Hi,
this is not the first time I'm trying to resolve the current problem with my 1970 Johnson 60 HP 3 cyl, 2-cycle. Prior to yesterday the motor would die every time when needed to produce more power under the load in a lake (note: in a bucket w/o a prop this thing would revv up to the max - no prob.)
After yesterday's unsuccessful trial in the lake I decided to remove and inspect the carbs for the 1000-nds time! When I removed the air/silencer box to get access to the carbs I noticed something - the main fuel hose from the fuel filter/pump to the middle carb was pinched between the air box and the motor chassis! I thought and was pretty sure that I had found my problem! Couldn't sleep thought the night to test my motor in the lake again with the fix.
Well, the first 3-5 attempts of trying to push it beyond 2-5 mph failed. But I noticed that when I advance the throttle rather quickly than just in a gradual and slow fashion it seemed like it wanted to go for it. So at my second attempt of quickly pushing it forward it jumped up and off it went!
It would run like a brand new motor in all RPM ranges then. So then I put it into neutral and waited for 5 minutes. It worked fine in neutral. Then I tried to again slowly advance it to forward - and it seemed like again it was about to cut out and it did once or twice. Attempted to push it faster to 1/2 WOT position, first couple of times it died but then it went off just fine again!
Is it possible that the fuel that I am using is bad? This is the same fuel (87/regular, probably E10-15) from last fall, I put a can of SeaFoam into it thinking it would preserve the quality of the fuel.
Note: I don't think ignition timing should be causing this since it ran once perfectly and I didn't touch the timing screw at all.
Through the winter I restored the motor:
- new impeller;
- new spark plug wires and plugs,
- new carburetor "gutts",
- cleaned / adjusted the points,
- switched from a remote fuel tank to a pretty close-to-the-engine-located one,
- checked compression: #1=130, #2=130, #3=125
- the spark does "a 7/16" gap on all cylinders with a strong blue lightning like flame.... a real SNAP!" (Joe Reeves)
Sorry for the long one but I'm very pissed at this motor and will not stop until I figure out what is wrong with it!
Please help me????
this is not the first time I'm trying to resolve the current problem with my 1970 Johnson 60 HP 3 cyl, 2-cycle. Prior to yesterday the motor would die every time when needed to produce more power under the load in a lake (note: in a bucket w/o a prop this thing would revv up to the max - no prob.)
After yesterday's unsuccessful trial in the lake I decided to remove and inspect the carbs for the 1000-nds time! When I removed the air/silencer box to get access to the carbs I noticed something - the main fuel hose from the fuel filter/pump to the middle carb was pinched between the air box and the motor chassis! I thought and was pretty sure that I had found my problem! Couldn't sleep thought the night to test my motor in the lake again with the fix.
Well, the first 3-5 attempts of trying to push it beyond 2-5 mph failed. But I noticed that when I advance the throttle rather quickly than just in a gradual and slow fashion it seemed like it wanted to go for it. So at my second attempt of quickly pushing it forward it jumped up and off it went!
It would run like a brand new motor in all RPM ranges then. So then I put it into neutral and waited for 5 minutes. It worked fine in neutral. Then I tried to again slowly advance it to forward - and it seemed like again it was about to cut out and it did once or twice. Attempted to push it faster to 1/2 WOT position, first couple of times it died but then it went off just fine again!
Is it possible that the fuel that I am using is bad? This is the same fuel (87/regular, probably E10-15) from last fall, I put a can of SeaFoam into it thinking it would preserve the quality of the fuel.
Note: I don't think ignition timing should be causing this since it ran once perfectly and I didn't touch the timing screw at all.
Through the winter I restored the motor:
- new impeller;
- new spark plug wires and plugs,
- new carburetor "gutts",
- cleaned / adjusted the points,
- switched from a remote fuel tank to a pretty close-to-the-engine-located one,
- checked compression: #1=130, #2=130, #3=125
- the spark does "a 7/16" gap on all cylinders with a strong blue lightning like flame.... a real SNAP!" (Joe Reeves)
Sorry for the long one but I'm very pissed at this motor and will not stop until I figure out what is wrong with it!
Please help me????
