Re: MIssing jet orifice 0315140 Evinrude 6r74C

[frankr]

Missing? Wonder where the heck it went. Anyhoo, 0315140 has a 0.044" orifice. It looks like the next size smaller (by my 1978 chart) is 0311854, which is 0.041" or 3 thousandths smaller. It is available at marineengine.com. You could get that and run a #57 drill through it which is 0.043"
diameter, or 1 thousandth too small. That starts to become trial and error.

Option #2 is change the float bowl to an older type with adjustable high speed needle and saw the needle off for clearance.

Option #3 is install the accessory adjustable needle kit, if you can find one. I haven’t gone the next step to find the part number for the kit.

EDIT: Oh yeah, you are in Canada. Changing the float bowl might be the easiest/cheapest way to go. There are thousands of them laying around in people’s dark and dusty corners.

EDIT, EDIT: Actually, I don’t know if the old style bowl with a packing nut will fit in the cowling. You will have to look at the situation and evaluate it.