engine, good or bad??

[springer]

i was originally going to buy the HF clone motor, but i stumbled across this. i like the idea of it being 2 stroke since my four wheeler is 2 stroke, but i do not know much about it. it is a yamaha 337cc 2 stroke originally off of a snowmobile. would this be better for a simple kart? its the same price and it runs fine. this relates to my other thread about my kart frame here: http://www.diygokarts.com/vb/showthread.php?t=6342

 

[freakboy]

go for it man!!! it will be fast as all hell!!

 

[Kaptain Krunch]

Very interesting, looks like someone converted it to run a normal belt, rather than the stock torque converter. If you do get it, make sure it can be adapter back to run a torque converter, because that will be much much better than a belt tension setup.

 

[Russ2251]

Looks to be a paraglider engine.

 

[springer]

cool, going to pick it up tomorrow after i go hunting. any idea what kinda rpm's will come from this thing so i can get an idea of what sprockets to use. i was thinking about 10/60 with 20" tires, but i could be way off. any recommendations on what to use?? jack shaft, yes or no?? i am having a hard time deciding since 2 strokes have little power in the lower rpm's, i dont know how low to gear to have enough power to be able to take off from a dead stop. any help would be appreciated.
thanks,

 

[Kaptain Krunch]

it could probably do 6-7k maybe more, but again you need the primary and secondary clutch, otherwise the motor wont be that great.

 

[springer]

it could probably do 6-7k maybe more, but again you need the primary and secondary clutch, otherwise the motor wont be that great.

sorry if i sound ignorant, but i am really new to all this. by primary and secondary, are you saying one on the engine shaft and the jack shaft? is that to allow the rpm's to climb before trying to move the axle?
thanks,

 

[Kaptain Krunch]

Yup, all snowmobiles have them, there two pulleys that act as an automatic transmission/clutch, they constantly change size as the engine rpms change, therefor changing the gear ratio. It starts you off in a very low ratio, so that you can have very good acceleration, but will step it up to 1:1 or sometimes even higher ratios, so you still have a good top speed.

Ask the guy if he still has them, the primary clutch (one on the engine) is probably the most important, because its fairly specific to the engine, the secondary however just has to match the belt size that the primary uses, and you can most likely rob on off a different sled.

 

[Kenny_McCormic]

Neat crank adapter it has on it.

 

[springer]

ok, i was thinking of just regular centrifugal clutches. any idea where i could find what you are talking about, the ones that constantly change size? if not to buy, something i could look at to get a better understanding of them. i know the guy i am buying it from does not have them because he was using the engine on an air boat.
thanks for the help,

 

[Kaptain Krunch]

They come on all snowmobiles, if you find what sled the engine came from im sure you could find another one on ebay. It could have come from a yamaha enticer 340, but im not sure.

A centrifugal clutch would be a complete waste of that engine, not only that but good luck finding one to fit/handle the power, that thing was probably rated at 20-30hp (depending on where it was from).

 

[modelengineer]

Even in a worst case scenario where you use the belt drive it's supplied with, it will still be a much better engine than a clone.

 

[springer]

well, i figured out exactly what you are talking about. on ebay, i found a primary and secondary for a yamaha ovation (not sure if its the right model), but i dont have the money even if it was a perfect fit. might just have to do the belt drive setup to get by for now.

 

[Kenny_McCormic]

Odds are its a standard 30mm major diameter 10:1 taper shaft under that straight shaft, any old sled trans will work.