Yesterday, I had a customer come with a badly leaking carb on his 70 Evinrude. It just needed a gasket.
I got it together, and told him that if he wanted to wait a few minutes, I would accompany him to the lake for a test run. If he was interested, he could see how to clean carbs. He agreed,so I pulled the carbs on the Johnson 50. As soon as I turned them over to drain them into my gas bottle, I saw the problem...
The carbs were completely full of oil. Pure oil. The VRO pump was bad.
They were out, so I cleaned the carbs, but found nothing, as expected. Then I disabled the VRO system. Hooked up the hose, turned the key, and VROOM... Off to the lake.
We dropped in, and both motors started instantly and idled smoothly. A good start! We parked and jumped in the boats and decided to make a big circuit of Jett island. I was very impressed with the thrust of this little 50! This little motor gets it done! I kept up with him without a problem. Surprise, since these boats are almost identical! I took a single picture, while flying across the lake:
That's when I noticed that he had fallen behind. I docked my boat, and for the rest of the trip, I was working on his boat. So my boat just sat. TORTURE!
It turned out, his rev limiter was getting stuck, since he was running too low a prop. Below 5200, he ran fine, but when he touched 5500, it would go crazy. Those engines have a 5700 WOT, so that wasn't right. We let it cool, and I ran back home and grabbed a steeper prop. Swapped them out, but it was not steep enough. Now the rev limiter was cutting in at 5000 RPM. Bad power pack.
Called it a day, and took his boat for a power pack. I had one around. Now, his boat ran great! He was very happy, but I was a little bummed, that I didn't get a real test run.
Yesterday, it rained in the morning. In the afternoon, I was working on an engine swap, and I realized that a part hadn't come in, and it was 6:45 PM. I had some daylight left.... YES!!!! Time to test a boat!
Right then, a friend pulled up with his boat. NOOOOOO!!!!!!! Are you kidding me?!?
He said he was having a hard time restarting, unless he went back and primed again. Sounds like air leaking in or a bad fuel pump.
I pulled his cowl, and he had a bowl-type fuel filter UPSIDE DOWN, mostly empty. Air was collecting in the inverted bowl. Could it be that simple?!? I had him loosen the hoses and flip it over.
Let's go test boats!
Now it was almost 7:30. Raced to the lake, dropped in both boats started and idled well. We pulled out and ran around the island once- no issues, yes!
I wanted to see what this little 50 HP would do, and he had GPS, so I challenged him to race to the bridge. I let him hit his gas first, and then I gunned it. My boat, being lighter, shot forward fast. I trimmed up, and got about a 5-boat lead. We ran even for a mile or so...
As we approached the bridge, I figured he would try to gun it and beat me out, so I trimmed up a little more to get every bit out of her, and sure enough he tried to catch me, but could not. I won by about 5 boat lengths! YAAAAYYY!!!!! (The crowd went wild!)
That was a blast! And my little 50 now had bragging rights! The most fun I've had in a long time
Now for the GPS data...
He said we were running 35.6 MPH for most of the run. But toward the end, when we both trimmed up, he was doing 38.4 MPH the last time he looked down, but maybe more, as he was watching me and not the GPS. Later, he said that he was running 40.1, so my little boat was doing somewhere between 38 and 40 MPH. Very respectable for a little 2-cylinder!
Now it was dark, and we called it a night. I turned on my new LED running lights and we ran back in...
I came home with a grin on my face, feeling more relaxed than I have for a long time. And this morning, I'm still smiling.
Life is good.
-TH