OK, 1980 Batavus Starflite II 30mph version. I just got this one running very well (timing mostly - some carb leakage I fixed too). Spec recommends an L82C (champion) or actually a Bosch W240T1 (which is the new W4AC). Newer fuels require a hotter plug (or so I've heard), so the L86C is the overwhelming choice, or the Bosch W8AC.
I had a new L86C which I have been using all through the repair and testing phase. Now that I put it on the road I went to get a new plug from Advance Auto Parts here in south florida. (We just had Hurricane Wilma come through so there is an awful lot of trouble with parts availability and such), so the only one they had was an Autolite, that was supposedly the same as the L86C.
That Autolite doesn't run for crap! Its gapped right at 0.030 like it should be, but It wouldn't start at first, it actually flooded it, and after it cleared out, I was only able to get it going VERY crappily at almost full throttle. As soon as I was starting to back it down, it died and wouldn't start again. It flooded, soaked the plug. I took that Autolite out and put the Bosch W8AC in, and it started right up! Idled and everything. Just to test, I put the autolite back in, and it had the same problem. It wouldn't run for anything! Put back the W8AC, good as gold....
So....... I'm staying away from Autolite plugs for this ped.