Tempest Scrambler gearbox sprocket

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Tempest Scrambler gearbox sprocket

Postby 39speedtwin » Wed Jan 15, 2020 4:27 pm

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?

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Re: Tempest Scrambler gearbox sprocket

Postby raffles » Wed Jan 15, 2020 7:09 pm

Who do you think will know ? Buy one and try it you tight old sod
Tony

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Re: Tempest Scrambler gearbox sprocket

Postby 39speedtwin » Wed Jan 15, 2020 7:23 pm

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.
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Re: Tempest Scrambler gearbox sprocket

Postby SPRIDDLER » Wed Jan 15, 2020 9:36 pm

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. ;)
I poke badgers with spoons.

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Re: Tempest Scrambler gearbox sprocket

Postby 39speedtwin » Thu Jan 16, 2020 12:48 pm

That was 2018 Spriddles, 2019 no problems.

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Re: Tempest Scrambler gearbox sprocket

Postby REW » Thu Jan 16, 2020 10:44 pm

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

1951 Matchless G3L, thumping round the Durham Dales

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Re: Tempest Scrambler gearbox sprocket

Postby 39speedtwin » Fri Jan 17, 2020 10:12 am

Speedometer runs from front wheel so wouldn’t be affected, firstly find a suitable sprocket, hence the posting.

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Re: Tempest Scrambler gearbox sprocket

Postby SPRIDDLER » Fri Jan 17, 2020 12:20 pm

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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Re: Tempest Scrambler gearbox sprocket

Postby 39speedtwin » Fri Jan 17, 2020 4:09 pm

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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Re: Tempest Scrambler gearbox sprocket

Postby ajscomboman » Fri Jan 17, 2020 4:27 pm

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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