Originally Posted by willis 2000
2-stroke plugs typically won't burn their carbon deposits off. The NGK 8 heat range should be about right. OK, we all have our gas/oil favorites, but for air-cooled bikes, I had the best results with regular grade gas mixed 32:1 with Golden Spectro. If I was never going to ride hard, an NGK 7 heat range would be ok.
I disagree,with a heavy load of modern oil,premium pump gas and correct jetting this is what some old plugs (5K miles or so) from my '84 RZ 350 look like. A healthy spark is required though.