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Old 09-30-2019, 01:35 PM
Tstickcrowley Tstickcrowley is offline
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Default Go kart clutch and gearing

I know I have the gearing wrong. I have a 6.5 hp predator engine first of all. Then a chain clutch. 10t on the clutch that runs to a jackshaft sprocket with 12t with another 12t sprocket beside it that runs to the axle which is 62t. Which direction should I go to stop the smoking clutch. I should up the jackshaft sprocket correct? I have spare sprockets and clutch. Thatís why I set it up like this to get a good amount of options for speed vs acceleration. Obviously I should have educated myself more. Thanks for any help
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Old 09-30-2019, 01:57 PM
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Can you tell us what type of go kart this is, and what outside diameter your tires are?

Thanks.
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Old 09-30-2019, 02:05 PM
Tstickcrowley Tstickcrowley is offline
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Yeah sorry they are 18s it’s an old manco dingo. If I’m right I should be running a 10t off clutch to 18t on jackshaft then a 10t or 12t to the axle which is 60 I was wrong before. My daughter weighs about 80lbs.
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Old 09-30-2019, 02:23 PM
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That equates out to a 6/1 gear ratio, too high for an 18" Predator Dingo.
A 10T clutch sprocket to 18T jackshaft input, 12T jackshaft output going to a 60T clutch will give you a 9/1 gear ratio, which is plenty low for 18" tires, and with the governed Predator, should go 21 mph. Sounds good to me. I recommend the 10/18/12/60 setup.
The setup I just described with a 10T jackshaft output instead would give you a stump pulling 10.8/1 with a top speed of 18 mph.
It's funny, because with my Starbird, I can get away with a 5.5/1 gear ratio with 13" tires, and still peel out and get 25 mph. But that's with a "HiPo" Briggs flathead that makes gobs of torque compared to a stock Predator 212 and much smaller tires.

Now that we've figured out a good gear ratio, can we see some pics of your kart?
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Old 10-01-2019, 01:47 AM
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Quote:
Originally Posted by JTSpeedDemon View Post
That equates out to a 6/1 gear ratio, too high for an 18" Predator Dingo.
A 10T clutch sprocket to 18T jackshaft input, 12T jackshaft output going to a 60T clutch will give you a 9/1 gear ratio, which is plenty low for 18" tires, and with the governed Predator, should go 21 mph. Sounds good to me. I recommend the 10/18/12/60 setup.
The setup I just described with a 10T jackshaft output instead would give you a stump pulling 10.8/1 with a top speed of 18 mph.
It's funny, because with my Starbird, I can get away with a 5.5/1 gear ratio with 13" tires, and still peel out and get 25 mph. But that's with a "HiPo" Briggs flathead that makes gobs of torque compared to a stock Predator 212 and much smaller tires.

Now that we've figured out a good gear ratio, can we see some pics of your kart?
I agree with this. You are geared too high for the diameter tyres that you have. You need at least an 8 or a 10:1 gear ratio. You will have a lot more torque but will have a slower top speed.
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