2002 Bombadier Quest 650. Bought used. Probably some blow-by.
It's touchy. Set throttle in warm weather & it stalls often in cold. Set throttle in cold weather & it runs too fast to shift when running. Use is mainly plowing snow. (Pretty rough duty since the snow is higher than the blade.) Occasionally dragging firewood out. Note: it's only a single cylinder... plug has to be "good".
Problem is... had a new standard spark plug NGK DCPR8e start of the winter. The one that came out was sooted black. Just had to put in a spare today. Turned over but wouldn't start. Started right up with new plug. The plug that came out was "clean". Only have one spare now so I'm shopping for additional spares.
Are any of the additional cost plugs any good?
Mods: Wasn't sure where to put this. Move it?