Visit the Team Iceshanty Proshop
The difference in 30 and 40 series torque converter,one is for lighter duty and smaller engine hp and the 40 is heavy duty and for larger hp motors.the big gear will go where the large pulley is on the sled.i have not built one yet but i will be using a predator 6.5 engine to power mine and should be fine if geared right.electric start would be nice on the larger predator engines.i have everything to build one but the snowmobile drivetrain sitting here because i build alot of old school minibikes.
Nice! Hopefully you post pictures as you go along. What made you decide on the 6.5 hp motor? I’m guessing you’ll be using the 30 series clutch with that size engine?
ive already got a few new predator 6.5 engines.also tecumseh and briggs laying around.yeah im starting with 30 torque converters just because i have them too.think you remove the suspension for better steering and traction.i did get a 1990 arctic cat cougar sled for free last week but it is still decent and i had it running already so im still looking for a drivetrain for a snowdog.i have all the other parts here except the primary drive sprocket.
How many tooth sprocket are you thinking of going and where’s a good place to get those? I’m considering the 6.5 predator and 30 series just cause of the cost factor. Do you plan on shortening whatever suspension you end up using or leaving it stock?
A bit of advice, don't take out the suspension. Mine's a tad soft, crashes pretty hard on short drifts. I have heavier springs, just haven't installed them yet. Don't go less than the 9.5 hp, better to have enough grunt than push the darn thing. Lots of good info on building, couple of nice ones using a sled tunnel. The two I built were done with sq tube.
I saw the build thread of the guy who made that sled I think his user name is team rapo he’s on here but the thread I saw was on another forum. I see the simplicity of the design and didn’t think about the crank case being the counter weight plus maybe a battery or a gas can to balance it out as well. I’ll definitely look into it. He said he tried 3 different engines to balance it the best and he settled on a 7hp engine and a 72 tooth gear and a 30 series. What would happen if you used a centrifugal clutch like this straight to a 72 tooth gear instead of the torque converter? https://m.northerntool.com/shop/tools/product_200310374_200310374