Modify a 49cc CVT for Go Kart/Electric Uses?

[oscaryu1]

And Tyler your motor's not coming

 

[Rotore]

you mena like making your own go kart cvt?

 

[oscaryu1]

Yes, that thing looks similar to a Comet-ish type of thing, why wouldn't it work?

 

[Jblankster]

what motor it off of?

my worry is it wont be able to hold the HP

 

[oscaryu1]

It's off a little 2.5HP 49cc 2 stroke lol.

They can rev 7,000 stock, so shouldn't worry about the RPMs.

However, they have enough mods on these to make a good 5HP or more... lightened flywheels, full circle crankshafts, big bore kits, ported cylinders, huge pipes with expansion chambers, advanced timing keys, racing carburetors...

Blah. So it might not handle a big engine, but a small 5-7HP I'm pretty sure it can handle it (just take it easy on the throttle).

I'm looking for one to place on my scooter lol, and from what I know, that can't be a good thing (electric motors = instananeous torque)

 

[mike75925]

i have one of the 90cc gy6 motors with that style tranny. tranny's are pretty solid, the rest of the vehicles they come on are sub par. some have reverse.

 

[oscaryu1]

Main thing I dislike is they contain a gear reduction unit where the sprocket is.

It's virtually identical to the top of a X1/X2 gear reduction unit, just integrated into a CVT.

I'm thinking of getting one, choppin' that part off, and run it like that with a (obviously) smaller sprocket...

For my electric "drag bike" I'm trying to make

 

[mike75925]

why chop it? remove the reduction gear and use a lovejoy or similar coupling to the engine/motor

 

[Raywelder]

thats cool, Can those be had for fairly cheap?

 

[Rotore]

my worry is it wont be able to hold the HP

thats why

 

[mike75925]

oscar is this for your race against the 70 pound kid?

 

[oscaryu1]

Oh no, I gave him a 15 second handicap and beat him in about 30 seconds.

Heck, 3 days after he bought it, he came to me and asked me to swap out his batteries - they were already dead.

Batteries made in 2004. He bought the bike in 2009. Lol.

 

[mike75925]

he'll learn. did you run all those batteries you were talking about? you sure put a whoopin on him. sheez how long was the course?

 

[jr dragster T]

I dont think that converter will hold up to a 3-5 HP 4 stroke engine. When installed on a 2 stroke scooter the power is much smoother and lots of clutch slippage on a small 2 stroke. Oscar you told me my 250 motor was in the mail! Also I dont see a electric motor turning 2700 RPM enough to just barely stall the clutch let alone shift out.

 

[mike75925]

the power may be smoother, but it vibrates a whole lot more. tyler more power!

 

[jr dragster T]

Lol, Whats the belt width on that? Sheives symetrical or asymetrical? I need this information to give you a good baseline.

 

[oscaryu1]

No idea D

Actually, the belts are about $10 each. That's why me likey. $60 for the CVT, and $10 for belts D

And I'm overvolting and oil cooling them at 60V, remember?

 

[jr dragster T]

Tell me on MSN about the oil cooling plan. Your going to need ALOT of rpm for this to work.

 

[mike75925]

these tav setups are normally sym, and the comet belts are really close in size. at least mine are

 

[oscaryu1]

To bypass the gear reduction, I'm thinking of running a large sprocket on it instead of the 20 tooth stock (don't need gear reduction TBH)