you mention corrosion problems with redline oil. I have run thru 12 gallons of redline Allsport in the last five years, in chainsaws, weedeaters, blowers, motorcycles, and an ultralight and have never had a corrosion problem . Is your sled stored outdoors.I did an unscientific test of taking two wristpins and coated one with redline and one with Pennzoil aircooled twostroke oil and left them outside all winter neither one rusted.