Im pretty sure it was the early 90s from Polaris.
there is nothin you can do to an efi snowmobile. the snowmobile is ran by a computer box therefor you can not fight against the box!
What fluids to add to a 1993 Polaris Indy 500 EFI Snowmobile
This snowmobile is reported to be about 98 hp.
140-150 depends on aftermarket parts, miles, use, so on.
Dirty Carberator. The needle vavle isn't letting enough gas in when you push the throttle and it is starving for gas and then kills.
That would depend if you are asking about the 550 ATV or the 550 snowmobile. Stock HP (have no idea what you have done to "turn it up") 550 Pantera Snowmobile 80 hp 550 H1 EFI 4x4 ATV 39 hp
The 2009 Arctic Cat 550 EFI has a top speed of around 75-80 miles per hour (mph) under optimal conditions. This speed can vary based on factors such as rider weight, terrain, and maintenance of the snowmobile. The 550 EFI is known for its balance of performance and efficiency, making it suitable for various riding styles.
1987
Actually, snowmobiles run on fuel so it's fuel power. Although they are working on it, they haven't made the snowmobile that runs on horses yet.
EFI, you cannot beat EFI over VVTI
Electronic Fuel Injection (EFI)
To remove the seat from a 1995 Arctic Cat Pantera 580 EFI, first locate the seat latch or screws securing it to the chassis. Typically, you’ll need to lift the seat slightly while releasing the latch or unscrewing the fasteners. Once released, carefully pull the seat away from the body of the snowmobile, ensuring not to damage any attached components like wiring or clips. Always refer to the owner's manual for specific instructions and torque specifications if applicable.