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Author Topic:   Merc 2003 90 2-stroke cuts out in neutral
Beaner posted 05-08-2005 06:14 PM ET (US)   Profile for Beaner   Send Email to Beaner  

Last year during my motor's 2nd year of use, the motor started cuting out while idling in neutral. The motor is 2003 90 hp 2 stoke on a 170 Montauk. Last year I can point to two things that changed on the motor. (1) New pate tank and (2) 10% ethanol in my fuel. I just chalked it up to the alcohol. Again this year, the motor stalls after idling for a few minutes in neutral. I have done all required maintaince (e.g. winterize, new plugs, new filters). I also added a fuel/water seperator this year and I still get the cutouts. Besides this, the motor works fine (starts fine too). My question is could this be something other than the alcohol and if so, what should I be looking for? Thanks.
bsmotril posted 05-08-2005 07:24 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
You may have to bump the idle speed up slightly to compensate for the Ethanol in the fuel. Also could be something as simple as that it is time to replace, or clean, the spark plugs. BillS
Clark Roberts posted 05-13-2005 07:23 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Check the "idle air" needle valve adjustments on each of the three carbs. Shop manual will give you the drill...that and a "link and sync" should do the trick! good luck... Clark.. SCN
Beaner posted 05-13-2005 07:07 PM ET (US)     Profile for Beaner  Send Email to Beaner     

Took her out today, motor died after traveling about 200 yards. Would give it gas and it would just pause and cut out. Unhooked fuel/water seperator (quickly) and ran fuel line straight to motor. Ran slightly better, just had to keep it just in gear or it would cut out. Seems like a fuel restriction (which is why I ran fuel direct). Anyway, the re-route at least got me to the dock although it died while putting in reverse. Fortunately its a high dock so the impact was to the rubrail which is practically indestructable. Brought her to the local Merc guy this afternoon, waiting to hear from him. Will have him fix the pressure gauge (which never worked since I had the boat) and the trim sender unit (lasted less than a year) since it will be sitting at the shop. Perhaps Brunswick can buy Honda or Suzuki so I have some other options when I finally bite the bullet on a Nantucket.
Beaner posted 05-18-2005 08:37 AM ET (US)     Profile for Beaner  Send Email to Beaner     

Update: According to my local Mercury service center, my carbs are shot and need to be rebuilt. I guess I should have installed that water/fuel seperator last year instead of this year. In addition, I think during this winter I will try to run the boat monthly to avoid the five month layup.
wyeisland posted 05-18-2005 09:33 AM ET (US)     Profile for wyeisland  Send Email to wyeisland     
Welcome to the world of Mercury. Its a disaster that Whaler is now linked to Mercury.
mikeyairtime posted 05-18-2005 11:04 AM ET (US)     Profile for mikeyairtime    
Put a shutoff valve on your water separator and run it out of fuel after you use it.
fishinchips posted 05-18-2005 08:30 PM ET (US)     Profile for fishinchips  Send Email to fishinchips     
Use mercury quickleen.
this will help you.


Clark Roberts posted 05-20-2005 08:04 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Beaner has water in gas and the "hate Mercury" trolls come out of the woodwork. So water in the gas is the fault of the engine!? What a leap! This type of reasoning (or lack of reasoning) drives me nuts! Beam me up... Clark...Spruce Creek Navy
PS>Beaner, there is a carb bowl drain plug on each of the carbs and they are accessable, though bottom one is not easy, and water can be drained from carbs in an emergency if you have the right tools. Check it out! The water separating filter is a good idea and I use them on all of my boats.. Happy Whalin',,, SCN
Peter posted 05-20-2005 08:41 AM ET (US)     Profile for Peter  Send Email to Peter     
Besides solving the water-in-fuel problem, you ought to do a "decarb" in addition to your other maintenance.
Liteamorn posted 05-20-2005 02:08 PM ET (US)     Profile for Liteamorn  Send Email to Liteamorn     
The only way you can get water in an above deck tank is from your gas supplier. I would inquire about it if your problem really is water. Did your mechanic mention water? Maybe the mechanic is alluding to dirt in the carbs.
Beaner posted 05-20-2005 04:09 PM ET (US)     Profile for Beaner  Send Email to Beaner     

The mechanic said there was water and other junk in the carbs. They tried to take me over the coals on the rebuild, so I told them to give me brand new carbs for only a few dollars more. I'll take the old carbs and try to rebuild them for future use. I just hope the motor runs right when I get it back.

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