almost' working piece, and try to see wether there is enough 'real' interest to build/sell some.

Rob

simon#42 · « **Reply #41 on:** October 27, 2009, 12:02:39 PM »

the most up to date information on motogp bikes i have is last years motocourse and in 2008 ducati , yamaha, suzuki, honda and kawasaki all had dry clutches

voxonda · « **Reply #42 on:** October 27, 2009, 12:11:22 PM »

And they still have. Think with these powerplants you really need one.

simon#42 · « **Reply #43 on:** October 27, 2009, 12:33:25 PM »

better with any powerplant , looking forward to seeing your conversion with great interest voxonda

mlinder · « **Reply #44 on:** October 27, 2009, 12:36:22 PM »

Another plus is being able to use the lubricant of your choice.
Where slippery, additive laden modern oils can cause clutch slip with our wet clutches, with a dry clutch, you can run pretty much whatever you want.

lordmoonpie · « **Reply #45 on:** October 27, 2009, 01:08:55 PM »

Good spot Mark - best oils available don't work with the old plates (and I hate the fact the glue together after being sat for a while...)

mlinder · « **Reply #46 on:** October 27, 2009, 01:15:07 PM »

It's certainly something I'm considering looking into for the 350 racebike.

Wondering if I can make that 450 dry clutch work.

ColinMc · « **Reply #47 on:** October 27, 2009, 01:47:25 PM »

The one thing you do have to worry about is them rusting together if you use steel shim plates lol...that happened with my Ducati once after I washed it, then put it away right after for a week when I went on vacation. Switched to aluminum plates and shims after that to ease the wear and tear on the clutch basket as well. Would rather have the plate edges wear out instead of the much more expensive clutch basket.

MRieck · « **Reply #48 on:** October 27, 2009, 07:23:21 PM »

Some pics

MRieck · « **Reply #49 on:** October 27, 2009, 07:27:21 PM »

News:

Author Topic: Dry clutch on CB750 (Read 131672 times)