Tempest Scrambler gearbox sprocket

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39speedtwin
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Tempest Scrambler gearbox sprocket

Post by 39speedtwin »

Has anyone put a larger gearbox sprocket on a Tempest Scrambler?
If so how many teeth larger 1 or 2?
Any ideas where to buy one, there are plenty of Lexmoto ones on the internet ranging from 14 to 17 teeth, would one fit?
raffles
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Re: Tempest Scrambler gearbox sprocket

Post by raffles »

Who do you think will know ? Buy one and try it you tight old sod
Tony
39speedtwin
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Re: Tempest Scrambler gearbox sprocket

Post by 39speedtwin »

Tony,
The reason that I asked was someone may have done it, looking at the pictures of various sprockets they're similar but some centres are different.
Not being tight just being careful.
Dudley
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Re: Tempest Scrambler gearbox sprocket

Post by SPRIDDLER »

39speedtwin wrote:Has anyone put a larger gearbox sprocket on a Tempest Scrambler?
If so how many teeth larger 1 or 2?
Either size will be absolutely fine Diddley, as your bikes rarely seem to manage more than 200 yds before conking out. ;)
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Which taken at the flood............'
39speedtwin
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Re: Tempest Scrambler gearbox sprocket

Post by 39speedtwin »

That was 2018 Spriddles, 2019 no problems.
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REW
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Re: Tempest Scrambler gearbox sprocket

Post by REW »

Yeah, but it's 2020 Dudley!

Be aware that many modern bikes use electronics to calculate the road speed from the rotation speed of the gearbox sprocket. Go up 1 tooth and the speedo is often spot on accurate and the fuel injection computer still copes. 2 teeth and the speedo is way off and the fuel injection can't cope with the changed road speed/throttle position demands.

I would try 1 tooth first.
Ron

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39speedtwin
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Re: Tempest Scrambler gearbox sprocket

Post by 39speedtwin »

Speedometer runs from front wheel so wouldn't be affected, firstly find a suitable sprocket, hence the posting.
SPRIDDLER
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Re: Tempest Scrambler gearbox sprocket

Post by SPRIDDLER »

They only list the standard 14T front and 45T rear sprockets which are the same sizes that are fitted to the touring Tempest Roadster.
https://www.ajs-shop.co.uk/acatalog/Cha ... ets-2.html

How about calling them for advice, maybe it would be more practical to fit a smaller rear sprocket than the standard 45T one and then you could make less severe changes than with the 14T front?
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39speedtwin
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Re: Tempest Scrambler gearbox sprocket

Post by 39speedtwin »

Yes I had looked at the AJS website, which is why I asked the question Neville, as the engine is generic Yamaha there should be alternative sprockets available, just a matter of finding out to which bikes they were fitted. Much easier to change the front one than the rear.
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ajscomboman
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Re: Tempest Scrambler gearbox sprocket

Post by ajscomboman »

Dudley have a look at Chinese Motorcycle Parts Online or CMPO for short and search for Lextek front sprocket 428-15t 156fmi or by model Huoniao HN125-4F they look very very similar to the sprocket on the AJS website.
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