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#11638851 - 05/31/16 08:32 PM Extended idling (scanning) and Yamaha 250 SHO
KC_Fisher Offline

Registered: 05/20/13
Posts: 205
I have a new to me 250 SHO and have read that idling for extended periods can be a problem on 4 strokes, especially SHO motors contributing to early powerhead issues. I'm going to be scanning for a couple of days and was wondering if there's any recommended protocol for extended idling with a SHO, such as 30 minutes idling followed by 10 minutes WOT to prevent carbon build up. Or will running Ring Free and a 1 mile WOT run in between 20-30 minutes of idling be sufficient?
Don't want to blow my new motor! Thanks!

#11639447 - 06/01/16 07:38 AM Re: Extended idling (scanning) and Yamaha 250 SHO [Re: KC_Fisher]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10465
Loc: Littlefield Tx & Lake A. H. US...
Get extended warranty. The 2 most important things I hear: 89 octane and ring-free.
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

#11639474 - 06/01/16 07:47 AM Re: Extended idling (scanning) and Yamaha 250 SHO [Re: KC_Fisher]
Don G Offline

Registered: 06/14/11
Posts: 313
Loc: Comanche County, Texas
First 10 hours of break-in (no idling). Idling time after break in is not addressed in the manual although I limit mine to 30 minutes or less the vary speed from 3K to WOT for 5 to 10 minutes. Only thing Yamaha Tech advised me to use was STABIL ethanol treatment. I am curious to see what others have to say about the ring free. SHO also needs to be serviced every 50 hours.
Don G

#11640106 - 06/01/16 12:10 PM Re: Extended idling (scanning) and Yamaha 250 SHO [Re: KC_Fisher]
Capt Craig Offline
Extreme Angler

Registered: 08/25/09
Posts: 1045
Loc: Richland-Chambers
I use my for extended periods of idling when fishing and stopping to check an area. I have not hat a single issue in 3 years. I have been running Yamaha 4 stokes for many years and never had a single engine issue and I fished them all the same way.
Capt. Craig Copeland

2013 Nautic Star 2110 Shallow Bay Boat

Nautic Star Boats Pro Staff (
Redneck Fish'n Jigs Pro Staff (

#11640178 - 06/01/16 12:35 PM Re: Extended idling (scanning) and Yamaha 250 SHO [Re: KC_Fisher]
KC_Fisher Offline

Registered: 05/20/13
Posts: 205


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