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Triumph Pre unit - Belt Drive, any using one? #570268
11/03/14 10:13 pm
11/03/14 10:13 pm
Joined: Aug 2001
Posts: 770
Central Virginia
T120C Offline OP
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T120C  Offline OP
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Central Virginia
Getting to the clutch and primary side of the rebuild, any pros or cons for the Belt Drive??

Thanks in advance


Jack
1967 MGB Roadster..
1959 Bonnie
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Re: Triumph Pre unit - Belt Drive, any using one? [Re: NickL] #570282
11/03/14 10:53 pm
11/03/14 10:53 pm
Joined: Aug 2001
Posts: 6,739
Vermont
Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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Posts: 6,739
Vermont
Originally Posted By: NickL
Chains snap less often!



Splain yourself Ricky ?


There appears to be a lot of high quality belt drive units out there and can't imagine that the typical "old" bike owner is going to be putting so many miles on his bike as well as one that has so much torque that he should be worrying about snapping his primary drive belt.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Triumph Pre unit - Belt Drive, any using one? [Re: Jon W. Whitley] #570286
11/03/14 11:48 pm
11/03/14 11:48 pm
Joined: Aug 2011
Posts: 416
OZ
O
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OZ
If that were true then Bob Newby would have been out of business with his racing clutch and belt drives years ago.
I've been doing my level best to snap mine for the last two years and 5000 miles and so far the teeth still look brand new and the belt is only 1" wide.
Tyres are another matter as I've already destroyed two Avon Roadmaster rears in that time and mileage and just started on the third one so there's no lack of torque there.

davy

Re: Triumph Pre unit - Belt Drive, any using one? [Re: NickL] #570302
11/04/14 6:19 am
11/04/14 6:19 am
Joined: Aug 2011
Posts: 416
OZ
O
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OZ
When I was racing no-one ever broke a chain on the start line... we used to have to push start the buggers though.
Men were men back then.

davy

Re: Triumph Pre unit - Belt Drive, any using one? [Re: NickL] #570304
11/04/14 7:02 am
11/04/14 7:02 am
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Jon W. Whitley Online content

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Jon W. Whitley  Online Content

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You're talking about race bikes and that could be understandable but for the everyday 1959 T120 street rider type bike probably more than good to go.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project

Re: Triumph Pre unit - Belt Drive, any using one? [Re: T120C] #570305
11/04/14 7:35 am
11/04/14 7:35 am
Joined: Aug 2001
Posts: 770
Central Virginia
T120C Offline OP
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T120C  Offline OP
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Posts: 770
Central Virginia
Thanks for the info guys... I finally got to the primary side and was thinking about upgrades... so maybe this is not the sure fire upgrade I was thinking it was...


Jack
1967 MGB Roadster..
1959 Bonnie
Re: Triumph Pre unit - Belt Drive, any using one? [Re: NickL] #570330
11/04/14 10:47 am
11/04/14 10:47 am
Joined: Aug 2001
Posts: 770
Central Virginia
T120C Offline OP
BritBike Forum member
T120C  Offline OP
BritBike Forum member
Joined: Aug 2001
Posts: 770
Central Virginia
Originally Posted By: NickL
Originally Posted By: Jon W. Whitley
You're talking about race bikes and that could be understandable but for the everyday 1959 T120 street rider type bike probably more than good to go.




You don't have a '59 Bonny and not ride it like a racer! laughing


Man I would be happy to just ride this one down the street at any speed. This has been a long, long, long restoration...


Jack
1967 MGB Roadster..
1959 Bonnie
Re: Triumph Pre unit - Belt Drive, any using one? [Re: T120C] #570339
11/04/14 12:08 pm
11/04/14 12:08 pm
Joined: Dec 2004
Posts: 9,071
Scotland
kommando Online content
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kommando  Online Content
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Posts: 9,071
Scotland
For a top quality Primary Chain go to Andy the Chainman, no need for a belt drive.

Re: Triumph Pre unit - Belt Drive, any using one? [Re: T120C] #570365
11/04/14 2:17 pm
11/04/14 2:17 pm
Joined: Aug 2001
Posts: 7,026
scotland
triton thrasher Online content
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triton thrasher  Online Content
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scotland
There's something to be said for leaving a 1959 Bonneville original.

I use a Hayward belt. Hasn't given any problems.

Not sure if it's really an "upgrade" though. Doesn't need an oil bath, which is handy.


Amateur Loctite enthusiast.
Re: Triumph Pre unit - Belt Drive, any using one? [Re: triton thrasher] #570393
11/04/14 6:00 pm
11/04/14 6:00 pm
Joined: Aug 2011
Posts: 416
OZ
O
Old Cafe Racer Offline
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Old Cafe Racer  Offline
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O
Joined: Aug 2011
Posts: 416
OZ
The things I like about the belt drive are: It's quieter, requires no adjustment in service, runs clean and dry so no chance of an oil leak, I can run a sweet dry clutch and the belt makes the transmission smoother and less snatchy.

Another thing about people breaking belts is a belt requires about an inch of up and down play cold to allow for case and drive drum expansion when hot.
This appears excessive to the uninitiated and they set them too tight and then wonder why they snap at some point.

davy


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