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  150 hp johnson idle speed?

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Author Topic:   150 hp johnson idle speed?
george nagy posted 05-13-2002 09:35 AM ET (US)   Profile for george nagy   Send Email to george nagy  
What does your 60 degree OMC 150 hp idle in neutral?
NEVER SCARED posted 05-13-2002 01:27 PM ET (US)     Profile for NEVER SCARED    
George, my 150 OceanPro has a fast idle after a cold start then drops down after its warm. I could not find a way to change idle settings (for blowing out engine tunner) but I think its all set in the factory and shouldnt be tampered with. Some smaller outboards can be adjusted.
george nagy posted 05-13-2002 01:36 PM ET (US)     Profile for george nagy  Send Email to george nagy     
What is the rpm at idle?
NEVER SCARED posted 05-13-2002 03:10 PM ET (US)     Profile for NEVER SCARED    
Never bothered to check, but it "sounds" high and would lower it if I could to reduce clunk when shifting. I'll check it this Saturday!
fester posted 05-13-2002 03:16 PM ET (US)     Profile for fester  Send Email to fester     
George,
I had a 1979 Evinrude 175 horsepower engine that idled around 900 rpm. The engine was a 60 degree V6. I believe this engine had an idle adjustment. I now have a 1999 Johnson 175 horsepower 90 degree V6 which idles at about 850 rpm after it is warmed up. It is my understanding that the only way to adjust the idle on this engine is to advance or retard the timing.
Jeff
Bigshot posted 05-13-2002 03:21 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Idle speed should be about 750-850 in GEAR. To adjust idle you adjust butterflies in front of carbs. If running a big SS prop you might have to run a high idle in neutral. My 15' with a 70 idled about 1100 and dropped to 750-800 in gear running a 20" SS.
hauptjm posted 05-14-2002 11:17 AM ET (US)     Profile for hauptjm    
george,

My '95 OMC Ocean does right at 800 in gear. In fact, quite surprisingly, this engine will run all day at idle and not so much as burp. I've taken her out in the Gulf of Mexico trolling downwind for over 4 hours and when I'm done, she cranks up and flies in. I'm still convinced this is the best 150 ever made; regardless of brand. I just wish I could find one hidden in some "grandma's garage" still in the box. I'd buy it in a heartbeat and store it for the day I have to put my baby to rest.

lhg posted 05-14-2002 02:19 PM ET (US)     Profile for lhg    
For what it's worth, George, the proper IN GEAR idle setting for Mercury 60 degree V-6's is 600 rpm. That is how my 200 EFI's were factory set, and they never skip a beat. Higher RPM's than that tend to damage the gears, and "clunk" when shifting.

Jim - maybe you should pick up a new Bombardier/Johnson carbed 150. They are insisting they are better engines, with all that stuff about junking OMC's old poor tolerance parts, "parts re-applying for the job", etc. They very well could be excellent engines.

clanton posted 05-15-2002 05:35 PM ET (US)     Profile for clanton    
For the 60 degree 150 OMC 600/700 idle rpms in gear, in water, boat moving.
where2 posted 05-16-2002 12:46 PM ET (US)     Profile for where2  Send Email to where2     
Although rare, I have seen where a defective tach produced what "read" to be a high neutral idle, while the "sounds like" idle was too low and caused the engine to stall frequently. I would suspect that a tach could fail in such a way as to "read" normal and have a "sounds like" idle that was faster than it should be. As stated above, the true test is what it reads in gear at idle.

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