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40hp Mercury- 1998. This motor has the 60hp carburetors on it and the air intake baffles were off. Ran like a scalded cat. However, it was loud and idle was fast.
This week, I put the air intake baffle/plenum back on. Idle is great, but the motor will not rev up like before and almost 4-strokes. Running Rich. I have not pulled the plugs yet to confirm, but pretty sure the high speed jets need to be changed out.
From what I can find, the High Speed Jet is on the lower Port side of the carb, near the bottom of the bowl. When I pull the brass "screw" it is a hollow bolt with two holes in it. Is the size of these holes the Jet??
There is no number on this to indicate what size the jet is.
The plugs are wet and dark, almost black, but no carbon build up. Only ran it 2hr with with setup. Took the Air Plenum off, and the motor runs super- VERY fast.
This week, I put the air intake baffle/plenum back on. Idle is great, but the motor will not rev up like before and almost 4-strokes. Running Rich. I have not pulled the plugs yet to confirm, but pretty sure the high speed jets need to be changed out.
From what I can find, the High Speed Jet is on the lower Port side of the carb, near the bottom of the bowl. When I pull the brass "screw" it is a hollow bolt with two holes in it. Is the size of these holes the Jet??
There is no number on this to indicate what size the jet is.
The plugs are wet and dark, almost black, but no carbon build up. Only ran it 2hr with with setup. Took the Air Plenum off, and the motor runs super- VERY fast.
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