I bought this 346 as a non-runner, put a new p&c in it, and new crank seals and carb (OEM). It’s just now about broke in—8 or ten tanks of fuel thru it.
Been working up around 8,000’ elevation, which I thought maybe accounted for the weird tuning issues. But yesterday it was running like dog crap and I shut it down. Pulled the spark plug today to look inside. I’ve never seen a plug like this. One side—about 40%—and the tip of the curved electrode is nicely tan, looking like a clean burn, but the rest of the thing is gunky black.
I burn pure gas, no ethanol, mixed at 50:1 (plus some, probably 47:1) with Stihl Ultra.
Any idea what causes this condition?
Also--it's a Champion plug RCJ7Y, so I replaced it today with a Bosch or whatever I had around. I don't trust Champion anymore. Seems like the new plug was better, but I only ran it a few minutes.
Been working up around 8,000’ elevation, which I thought maybe accounted for the weird tuning issues. But yesterday it was running like dog crap and I shut it down. Pulled the spark plug today to look inside. I’ve never seen a plug like this. One side—about 40%—and the tip of the curved electrode is nicely tan, looking like a clean burn, but the rest of the thing is gunky black.
I burn pure gas, no ethanol, mixed at 50:1 (plus some, probably 47:1) with Stihl Ultra.
Any idea what causes this condition?
Also--it's a Champion plug RCJ7Y, so I replaced it today with a Bosch or whatever I had around. I don't trust Champion anymore. Seems like the new plug was better, but I only ran it a few minutes.