-40 F in Barrow! The crankcase blow by directed into the airbox was freezing up the carbs!. So that's been vented 'elsewhere'. But the engine is running too lean. They've found some jets from a Yamaha snowmobile application.
And yes he is going to pull the sled with a rope. 100 ft of rope.
Day after tomorrow is planned departure if the air/fuel ratio is resolved.
The view from the SledCam.