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Fitting front sprocket on DB5R

 
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SpikeC



Joined: 20 Aug 2013
Posts: 450
Location: Portland, Oregon

PostPosted: Sun Mar 13, 2016 1:13 am    Post subject: Fitting front sprocket on DB5R Reply with quote

Hi guys, I am in the process of replacing my drive line and was wondering which way the front front sprocket should be fitted. When I took it off the short shoulder was toward the engine, but wear marks on the inboard side of the sprocket make me question whether the tall boss should be there. Of course the shop book does not address this!
Thanks for any eludication, Spike
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Spike C.
Portland, Oregon, USA
2008 Bimota DB5R
1965 Triumph T100SC
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SpikeC



Joined: 20 Aug 2013
Posts: 450
Location: Portland, Oregon

PostPosted: Sun Mar 13, 2016 2:07 am    Post subject: Reply with quote

The more that I look at the more it looks like the high boss goes against the engine. Which means that it was backward for the last 11000 miles!
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Spike C.
Portland, Oregon, USA
2008 Bimota DB5R
1965 Triumph T100SC
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SpikeC



Joined: 20 Aug 2013
Posts: 450
Location: Portland, Oregon

PostPosted: Thu Mar 17, 2016 6:23 pm    Post subject: Reply with quote

So has no one ridden their DB5R enough miles to need chain and sprocket replacement?
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Spike C.
Portland, Oregon, USA
2008 Bimota DB5R
1965 Triumph T100SC
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2bims



Joined: 03 Apr 2010
Posts: 7289

PostPosted: Fri Mar 18, 2016 8:34 am    Post subject: Reply with quote

'fraid so Spike.........although granted I do spread the mileage out over a few other Bims......have replaced the C&S on Db2 and Db4...and theres always an issue finding the correct front sprocket.....
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mick



Joined: 10 May 2015
Posts: 48

PostPosted: Fri Mar 18, 2016 4:12 pm    Post subject: Reply with quote

hi spike,
your engine sprocket was fitted correct :- the narrow shoulder to the engine,the large shoulder to the nut. I have just checked my db6 after i read your message.
ps I am on my second set of sprockets Very Happy
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SpikeC



Joined: 20 Aug 2013
Posts: 450
Location: Portland, Oregon

PostPosted: Sat Mar 19, 2016 7:05 pm    Post subject: Reply with quote

Thanks for the input mick, after close inspection I have decided that the wide shoulder has to be toward the engine on my bike. The front sprocket that I removed had excess wear on the engine side, and no wear on the outside surface. It was definitely not aligned with the rear sprocket, hastening wear of all of the components. How many miles are you getting out of a set mick?
I expect an alloy rear to wear faster than a steel one, but mine had 6 teeth broken off and the rest looking quite chewed up!
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Spike C.
Portland, Oregon, USA
2008 Bimota DB5R
1965 Triumph T100SC
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mick



Joined: 10 May 2015
Posts: 48

PostPosted: Sun Mar 20, 2016 12:03 pm    Post subject: Reply with quote

I have a bimota dbx and out of interest I checked the sprocket on that, and it is fitted the opposite way to the db6 ! so it looks like you could be right especially with the broken teeth. I changed the chain and sprockets at approx 10,000 miles, they were probably half worn but i had fitted lighter wheels and they came with a Talon rear sprocket, I also went down a tooth on the front sprocket.
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