Eric.C
Contributing Member
Every time you run the engine up, it starts backfiring because of a lean condition. Lean Condition= excessive heat.
Update from last weekend:
Verified fuel at 6psi all the way up to the point of backfiring, so pressure to carb is good. Swapped carbs and the problem stayed with the engine. Not a lean condition.
Actually, no. Lean conditions at start up do not yet involve excessive heat.
Have you tried opening up the idle mixture screws a turn? If that won't do, it's possible that the idle passages are too small. (Don't laugh: I had to drill them out on one of my carbs.)
Jeff
Engine purrs all the way up to 2500. We can enjoy a day of fishing with no problems as long as we keep it under 20kts (~2500RPM both). Nothing to do with idle mixture, but thank you both for the replies.