I have a 1951 Evinrude Fleetwin 7.5 hp 4443 that I found in storage. I've done quite a bit of work recently and got it running for the first time in 40 years. Compression is 90 psi upper and 88 psi lower. I have replaced the ignition coils, condensers, points (0.020", timing adjusted with timing fixture), spark plugs and wires, carb rebuild for Tillotson MD-34B, new impeller using belt sander method, replaced broken tiller handle. I'm using lubriplate 105 for gearcase lube and seals seem to be keeping water out. Few issues now and I've exhausted the internet so here to get some help!
1) Motor starts and idles well however seems to be lacking power - 7 mph on narrow 14 ft jon boat light load. Adjusted low/high speed needles, that was max. Thoughts? Using 16:1 gas. Decarb? See photo below and number 3.
2) There was no water circulating after new impeller, but there was crud in the cooling system and flushed most of that with water hose through the flush hole in the water pump housing. It circulates, but it's hot water and kind of intermittent stream and better at full throttle. Motor runs warmer than I'm used to, but is that typical for these older motors?
3) see photo. There is a Welch plug that was partially open next to the exhaust panel on the right (exhaust side of the motor) on the lower crank case. It didn't look normal and I have a replacement so I popped it out. It's a bare metal tube with small orifice to the left and the end of the tube looks like it should end blindly, but there's several irregular openings in the end. I'm assuming that's the inside of the crank case beyond that. I thought this was where my water was going, but no water circulates though there with the hose hooked up. There's some engine oil/fuel sludge that was coming from there while running but no water. I keep thinking this may be related to either of the above problems. Not sure where to go from here.
4) Also for the impeller - how tight show it fit as far as thickness? I didn't want to over sand it. The housing closes without effort, but there's not much room in there.
Any help is much appreciated! Thanks in advance.
1) Motor starts and idles well however seems to be lacking power - 7 mph on narrow 14 ft jon boat light load. Adjusted low/high speed needles, that was max. Thoughts? Using 16:1 gas. Decarb? See photo below and number 3.
2) There was no water circulating after new impeller, but there was crud in the cooling system and flushed most of that with water hose through the flush hole in the water pump housing. It circulates, but it's hot water and kind of intermittent stream and better at full throttle. Motor runs warmer than I'm used to, but is that typical for these older motors?
3) see photo. There is a Welch plug that was partially open next to the exhaust panel on the right (exhaust side of the motor) on the lower crank case. It didn't look normal and I have a replacement so I popped it out. It's a bare metal tube with small orifice to the left and the end of the tube looks like it should end blindly, but there's several irregular openings in the end. I'm assuming that's the inside of the crank case beyond that. I thought this was where my water was going, but no water circulates though there with the hose hooked up. There's some engine oil/fuel sludge that was coming from there while running but no water. I keep thinking this may be related to either of the above problems. Not sure where to go from here.
4) Also for the impeller - how tight show it fit as far as thickness? I didn't want to over sand it. The housing closes without effort, but there's not much room in there.
Any help is much appreciated! Thanks in advance.