I'd check the spark plugs...

On Tue, May 2, 2023 at 2:09 PM Spencer Allen <soxndubs1951@gmail.com> wrote:

> 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
>