03 4stroke 115 yamaha - cuts out occasionaly

tkess987 · #1 January 11th, 2009, 07:04 PM

Short and sweet. Occasionaly if I am cruising slowly at 2,000 or so rpms and quickly put throttle in neutral. Engine will cut out? Happens more when backing off trailer and putting back into neutral. If I do it smoothly - does not seem to happen..( which I do try to be smooth with the throttle) I haven't changed spark plugs in a while. Could that be the problem.. Not a real big problem now, but I would like to head off any future real problems..
Thanks

gcboat · #2 January 11th, 2009, 09:59 PM

Why don't you just go ahead and do a tune up on the motor, at least get that out of the way. Also check you RPM's at idle - might be low ( in gear ).
There could be a lot of reasons for this to happen but start with getting the motor fresh. Never know.

bossee · #3 January 16th, 2009, 05:54 PM

Hi,

I have a Yamaha F115 also, 2003.
Only time my F115 has stopped was after a service Yamaha dealer made and they did not screw on the built in fuel filter correctly on the threads so it did not seal properly. I found out by taking the cowl off and then I could see some gas dripping at the fuel filter. I unscrewed and and screwed it on properly on the threads so the rubber seal could seal as it was intended.
Other that that my F115 had never stopped and I have used it since I bought it new 2003. Great outboard by the way. Here is a picture of my F115 where I'm cruising in about 30 knots a hot summer day:

/Bo

Yamajoe · #4 January 16th, 2009, 06:53 PM

great shot bossee, i agree with previous advise, get the tuneup done.

sdsaw · #5 January 17th, 2009, 03:27 AM

Does your motor struggle to idle smoothly when you drop down to idle speed but eventually smooths out?
First, do as the others have already said; Get a tune up; Change spark plugs.
If the symptom still persists, try cleaning your IAC (idle air control valve) with some carb. cleaner, toothbrush and compressed air.
I have the 2001 Mercury version (Yamaha powerhead) and over seven years of ownership, have cleaned it 3 times which cures the idle issue.
I have always had trouble backing off the trailer and not stalling the motor... I'm thinking it's because it isn't warmed up enough.

Just an idea.
Hope it might help you.

Scott