.... here's more info for you to digest.
FAN COOLED 550 TUNDRA 2 STROKE
ADVANTAGES
Cheaper
Lighter by 20 lbs plus 2 gals water (the weight of 2 large chainsaws)
Will run and start up with stone dead battery because of pull start.
Will start in -30 or -40 cel
More power
Definitely a better hill climbing skidoo
Far less moving parts in the motor
Only have to add oil - never change it in the engine
DISADVANTAGES
Noisier
600 OH/ACE 4 STROKE TUNDRA
ADVANTAGES
Quieter
DISADVANTAGES
Is there a pull start??????
Far more complicated
Special tools to change oil
Also needs fairly expensive oil filter
May not start in below -30 (a real consideration if you're out overnight & it drops below -30 & won't start)
20 dry weight difference plus another 20 lbs of water
Can't leave idling...in milder weather they'll overheat if it sits and idles
Ask .... is it fan & radiator? or is it snow spray cooled somehow or both. On packed trails no loose snow.
We have a 2009 Skandic 800 SWT 4 stroke & are totally happy with it, but there are a lot of
days when we will not take it out because of the snow conditions & temperature.
All I can say is that no body makes a perfect machine for all conditions. This is why we have 3 different configurations. The same reason you would have a 1 ton pick up, a suburban and a small car.