The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Gearbox, Clutch, Primary => Topic started by: rocker21 on 03.11. 2016 12:56
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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 .
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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
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ta for that info Klaus
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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.
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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.
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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.
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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.
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many thanks for all the useful comments, looks like my A7ss should not have any problems .