I've had some long term idle issues with this engine and undertook today to clean and "rebuild" the carbs. The engine has run great at high speed. These are very simple carbs and actually about the only thing in the kits that could be changed was the needle valve and seat, and the gaskets. The carbs looked actually quite clean (I've seen much worse carbs run pretty well). I did not remove the welch plug as those circuits seemed to be clean and passed carb cleaner and air quite well.
I replaced the two fuel lines from the pump to the carbs with 5/16" fuel and emission hose and a coulple of questionable hose clamps (wire ties).
Ok here's the questions.
1. Prior to this work the slow speed air adjustment was best at around 2 turns out from the needle seat. Now it's around 1 turn out top carb and not very responsive to adjustment there at all. The bottom carb is best at around 3/4 turn out. Given that I only changed the float needle and seat and the gaskets, I'm puzzled at the change in the adjustment for idle AND ESPECIALLY AT THE NON-RESPONSIVENESS of the top carb. Any ideas?
2. Also, is it possible to get free from the VRO fuel pump and go to premix using the old style diaphram fuel pump? I've had OMC 50 hp engines in the past and they were terrific for idle...but not this one!
3. There's a hose nipple on the bottom rear of the air silencer which I assume is for a hose to drain off fuel/oil spillage from the carb throats when tilted. Where's the hose go? I assumed it to go to the nipple on the bottom front of the intake manifold. Is that correct?
Steve
I replaced the two fuel lines from the pump to the carbs with 5/16" fuel and emission hose and a coulple of questionable hose clamps (wire ties).
Ok here's the questions.
1. Prior to this work the slow speed air adjustment was best at around 2 turns out from the needle seat. Now it's around 1 turn out top carb and not very responsive to adjustment there at all. The bottom carb is best at around 3/4 turn out. Given that I only changed the float needle and seat and the gaskets, I'm puzzled at the change in the adjustment for idle AND ESPECIALLY AT THE NON-RESPONSIVENESS of the top carb. Any ideas?
2. Also, is it possible to get free from the VRO fuel pump and go to premix using the old style diaphram fuel pump? I've had OMC 50 hp engines in the past and they were terrific for idle...but not this one!
3. There's a hose nipple on the bottom rear of the air silencer which I assume is for a hose to drain off fuel/oil spillage from the carb throats when tilted. Where's the hose go? I assumed it to go to the nipple on the bottom front of the intake manifold. Is that correct?
Steve