Technical Sprocket size

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Irishron

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Hello everyone.
My name is Ron and am a Dutch guy living in west of ireland.

I decided to build a go cart with my down syndrome cousin.

I have bought a Pacini four stroke engine which is 7hp and 3600 Rpm.

Clutch is 10tooth and holds a 420 chain.i was told to go a 6to1 Ratio sprockets

By my calculations if I get s 60 tooth rear sprocket my speed would only be around 32km

What if I use. 35 tooth sprocket, would I still have enough torque?

Thank you.
Ron
 
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d-i-y82

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Hello everyone.
My name is Ron and am a Dutch guy living in west of ireland.

I decided to build a go cart with my down syndrome cousin.

I have bought a Pacini four stroke engine which is 7hp and 3600 Rpm.

Clutch is 10tooth and holds a 420 chain.i was told to go a 6to1 Ratio sprockets

By my calculations if I get s 60 tooth rear sprocket my speed would only be around 32km

What if I use. 35 tooth sprocket, would I still have enough torque?

Thank you.
Ron
Yes if you are going to run on tarmac with 11 inch tyres and your kart /driver is not too heavy.

6-1 would be more suited to off road running but a 60t 420 sprocket would be almost scraping the ground on 11 inch tyres.
 
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Adam

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Below will help you, we have an in house ratio calculator. 😁

 

Irishron

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Sligo ireland
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Ron
Thank you
 
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Adam

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1,253
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372
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24
Age
31
Location
Essex - UK
Name
James 'Adam' Pell
Skill Level
Amateur
Class
Senior Rotax 177
Engine
Grice Racing Engines
Chassis
Tony Kart 401R
Team
J. A. Pell & Son Motorsport
Facebook
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