GPZ305 belt drive; What's it like?

Vincent · Banned Joined: 16 Oct 2006 Karma :

Can anyone please tell me what the front end of the GPZ305 belt drive looks like? Does it have a front pulley that's a similar size to a front sprocket:?: Does it fit on a "normal" type drive shaft:?: Has anyone heard of any conversions on bikes other than big cruisers:?:

Hanx

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

What are you trying to do? Convert something to belt drive or convert a 305 to chain drive?

Vincent · Banned Joined: 16 Oct 2006 Karma :

I'm looking at converting chain to belt, out of interest. I was wondering if the gear off a GPZ, or any other mass produced belt drive bike, could be made to fit a similar sized bike.

hedjehog · Nova Slayer Joined: 19 Nov 2005 Karma :

Hi Vincent,

These are from parts diagrams of the GPz305 B1

Front
https://img297.imageshack.us/img297/2496/frontxj6.jpg

Rear
https://img120.imageshack.us/img120/4527/rearkg1.jpg

Thumbs Up

hedjehog
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Vincent · Banned Joined: 16 Oct 2006 Karma :

Excellent, thanks hedjehog, just what I was looking for Thumbs Up

I seem to find conflicting views about belt drives on the net, some people say that they are no use for high powered bikes but they do seem to be a good alternative to C&S, low maintainance and low cost.
However, I have overlooked the biggest problem in doing a conversion, which is how to get the belt to run through the braced swing arm I'm using Confused

Shame realy, I quite fancied the idea Sad

crazymotorbik... · Nearly there... Joined: 05 Mar 2006 Karma :

Hey,

Did read correctly? Your planning on converting from chain to belt?

If so please please can i buy the bits of you to convert mine from belt to chain?

Cheers,
Shaun.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

plus if they break, you dont get a chunk of metal in the back of the leg Very Happy

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stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

They do squeak in an annoying fashion though.

Vincent · Banned Joined: 16 Oct 2006 Karma :

I can't do it on the bike I'm working on at the moment because of the aforementioned swing arm problem, but will definately look into it more next time. I rode shaft drive bikes for years, mainly European and have just gone back to a chain drive bike. I'd forgotten what an expensive pain in the arse it is. Esp with Kevlar belts getting to be a bit more affordable, can't believe kits for mid-sized sports bikes aren't more readily available. How wide is the belt on the Buell Question

Any idea.

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

About this wide, which doesn't look very wide at all. Maybe an inch at most.
https://www.kawachi.zaq.ne.jp/dpcdg605/sindokei/buell/belt.jpg

Vincent · Banned Joined: 16 Oct 2006 Karma :

For a mid-sized bike say 350 - 600 i would have thought half that would suffice. The Buell rear pulley looks a lot more like a sprocket then any other one I've seen. Once you have the outer rim, I would have thought you could just cut down the bikes sprocket to fit inside and weld it in, obviously it would have to be a bl**dy good weld. The centre of the belt should be where the centre of the chain was. Front pulleys are usualy about twice the width of the rear ones, so allignment shouldn't be too problematic. Finding a pulley that would fit your drive shaft might be a bit of a game. I wonder what the wear rate is like on bike pulleys/belts. It looks like the top brace on the Buell swing arm comes off. That's got me thinking again Thumbs Up

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

For life expectancy, think on the GPZ305 they were generally held to last ~15000, about same as a chain (with a similar replacement cost to a chain and sprocket kit, but more time to fit). But they also tended to suddenly fail (teeth coming off the belt).

Suspect it is torque that would kill them rather than power, so quite likely you are correct that a sports 600 could use a smaller belt. However I am surprised a belt that narrow (compared to a cam belt) can put up with that kind of torque in such a poor environment.

All the best

Keith
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Vincent · Banned Joined: 16 Oct 2006 Karma :

BTW; Are all Buells R/H Drive Question

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Wasnt' going to shoot at the belt, or ride it on a tour of interesting war zones Wink

. I would be a touch more concerned about the teeth staying on the belt.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Vincent · Banned Joined: 16 Oct 2006 Karma :

Norfolk N Chance · Two Stroke Sniffer Joined: 10 Feb 2007 Karma :

up to now ive done 6500 mile on my GPZ 305 belt
with no problems apart from the odd squeek when its wet but thats normal with a belt drive

biggest problem for belts .........is if you get a stone stuck it will rip through the belt

good point is you dont have to maintain it like a chain
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