I don't know, I just put 900 Iron Dog miles on my 2013 Polaro TX 800 SnoTraveler with 740 miles on sub-recommended octane fuel, with lots of fill ups pumped from barrels - hopefully not from the bottom. I ran the engine on the 91 octane setting for the slower portion of the run, switching to the lower octane setting for the river runs, where oil was added to the fuel. Air temperatures averaged -20 degrees with stiff at times headwinds on the rivers. Iso was also regularly added. The "det" ceiling was hit once on both legs. In each time, the engine was shut down and restarted and the riding style that caused the issue was avoided. My teammate on a similar sled experienced similar issues.
For those that haven't experienced it, the 800 engine is the absolute bomb for trail based sled. Run along at 5600 to 6250 rpm throttle it up to 6850 rpm and increase speed by 50%. We had our "det" issues when we pegged the throttle rapidly in hard pulling snow. Slower throttle pulls, say to 7800 rpm, resulted in most pleasurable moments, anytime you want. The lower rpm pull this engine has is simply breathtaking. Cruising at these engine speeds provided enough speed for this trip and resulted also in fantastic fuel mileage. We made the 120 mile run up the Yukon from Ruby to Tanana using 7.5 gallons each. Like said mostly on minimum grade octane fuel. Note: The TX 800 SnoTraveler is a rebadged by me Switchback Assault - a name I don't quite get. 550iq
it was *lmost 3 a.m. when I wheeled in with my truck and trailer and decided to fill it up... I don't even run 87 in my 03 700 sks.... please I encourage you to yell at me more and I'm not being sarcastic..... i damn near tore down the engine to do a rebuild lol
