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Old 06-04-2012, 08:50 PM
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Default 9t torque converter what rear sprocket?

I have a comet torque converter 9t for my mini bike how many tooth should my rear sprocket have? 60t or 70t , my engine is a b&s 8HP.. Thanks
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Old 06-04-2012, 09:35 PM
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Will a 62t or 63t
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Old 06-05-2012, 12:39 AM
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Quote:
Originally Posted by invader gokart View Post
I have a comet torque converter 9t for my mini bike how many tooth should my rear sprocket have? 60t or 70t , my engine is a b&s 8HP.. Thanks
Quote:
Originally Posted by invader gokart View Post
Will a 62t or 63t
Those sprockets should be fine. You could probably also go down to somewhere round a 50T sprocket. You can generally gear a little higher if you have a TC.

You can have a look at this thread to get some idea.

http://www.diygokarts.com/vb/showthread.php?t=16353

Your gearing would be (axle sprocket/9T) = ?:1
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Old 06-11-2012, 02:13 AM
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Ok thanks for reply.. Im actually goin with a tc. 9t and a jackshaft plus the 60t axle sprocket,.. What would be good for my jackshaft how many tooth ?
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Old 06-11-2012, 02:14 AM
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How big are your rear tyres.
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Old 06-11-2012, 02:17 AM
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10”
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Old 06-11-2012, 02:31 AM
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I would like for my engine to Get good torque meaning take off and good to speed,.. Basically I want it pretty evened out as possible. Thanks for the help
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Old 06-11-2012, 04:03 AM
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Correct me if I'm wrong (torque converters are one thing I know very little about) but isn't the driven on a jackshaft with the 9t?
If so then all you need to do is go direct to the rear axle.
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Old 06-11-2012, 04:38 AM
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You do realise your rear sprocket would be 9.5" if a 60t and #40 chain, right?
You can gear for much more speed.
With a 70t (too large to fit) you would only go 14mph @3600rpm.
I suggest you get a 10t sprocket for your TC, because axle sprockets are hard to find in lower teeth than 54 with #40 chain. I have a 10t comet sprocket for sale if you want it.
You may have better luck with #35 though. The racers use #35 a lot so there are a wide range of sprocket sizes available. You can get a range of #40 sprockets here, but they are expensive!
Or even get bigger rear tyres.
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Old 06-11-2012, 09:08 AM
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Thanks for the help.. So run a #35 chain with 10t on my tc how bout my jackshaft? 10t as well? I need a js. To fit my rear wheel better ..
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Old 06-11-2012, 09:12 AM
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Sorry I didint mention its for my mini chopper project
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Old 06-11-2012, 01:39 PM
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You have a jackshaft? sorry missed that.
Run #40 from engine to jackshaft. Use the 9t on your tc since you have it.
How big is your jackshaft?
Then run #35 from jackshaft to wheel, you can get a large #35 sprocket for the jackshaft hereYou can get nice #35 sprockets here and the smallest is just over 6"

What top speed are you heading for?
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Old 06-11-2012, 04:27 PM
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Ok so my tc has 9t to js 10t #40 then 10t to rear axle 60t #35 is thar a good set up?? Im looking fo good take off and good top speed im, trying to get as much HP and speed out of my engine..
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Old 06-11-2012, 05:59 PM
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Why not just go from the 9t to a 60t on the axle, that would be spot on
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Old 06-11-2012, 06:57 PM
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I need a jackshaft because my tc to my rear axle don't line up
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Old 06-11-2012, 09:39 PM
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Bump..
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Old 06-12-2012, 01:01 AM
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what you fellas think on engine gear 9t js in 10t, js out 10 rear axle 43t..?? need help as im getting parts tommorow
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Old 06-12-2012, 01:16 AM
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That gives you a ratio of 4.77:1. With a TC I think it should be OK
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Old 06-12-2012, 02:28 AM
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If you answered my questions I could help you more...
That gives you 22mph @3600rpm. Helluva lot of torque.
I would go for more like 3.6:1 which is achievable by 9t:10t then 13t: 43t
You would get 30mph. What sorta terrain are you on?
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Old 06-12-2012, 09:49 AM
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Ok chez 08, im getting my js today so I need a good set up so I won't buy more sprockets down the road, so my top speed i'm trying achieve is about 40, 44mph.. Im goin to be in even road, thanks
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