So I snapped my chain the other day and now I have a new one and I'm replacing it and part of replacing it is pulling my spark plug so I can turn the engine. I don't really check my spark plug is often as I should so this is really the first time I've seen it in a month or two. Is this running lean do you think. it seems to run perfect and if I go wide open it'll four stroke. I'm running a dellorto clone with a 65 jet at 3850 feet on a stock engine.