My cousin has a 1970 340 hirth single puma and claims that it is so rare because its a protoype for promotion purposes. It has a couple of distinct features like brown on the dash, an aluminum bulkhead, and fiber glass console. does anybody know whats what about this sled?!!

Does anybody have any information for a 1976 Yamaha STX 340/440?

1974 yamaha GS 338 60 mph 3/10 handeling
1976 yamaha STX 340 75 mph 7/10 handeling
1986 yamaha bravo 250 47 mph 9/10 handeling

My TNT will bog when you pin it off the start and almost stall, Also when you get it to half throttle and then pin it it will only go for about 10 seconds then bog out and almost stall. HELP!!

It has an HD 73A

Does any body know the carb settings for a 1971 TNT 440?

F#@! if it was a doo everyone would've ran away

I was wondering if there is any way to tune up a sled without putting on any extra stuff. EX, run it richer or makeing adjustments to the carb. Particularly on a 76 STX 340 round slide kien carb or an 86 Bravo 250, or if you have information on any other snowmobile you have tuned up yourself.

Right now it has a round slidde Kien carb and along side the tunnel it says STX. All the decals are faded and worn so it probably is 1976

I seen a couple of websites that says my STX can do 90 MPH! Mine currently only can do 60MPH. Does anybody know of it will do 90 or whats wrong with it, if anything. Also does anybody have advice on hoe to tune it up without putting tunned pipes on it.