Megunticook
New member
2008 F4, I've owned it since 2013. Well-maintained, I do work myself including total carburetor disassembly, cleaning, inspection, etc. every winter.
I removed the metal cap/welch plug over the mixture adjustment screw so I can fine-tune the adjustment. Before launching boat the week of Memorial Day, I dialed in the idle speed and mixture using a tach. and she was running super.
Ran perfect first few times I used it.
Then one day I fired it up, pushed the choke knob in halfway as usual, and she wanted to stall. I pushed the choke all the way in and she recovered but still sounded stumbly. I removed the cowling and she came back to life. I tried leaning in the mixture needle some (I'm 1-1/4 turns out from lightly seated at this point, factory is 1-7/8), but something is way off.
Is she starving for air? Why would having the cowling on or off make that much difference? I've always set the idle speed/mixture with the cowling off, then replaced the cowling, and it never seemed to make much difference. I inspected the cowling and the vents at the top aren't clogged.
Any thoughts on why this is happening? Thanks.
I removed the metal cap/welch plug over the mixture adjustment screw so I can fine-tune the adjustment. Before launching boat the week of Memorial Day, I dialed in the idle speed and mixture using a tach. and she was running super.
Ran perfect first few times I used it.
Then one day I fired it up, pushed the choke knob in halfway as usual, and she wanted to stall. I pushed the choke all the way in and she recovered but still sounded stumbly. I removed the cowling and she came back to life. I tried leaning in the mixture needle some (I'm 1-1/4 turns out from lightly seated at this point, factory is 1-7/8), but something is way off.
Is she starving for air? Why would having the cowling on or off make that much difference? I've always set the idle speed/mixture with the cowling off, then replaced the cowling, and it never seemed to make much difference. I inspected the cowling and the vents at the top aren't clogged.
Any thoughts on why this is happening? Thanks.