40 series Cvt help

[Gokart tractor]

I have a complicated setup here…. Lol
18hp vtwin to 40 series cvt with a 50 on the driven and 12 on an FNR that is 21.6-1 from a lawn tractor (which is already difficult to figure out enough) lol
with this all calculated says I have 5.18-1 and I’m on roughly 18” tire diameter so it says I should get about 37. Problem is the driven pulley on the Cvt will not shift under load but will when it’s on jacks. What’s the best way to fix this?
Forgot to mention I’m getting 10mph and the motor is ungoverned

 

[Hellion]

Pics or it didn't happen!

 

[Gokart tractor]

View attachment IMG_7326.jpeg

 

[Gokart tractor]

Update: I switched the 50 tooth a 40 too raise the ratio or however you say it lol too see if it would turn easier and maybe open up, I couldn’t see the Cvt but I’m prettt sure it didn’t because it dropped from 10mph too 7 so I’m guessing not the answer lol. The only other thing I can think of is putting the 50 back on and adjusting the spring in the Cvt

 

[Denny]

Swap the sprockets around 10 tooth on the driven and 50 tooth on the axle. You have them backwards now.

 

[Gokart tractor]

I tried that first I had about 2mph due too the tall rear end.

 

[Gokart tractor]

Update: I realized now that the driver and the driven are not shifting under load

 

[Denny]

That’s because you can’t get enough rpm out of them.

 

[Gokart tractor]

That’s because you can’t get enough rpm out of them.

What would cause that?

 

[Gokart tractor]

What would cause that?

Or how do I fix it lol

 

[Denny]

10 tooth on the driven and 50 tooth on the axle.

 

[Gokart tractor]

10 tooth on the driven and 50 tooth on the axle.

I did 10 on the clutch and 40 on the back and it went like 2mph

 

[Denny]

What does the rear end look like? What is its ratio?

 

[Gokart tractor]

What does the rear end look like? What is its ratio?

It’s a lawn tractor fnr trans axel, 21.6-1 lol

 

[Edwin Spangler]

It’s a lawn tractor fnr trans axel, 21.6-1 lol

I have a similar trans driven mower. Since there is such a drastic reduction, we used something like a 12" pulley driving a 4" pulley on the trans which is about 20:1.

Probably going to have to go through some trial and error because I bet there is also a CVT mechanism on top of that transmission?

 

[ezcome-ezgo]

This is a ratio nightmare.

 

[Denny]

Is it manual transmission or hydrostatic?

 

[Gokart tractor]

I have a similar trans driven mower. Since there is such a drastic reduction, we used something like a 12" pulley driving a 4" pulley on the trans which is about 20:1.

Probably going to have to go through some trial and error because I bet there is also a CVT mechanism on top of that transmission?

Cvt from motor to jack shaft with a 50 tooth a 12 tooth on the trans axel which is just a single speed standard fnr trans axle out of a mower

 

[Gokart tractor]

Is it manual transmission or hydrostatic?

Single speed fnr from a vari drive mower

 

[Gokart tractor]

Will this work or how can I make this orientation work