What sprocket do I need?

[Zombient]

I'm trying to plan this all out here. Since I'm not savvy with the math behind all this, I'm turning to you all. I'll do my best to provide all the info that I have.

Engine: 13hp Predator, 1" shaft

Torque Converter: 40 series
http://www.gopowersports.com/40-series-torque-converter-kit-bolt-on/

Sprocket on TQ: 10T Sprocket for 40/41/420 chain

Axle: 1" thick

Tire: 15 x 6.00-6 Turf Tire (260116)

Rim: 6" x 5-1/4'' Rim with 1" Bore

Can't think of anything else to add. This kart came with a 6 horse Tec. Since I'm going to be throwing something bigger on it, do I need a different sprocket? Here's the original stock sprocket.

http://www.bmikarts.com/40-Sprocket-60T-with-1-Hub-_p_1415.html

 

[KartFab]

You could get up to a 15 tooth jackshaft sprocket with that engine and smaller tires.

Using the go kart speed calculator you can hear for s speed of up to 40 mph and be fine.

 

[OzFab]

I think you should be fine with that sprocket...

The issue I see is with the axle; it may be ok but, if I was using an engine with a 1" shaft, I would want my axle to be bigger... JMO

 

[Zombient]

Alright, so assuming that my axle is okay, what if I used the 15 tooth sprocket for the jackshaft, a #40,#41 & #420 Chain 48 tooth sprocket, same tires as before? Using the calculator, it says that it would put me right at 50mph. That's plenty quick enough for this offroading kart.

I know I'd lose a little bit of torque, but would that be too much lost? I plan on doing a few basic upgrades to the engine, so I think I'll gain some torque back.

And thank you guys for the help.

 

[itsid]

Sorry.. NO f* way!

no matter what you do, a gear ratio of 3.2:1 will never work, not with 15" wheels, not with 11" wheels

Anything below 4.8:1 will fail on 15" wheels. (48T axle, 10T jackshaft)

if you're using the calculator on diygk main site, just ignore the gear ratio as soon as it's above 38mph (that's about the highest achievable number with a 3600rpm engine without destroying a belt of cent clutch)

'sid