- Joined
- May 11, 2007
- Messages
- 97
Now my newest problem to pop up is that my left cylinder only occasionally fires. It'll still start with two or three kicks with the choke on and stay running, but the left side will only fire here and there. When revved up it'll fire more but still not consistently. It fires pretty consistently under acceleration though. Left plug is soaked with gas if I pull it after just idling, and I can definitely hear/smell/feel the difference coming out of the pipes - right side everything's normal but I only get this "chuff chuff chuff" out of the left and it stinks like gas, basically just acting like a big air/gas pump.
I switched plugs, leads, coils, problem doesn't switch sides. Just put in new AP64s to replace the NGKs, thinking it was just weak spark. I get a better spark now but it didn't change the firing problem. Just timed it a couple weeks ago, and haven't put 50 miles on since then, mainly because I can't get it running well enough to leave the neighborhood.
Retorqued head and reset valve clearances. All the valves seemed to move ok, and no broken springs or anything. Compression was about 150 on each cylinder.
I have a single MkII carb so that rules out one of two carbs just flooding a cylinder. Dismantled that in the process as well and didn't notice anything abnormal - jets looked fine and no air leaks around the manifold that I could tell. Needle's moving fine too, with no binding or hanging on the edge of the jet.
I'm at a loss. My gut feeling is an electrical problem but aside from timing and checking grounds to the ignition, I'm not sure what else would cause this on just one side. I'm praying it's not something with the head since it hasn't even been 75 miles since I had it rebuilt, but if it's not electrical what else would it be?
I switched plugs, leads, coils, problem doesn't switch sides. Just put in new AP64s to replace the NGKs, thinking it was just weak spark. I get a better spark now but it didn't change the firing problem. Just timed it a couple weeks ago, and haven't put 50 miles on since then, mainly because I can't get it running well enough to leave the neighborhood.
Retorqued head and reset valve clearances. All the valves seemed to move ok, and no broken springs or anything. Compression was about 150 on each cylinder.
I have a single MkII carb so that rules out one of two carbs just flooding a cylinder. Dismantled that in the process as well and didn't notice anything abnormal - jets looked fine and no air leaks around the manifold that I could tell. Needle's moving fine too, with no binding or hanging on the edge of the jet.
I'm at a loss. My gut feeling is an electrical problem but aside from timing and checking grounds to the ignition, I'm not sure what else would cause this on just one side. I'm praying it's not something with the head since it hasn't even been 75 miles since I had it rebuilt, but if it's not electrical what else would it be?