Bimota Forum

quikduk

Hi all! Sorry I have been away for a while but work, two in college, more work, flooring remodel at home, etc. just seem to get in the way of e-browsing and forum participation.

Hell I am only awake now at 10:01 PST as I had too much coffee late today.

Back to my conundrum. I just replaced my tires with Michelin Road 5's for a pretty penny and during disassembly, I noticed that the staked master link on my chain was missing the 4 o-rings and was wobbly. When I pulled the rear sprocket, the interior face was worn to half its original thickness and the teeth were starting to "pull" forward. The aluminum appears very soft and while the chain is in excellent condition as is the countershaft sprocket, I can't say the same for the rear or master link.

I was looking at BellissiMoto but nowhere do they give detailed specs. Mine are as follows:

- 100mm on center between mounting nuts (x6)
- 80mm diameter open hole for carrier pass through
- 520 pitch
- 40 tooth (I might go to a 41)

Does anyone know if there is a comparable Ducati model that this sprocket fits so I can order a replacement? I have purchased a replacement staked master link as well as the breaker/staker tools but just need a better rear sprocket.

All help is appreciated.

Bud977 · Joined: 03 Mar 2013 Posts: 525 Location: Sydney

How about this one? Looks like it would fit.

https://www.ebay.ie/itm/JT-Rear-Sprocket-41T-520P-JTR819-2-41-Steel-Suzuki-TU-250-X-Volty-1997-/332770760278

quikduk · Posted: Sun Apr 12, 2020 8:51 pm Post subject:

Bud977,

Thanks for that link. I had called every company I knew of as well as contacted JT but no one called/emailed back. This was before this current pandemic had really gotten off the ground so there should have been no reason for the lack of responses.

Not one to give up, I finally contacted Vortex sprockets and told them what I needed. Their response was legendary.

"Sure no problem, that is a part #825A-40 and we'll have it cut and shipped tomorrow morning. It should take about 3 minutes to cut out of the blank." It cost about $62 USD so very reasonable for a 6061 billet aluminum sprocket IMHO.

WTH??? Awesome. They will be my go-to now. They can make anything you want. Give them the specs and it ships the next weekday.

I got it and it looks amazing. I already got everything mounted including the new Michelin Road 5's and 90 degree billet valve stems and just the other day cleaned and reinstalled the chain with the new staked master link. This link might be a little tight but time will tell if it is OK or if I have to replace the chain. If so, then I might have Vortex make me a lightened steel rear depending on the wear.

Bud977 · Joined: 03 Mar 2013 Posts: 525 Location: Sydney

Glad you got it sorted. Vortex sounds like the go for sprockets.

glened · Joined: 15 Aug 2013 Posts: 135 Location: Lancashire

I have gone through several sprockets starting with original steel sprocket then I tried an aluminium replacement which very quickly wore out. Changed the wheels to BST and they supplied "Talon" I have used three of those, and they all wore the same way with hooked teeth and the pitch of the teeth being stretched. The bike has now covered about 23,000 miles, I have now gat supersprox aluminium sprocket with a steel outer edge, not done any miles since getting knocked of last year. It has covered about 1000 miles and still looks ok.
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Bimota DB10, Suzuki TS250, Kawasaki Z1A, T120 Trton, AJS650, KTM690 Duke

brian · Joined: 22 Aug 2011 Posts: 3769 Location: Australia

2bims · Joined: 03 Apr 2010 Posts: 7289

brian · Joined: 22 Aug 2011 Posts: 3769 Location: Australia

vort28 · Joined: 22 Mar 2010 Posts: 2194 Location: Northwest , UK

I have a supersprox on the Tesi 3DN, I'll check out the dimensions for you as got OZ wheels on it.