Denis Gionet
Well-Known Member
I saw pics on a forum somewhere, of someone's 435 Husky spark plug and noted it was a bit darker than mine, and had some oil on the threads, like how a typical 2-stroke plug usually looks. Did a bit of milling with my 435 on Sunday, and while cleaning up the saw & checking the air filter, I thought I'd take a peek at mine. I felt it seemed a bit, um, dry-ish, and borderline lean, although the 4-stroke burble tells me different. It's adjusted probably nearly perfect, burbles a wee bit out of the cut, and cleans up in the wood. Fuel/oil is by the book, Husky XP & 50:1 premium e-free gas.

I'm thinking 2 things.
1 -- fuel/air mixture is probably ok for cutting firewood, but could stand to be a tad more rich when on the mill, helping to cool it off a bit.
2 -- the extra heat from long full-throttle runs is causing 100% of the oil to burn, leaving none to spare on the plug threads.
Thoughts ?

I'm thinking 2 things.
1 -- fuel/air mixture is probably ok for cutting firewood, but could stand to be a tad more rich when on the mill, helping to cool it off a bit.
2 -- the extra heat from long full-throttle runs is causing 100% of the oil to burn, leaving none to spare on the plug threads.
Thoughts ?