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Old 06-23-2006, 07:04 PM
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Default Johnson SLOW mode bypass?

1995 Johnson 150- new powerhead, powerpack, stator, plugs, VRO pump and carbs rebuilt. Just put the engine back together and it would stay running if you idle it down below 1000. When attempted to run under load it just dies. First time quit altogether above 1200 or so, second time would run about 2000rpm at WOT.

I was wondering if the slow mode was some how creating an issue. There is no alarm, and the engine didn't even run long enough to overheat. The overheat alarm was tested by holding the sensor to the spark plug and the alarm worked.

Hence, it there anyway to bypass the slow mode altogether to just see if that circuitry is causing the problem? Thanks
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Old 06-23-2006, 07:07 PM
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Default RE: Johnson SLOW mode bypass?

That is supposed to read "would NOT stay running below 1000rpm"
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Old 06-23-2006, 07:14 PM
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Default Re: Johnson SLOW mode bypass?

Does the eninge shake bad?? Slow will shake the engine pretty bad. Im guessing your not in slow. If it will not stay running below 1000rpm slow has nothing to do with that.
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Old 06-23-2006, 10:11 PM
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Default Re: Johnson SLOW mode bypass?

My first guess since you say that you rebuilt the engine is that the carburator low jets are not set correctly causing the engine to flood at the low RPM's. As far as the engine quiting when putting it under load, I would have to suggest checking to make sure that the drive shaft is correctly connected and that the prop can spin freely in neutral. You might also try spinning the prop while the engine is in forward gear and check that the fly wheel is turning.

I give you this advice from my knowledge and experience with my twin evinrude 175's from 1995.
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Old 06-23-2006, 11:05 PM
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Default RE: Johnson SLOW mode bypass?

If you want to disconnect the SLOW sensors, disconnect the tan/blue leads off the port and starboard temperature switches. As far as SLOW goes, it only kicks in if the temperature exceeds 240 degrees.

One thing you have to consider is that the carbs on that engine have three circuits, low, intermediate and high speed. One question I would pose is, Did you perform a link and sync on the carbs? The low speed jet is adjustable and the others are preset orifices. You have to make sure that the orifices are clear. If you adjust the carbs, make sure that you have it in the water with proper back pressure. A low idle speed can also cause it to stall on acceleration. The initial setting for those carbs is 3 turns out. Then you'll have to fine tune them. Hope this helps. Good luck.
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Old 06-24-2006, 01:57 AM
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Default Re: Johnson SLOW mode bypass?

We had a problem like that with a carbed Evinrude 115 of the same vintage. I wasn't the one who fixed it, but some fuel line or something deep under a bunch of parts was twisted and kinked. The motor was for one of our fast rescue boats and we were so stumped by it we almost bought a new motor while in Japan. We couldn't get a carbed 2-stroke and didn't want to go through the rewiring involved with fuel injection.
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