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Adjusting rpm on ox66 150


Northfl

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Hiy guys, 

my outboard sneezes or coughs when at idle. If i bump it i to gear the rpm’s are 4-600. Is there any way i can adjust this to bring them up to stop the sneezing. Sometimes it also shuts off when it does it but starts right back up. What should the rpms be at idle in gear? I read somewhere a while back that they should be around 8-900. If i remember correctly.  Other that that issue motor runs great

 

 

Thanks for any help

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1 hour ago, Northfl said:

Hiy guys, 

my outboard sneezes or coughs when at idle. If i bump it i to gear the rpm’s are 4-600. Is there any way i can adjust this to bring them up to stop the sneezing. Sometimes it also shuts off when it does it but starts right back up. What should the rpms be at idle in gear? I read somewhere a while back that they should be around 8-900. If i remember correctly.  Other that that issue motor runs great

 

 

Thanks for any help

You should be idling around 1000 - 1050 RPM on the hose and around 700 - 800 in neutral submerged. 

Raising the idle is normally not the real fix.  Has it always idled low?  I assume it ran and idled well at some point.  Idle adjustments don't un-adjust on their own as they are spring loaded and require a little force to turn.  A number of things can cause poor idling (low compression, low or no vacuum, dirty injector or injectors, weak coil, bad fuel, air leak, dirty VST, bad reeds etc etc).  Raising your idle may mask a more complex issue.   

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22 minutes ago, dabear said:

If that a old school three carb motor screw the air idle screws all in all the way to you feel a light touch stop than count the turns out to a full 1 1/2 turns out on all of your air idle adjustments if your cards are not a little restricted than it should idle a hair rich set up like this but will perform better on the low end and will idle in the water close to the correct idle speed . It it still sneezes and dies than more than likely the idle air fuel ports in the carb are a little dirty and restricted. If it a carb motor don’t play around with a lean carb condition it can do bad things to a two stroke in a hurry . They don’t like to be run lean . Hope this helps . 

OP says it’s an EFI OX66 

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There are alot of causes described above...you can fiddle with it, but, as mentioned above, I'd spend the $$ and take it to a 5 star Yamaha Dealer Mechanic...they are listed on the Yamaha site....

While I'm a huge DIY'r, idle and other carb settings are best left for the pros who do it every day.

 

dc

 

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Check the cabling entry and linkages for wear or cable stretch, I believe this engine is still dependent on the Fuel MAP ( ECM) knowing where the air inlet butterfly's are at ( TPS Throttle Position Sensor)  but last V Max 200 I say that had an injector failure failed full fuel rinsed the cylinder down and cooked! DC has a pretty good suggestion making sure it's healthy

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On 4/29/2019 at 2:32 PM, Northfl said:

Hiy guys, 

my outboard sneezes or coughs when at idle. If i bump it i to gear the rpm’s are 4-600. Is there any way i can adjust this to bring them up to stop the sneezing. Sometimes it also shuts off when it does it but starts right back up. What should the rpms be at idle in gear? I read somewhere a while back that they should be around 8-900. If i remember correctly.  Other that that issue motor runs great

 

 

Thanks for any help

Idle adjust on carb engine is a turn of a screw and straightforward. It is detailed in my Yamaha outboard owners manual. Mine is older, slightly different engine. Should be same process if you have your owners manual, check there first or a Yamaha or Seloc would outline it. I prefer the Seloc as I think its better written for shade tree wrench turners. If you don't have manual maybe it is here. Couple pics below to give you idea on process. https://yamahaoutboards.com/en-us/home/owner-resources/all/owners-manuals

IMG_6342.jpg

IMG_6343.jpg

IMG_6341.jpg

IMG_6344.jpg

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