I tuned up my 85 westy 1.9 about 2K ago and it ran fine until just before I
stored it last fall but now it's running a bit rough and I'll say rich from
the smell of exhaust. I pulled the cap and saw the cap and rotor had a
heavy layer of carbon build up. I have new ones coming from BD but need to
correct the problem before installing but can't figure out what is causing
the build up but suspect it's been heading to this since the tune. The
wires are not arching but I'm wondering if bad timing or O2 sensor would
cause this. Anyone have a list of probables?
Spencer