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Johnson 150 running issues
Today i went to run my 1985 Johnson 150 on a 6 gallon tank with fresh gas and it wouldn't run below 1000rpm. If i turn the choke knob it will run rough below 1000 rpm. When i hold the carbs open a little it will crank and run beautiful. I try to run this motor once a month on fresh gas with stabil in a small tank but its been three months since i have run it. Tomorrow i plan to check plugs. What else should i check? I am beginning to think its a carb issue. I do not know when they were cleaned last. Right now i have adjusted the throttle cable out so it runs good. But i hate to cover up a problem by doing so. Anybody got any suggestions?
Also i have a 25" shaft Yamaha 150 2 stroke i may put on but need a remote control.
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1983 V-20 capsized. . . . in the garage. 
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#2
01-07-2012, 09:12 PM
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Pull the carbs and clean out the jets inside of it.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#3
01-07-2012, 09:22 PM
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Would i need a chilton book for that? I haven't pulled the silencer cover off yet so i don't know what i am getting into. I cleaned/rebuilt all the carbs on the twin 150 Yamahas on the big boat. Is it pretty much straight forward like the yammies, where i can see the jets when i remove the silencer? Also would i need a rebuild kit with all the gaskets and such?
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1983 V-20 capsized. . . . in the garage.
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#4
01-07-2012, 09:24 PM
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The jets that need to be cleaned will be inside the float bowls. If your careful you can normally re-use teh gaskets, but it is always a good idea to change them.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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#5
01-07-2012, 10:15 PM
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I just looked up a parts diagram for the carbs. The jets i am cleaning are #5 correct?
__________________
1983 V-20 capsized. . . . in the garage.
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#6
01-07-2012, 11:53 PM
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One thing I've found through the years is to always run any gas going into my engines through a fuel filter....even from a portable gas tank. I made up a portable fuel line that goes into a filter, and then the filter has the regular engine fittiing on the outflow side. I figure that a little protection is well worth the slight extra cost of the filter.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless. Last edited by Destroyer; 01-08-2012 at 12:08 AM.
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#7
01-08-2012, 12:43 AM
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Quote:
__________________
2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664
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