hello!!

[nick4360]

Hello I am building my first go kart and am having problems with gear ratio XD...



my clutch is 17 tooth 35 chain

my rear sprocket is 60 tooth

my tire size is 20"

i know this is way off but i have no clue what to change first
it looks like i need to change everything



the engine i have is http://www.maxtool.com/xp16hpe-duromax-xp16hpe

---------- Post added at 11:56 AM ---------- Previous post was at 11:42 AM ----------

I've heard i need around 7:1 ratio but that seems slow i was thinking 5:1 with 15"

I'd like it to be around 30 mph but fast as **** out of the gate

 

[utahoutdoors]

With that 60 tooth how much clearance do you have. I believe you going need to use
a JS specially using the #35. But I let the others experts chime in on this.

 

[nick4360]

i can have as much clearance as i want I'm still building the frame and what is the purpose of a
jack shaft?

 

[mckutzy]

A jack shaft is to redirect the chain travel on one side or another of a wheel, to mate with other drive components parallel to each other, or to have a compound gearing setup when ever a straight and simple isnt available/required/unwanted or not enough space/ground clearance.

 

[landuse]

5:1 with 15" tyres is not going to work either. If you want big tyres, you are going to have to gear low and sacrifice speed. That is pretty much it. I would get a 72T axle sprocket and the smallest clutch sprocket available

 

[OzFab]

Being a 16hp engine with a 1" PTO shaft, 17t probably is the smallest clutch sprocket...

I'd like it to be around 30 mph but fast as **** out of the gate

That's doable... with a 7:1 gear ratio & a torque converter; you won't get the best of both worlds with a centrifugal clutch; great acceleration out the gate will require a lower ratio, which will decrease top speed...