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  1986 150 Yamaha rpm drop

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Author Topic:   1986 150 Yamaha rpm drop
Abalonehunter posted 06-30-2003 10:32 AM ET (US)   Profile for Abalonehunter   Send Email to Abalonehunter  
I've read rmart's posting on Engine "Bogging" Down but thats not really whats happening to my brothers 150. In the morning or from a fresh start he can run 10 or so miles out of Bodega and get full throttle and full rpm (5200 +/-) at this point he starts to hear and feel some sputtering and a lack of full rpm. This past Friday he made it out to troll for salmon, 12 miles no real problems till the end of the trip, then sputtering. The engine then trolled fine for 3 hours, 4 salmon later then headed back in and the engine would not get up to full rpm. He putted back in at around 3200 rpm, well not really putted but slow for him, came inside the jetty and all of a sudden the engine goes to full rpm. Does this sound like a fuel or a heat issue? He has recently replaced the fuel separator, the fuel tank was drained and pressure tested a month or so ago and the fuel is fresh. He has not de-gummed the carbs and is thinking thats the next step. May check some of the ideas from the bogging down post too.

thoughts?

thanks

George

FXSTB posted 06-30-2003 11:24 AM ET (US)     Profile for FXSTB  Send Email to FXSTB     
Maybe some "junk" is floating around in the carb(s) and getting into and out of the jets. It has happened to me.
tlynch posted 06-30-2003 12:08 PM ET (US)     Profile for tlynch  Send Email to tlynch     
I own a 1985 Johnson 150, all of my engine knowledge is based on this engine.

I just had a similiar issue and it turned out to be electrical. One of the power packs had gone bad and would go out from time to time and leave me around 2000-3000 RPM, and then all of a sudden would kick back in and the boat would take off. Because it is the easiest to check I would make sure that all six cylinders are getting spark when the engine is bogging down. Either use a timing light testing each wire one at a time, or do as I do and pull the spark plug wire off of the plug with your hand - you will know if you have spark. If you choose to go with my retarded method - keep your other hand clear of the engine block while removing the cap.

Hope this helps,
Todd

tlynch posted 06-30-2003 12:12 PM ET (US)     Profile for tlynch  Send Email to tlynch     
Sorry Jim,

I had a PROBLEM. Not an ISSUE.

Todd

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