Author Topic: bob newby clutch  (Read 1814 times)

Offline rocker21

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bob newby clutch
« on: 03.11. 2016 12:56 »
any one had any experience of a bob newby clutch and belt drive? just got one to fit to my A7ss . i know they need some ventilation to make them work properly and wondered how best to do this while still keeping it looking original .
1960 A7SS, 1954 Ariel fieldmaster 500 twin, motoguzzi Monza 500, motoguzzi V7III special, Yamaha sr400 (2014)

Offline Klaus

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Re: bob newby clutch
« Reply #1 on: 03.11. 2016 13:12 »
any one had any experience of a bob newby clutch and belt drive? just got one to fit to my A7ss . i know they need some ventilation to make them work properly and wondered how best to do this while still keeping it looking original .

Hi rocker,

yes me *smile*
All my bikes run with BNR or NEB belt drives. No drag and slip,no oily spots easy to fit its plug and play.
Its a fairy tale that the belt need ventilation, doing this for years without and still runs with no problems.
It worth the money *wave*

cheers Klaus


If you think, everything is under control, you are not fast enought.

BSA DB34 Goldstar, BSA A10 Road Rocked, BSA A7 Shooting Star, BSA M33, BSA M24, Kawa W650

Offline rocker21

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Re: bob newby clutch
« Reply #2 on: 03.11. 2016 13:27 »
ta for that info Klaus
1960 A7SS, 1954 Ariel fieldmaster 500 twin, motoguzzi Monza 500, motoguzzi V7III special, Yamaha sr400 (2014)

Online Triton Thrasher

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Re: bob newby clutch
« Reply #3 on: 03.11. 2016 20:39 »
Another vote here, for what Klaus says.  I've been using a Synchroflex belt, like what NEB uses (I think) without case ventilation for many years.

If you chicken out and want discreet ventilation, make gaps in the primary case gasket.

Offline gt6uk

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Re: bob newby clutch
« Reply #4 on: 04.11. 2016 19:55 »
I recently fitted a Bob Newby clutch with belt drive and the advice he gave me was that no ventilation is needed for normal use. With having a rrt2 gearbox he suggested leaving the drain plug out and fitting small O rings over the screws before replacing the chain case which leaves a small gap which is not noticeable. They are not cheap but beautifully engineered and i think worth every penny.

Steve.

Offline danma

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Re: bob newby clutch
« Reply #5 on: 04.11. 2016 21:06 »
 I have one on another bike and can't fault it.

 Very robust, earlier this year I dropped a screwdriver while fiddling with the carbs and it fell onto the bottom belt run  and round the rear pulley till it hit the chain and battery carrier - horrendous noise. No damage to belt or pulley but side of battery carrier bent .

 It has also munched a glass fuse so keep important body parts well clear.

Offline Rocket Racer

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Re: bob newby clutch
« Reply #6 on: 06.11. 2016 02:59 »
I can recommend (BNR) them too, yes mine is ventilated and both inner and outer heavily cut away so I can strip very easily, but its also lugging two middle aged blokes off the line with a third wheel and no mercy given.
no problems in the six years its been fitted and raced.
But I'd agree with Klaus, ventilation not necessary.
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline rocker21

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Re: bob newby clutch
« Reply #7 on: 07.11. 2016 12:18 »
many thanks for all the useful comments, looks like my A7ss should not have any problems .
1960 A7SS, 1954 Ariel fieldmaster 500 twin, motoguzzi Monza 500, motoguzzi V7III special, Yamaha sr400 (2014)