CVT transmission ratio for Honda GX-35

[Otto Neumann]

Sounds good, good luck with your biuld..............Curt

Thanks Curt,I will start the build once I get all the pieces at once,and I'll keep you updated about it! ^^

 

[5-7HEAVEN]

Sorry, your 3.67:1 gear ratio is WAY off.

You will burn out the clutch, and your bike will not move from a standstill.

You need to raise your gear ratio 400%.
Not 4%, or 40%, but 400%.

Optimal gearing for a single sprocket and this engine is about 18.75:1.

 

[5-7HEAVEN]

You MUST use a transmission or a CVT,
in conjunction with a jackshaft to attain low enough gear ratios.

The pocket bike 5:1 transmission is plenty strong for your needs.
However, it will reverse engine rotation.
That means your engine's chain will mount on the right side.

This may be a good thing.
That way, you can connect to the bike's
mulit-speed derailleur and cassette and get
awesome multiple gear ratios.

Which might be a little bit more than
what you expected your build to encompass.

You'll learn more about this
multi-speed shift kit option as
you spend more time in this forum.

You will not get to 60mph on flat land with this engine and any type of gearing.

Shoot for 35mph, which is possible.

Good luck.

 

[Otto Neumann]

Sorry, your 3.67:1 gear ratio is WAY off.

You will burn out the clutch, and your bike will not move from a standstill.

You need to raise your gear ratio 400%.
Not 4%, or 40%, but 400%.

Optimal gearing for a single sprocket and this engine is about 18.75:1.

Hi!
It will happen even with the bike already in motion? My initial idea were of using the engine when the bike is already at a reasonable speed,obtainded by an initial accelleration with the pedals and only then to accellerate with the engine

 

[Otto Neumann]

You MUST use a transmission or a CVT,
in conjunction with a jackshaft to attain low enough gear ratios.

The pocket bike 5:1 transmission is plenty strong for your needs.
However, it will reverse engine rotation.
That means your engine's chain will mount on the right side.

This may be a good thing.
That way, you can connect to the bike's
mulit-speed derailleur and cassette and get
awesome multiple gear ratios.

Which might be a little bit more than
what you expected your build to encompass.

You'll learn more about this
multi-speed shift kit option as
you spend more time in this forum.

You will not get to 60mph on flat land with this engine and any type of gearing.

Shoot for 35mph, which is possible.

Good luck.

The 5:1 transmission is actually under my choice due to its ratio,mounting to the right size the engine it's a perfect thing to me,as I'm left I can start more comfortably the engine.
I wanted a jackshaft,and I know about this shift,but I got a limited budget

 

[5-7HEAVEN]

Either way you run the chain will be a project.

It will not be as easy as installing a China Girl engine.

The bottom line is that you'll need 18.75:1 single gear ratio.
(I'm quoting that from www.staton-inc.com,
a major engine-drive kits vendor.)

You COULD mount a 3:1 transmission onto the engine.
Carefully position the engine on its flat mounting plate,
so that the transmission gear aligns with
where your rear wheel sprocket will be.

That way, you won't need a jackshaft.

Use a T8F 6-pinion sprocket with the least amount of teeth.

The smallest one I could find had 11 teeth.
The largest T8F rear wheel sprocket I use have 72 teeth.
Another member found 74-tooth T8F sprockets.

You'd need a 65-tooth rear sprocket and an 11t front sprocket.

That should give you a gear ratio of 18.85:1.

 

[Otto Neumann]

Either way you run the chain will be a project.

It will not be as easy as installing a China Girl engine.

The bottom line is that you'll need 18.75:1 single gear ratio.
(I'm quoting that from www.staton-inc.com,
a major engine-drive kits vendor.)

You COULD mount a 3:1 transmission onto the engine.
Carefully position the engine on its flat mounting plate,
so that the transmission gear aligns with
where your rear wheel sprocket will be.

That way, you won't need a jackshaft.

Use a T8F 6-pinion sprocket with the least amount of teeth.

The smallest one I could find had 11 teeth.
The largest T8F rear wheel sprocket I use have 72 teeth.
Another member found 74-tooth T8F sprockets.

You'd need a 65-tooth rear sprocket and an 11t front sprocket.

That should give you a gear ratio of 18.85:1.

I'll keep it in mind,
Oh yes,you won't find a T8F sprocket smaller than the 11T,
My bike has the transmission mechanism and the cassette on the right side,the left one it's free,it can be done.
I've to find a way to recycle my 44T sprocket that I ordered..
I can turn it into a neat clock