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Old 11-01-2019, 07:04 PM
qbert81 qbert81 is offline
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Default Worn out clutch or something else?

I just finished fixing the engine of an old go kart and rode it around and there is still one problem. When I gun the throttle, the thing takes really long to accelerate, but if the wheels are turned, it wont accelerate at all. The kart needs to be facing straight forward to have a chance at accelerating. The carburetor on the Tecumseh 5hp is getting full throttle and it reaches a max speed around mph. Do you guys think the centrifugal clutch is worn out or is it something else?
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Old 11-01-2019, 07:16 PM
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What's the tooth count on the sprocket and clutch? And what's the rear tire diameter?
Sounds like a gearing issue.
Also, did you oil the clutch bushing recently?
Let's see some pics of the kart. And what's the top speed? Ya missed that.
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Old 11-01-2019, 08:00 PM
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Clutch is 10 tooth and sprocket is 52 tooth. Wheels are 12.5 inch diameter. Engine is 5hp techumseh and max speed I got so far was a bit above 30
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Old 11-01-2019, 08:12 PM
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That gearing is high but still reasonable.
My kart has slightly lower gearing and will spin the tires when wet or on concrete.
So it is most likely a burnt out clutch, possibly with engine issues.
Make sure your carb is clean and you're getting full throttle.
Replace the clutch and report back.
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Old 11-04-2019, 12:23 AM
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Quote:
Originally Posted by JTSpeedDemon View Post
That gearing is high but still reasonable.
My kart has slightly lower gearing and will spin the tires when wet or on concrete.
So it is most likely a burnt out clutch, possibly with engine issues.
Make sure your carb is clean and you're getting full throttle.
Replace the clutch and report back.
All of these things.....

Gearing is slightly high, but not high enough to be as severe as what you are describing
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Old 11-04-2019, 06:21 AM
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Quote:
Originally Posted by landuse View Post
Gearing is slightly high, but not high enough to be as severe as what you are describing
Unless the kart and rider combo weighs in at 300 lbs or more
(at which point the ratio should be closer to 8:1 already)

Talking about ratios;
frankly, something is wrong here..

for 30mph you'll need 15" wheels on that ratio
or 12.5" wheels on 4.4:1 gear ratio
or more than 4200 rpm

and if the engine is struggling to take off,
you cannot hit 4k+ rpms at all... I doubt it'd rev to 3600 tbh
So would you please read the tyre side wall numbers for us
and recount the teeth on all sprockets?

And please post a pic, thank you

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Old 11-04-2019, 07:08 AM
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Quote:
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Unless the kart and rider combo weighs in at 300 lbs or more
(at which point the ratio should be closer to 8:1 already)

'sid
Yup....I didn't count in the weight
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