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Adjusting idle on 115 4 stroke Yamaha - Yamaha Boating

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Posted on Jan 02, 2017

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SOURCE: johnson 4 stroke 115 hp will not start. fuel

Sounds like and injector problem to me. If it was a 2 stroke I'd tell you to pull the carbs and clean them ,but EFI is a whole different story. Most certaintly a fuel problem, most likely injector related, you'll most likely need to go see a marine mechanic with the proper equipment to analyze, rather than start replacing parts you may not need.

Posted on Jun 23, 2009

  • 86 Answers

SOURCE: 2003 yamaha 115 outboard motor that dies when

I would check your fuel lines from the tank all the way to the fuel pump. It seems that you might have a pinched line somewhere. You can also bleed the fuel rail with the schrader valve on the end of the rail. If that wont fix it then you probably have a weak fuel pump.

Posted on Aug 09, 2009

  • 411 Answers

SOURCE: Yamaha 115 4 stroke engine when it is throttled up

Check the vent on the fuel tank. That's most common. Second, check the fuel filter.

Posted on Jul 06, 2011

  • 13 Answers

SOURCE: 2004 yamaha 115 4 stroke, Loosing rpms and alarm

maybe try replacing the fuel filter. it is possible that it has sediment in it and needs to either be cleaned or replaced (depending on the way it works)
these marine engines are difficult to work on, you may consider taking it to an actual shop to get it fixed

Posted on Jul 08, 2011

  • 49 Answers

SOURCE: Where is the idle speed adjusting screw on a 2008 Yamaha Royal Star Venture

is it carborated or fuel injection?

Posted on Dec 13, 2014

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Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Dirt Rider Magazine
YZ 125 Climbing high idle Yamaha 2 Stroke
How to Get Your 2 stroke Idle Perfect YZ125
Yamaha YZ125N1 Service Manual
OEM parts for Yamaha

Feb 17, 2014 | Yamaha YZ 125 Motorcycles

1 Answer

Yamaha 40 outboard stuck at full throttle won't idle

Sounds like accelerator butterflies are stuck,you probably need a good mechanic to sort this one out.try operate accelerator linkage on carburettors by hand but do not force, take off black air cleaner and spray penetrating oil onto butterfly shafts

Jan 27, 2014 | Clymer Marine Maintenance and Repair...

2 Answers

Yamaha 20 hp model 2010 petrol mixing with sump oil . problem came quite quickly at least a half litre increase after about 8 hours runing

Could be too much idling,4 strokes like a good run to get rid of fuel in oil,too much pitch on prop can also not allow motor to rev enough

Aug 14, 2013 | Clymer Marine Maintenance and Repair...

1 Answer

1992 115 hp V4 2 stroke had carbs done last year ran great all summer but this spring (as the fish are in the river) it will not Idle. It will run great at high RPM's

The carbs on 2 strokes are always needing a little adjusting, either your plugs are somewhat foulded, carbs gummed up from setting, restriction in fuel delivery, linkage could also be biding slightly. These are the general issues, any more would require a tech to get hands on and test them. But if your savy enough to adjust the carbs, just bump the idle up a tad after you check everything out. I am guessing that this may clear up on its own, but may need a bump.

Mar 27, 2011 | Yamaha 12V Air Pump

1 Answer

How to you properly adj a 2-stroke carb on a motorcross bike to keep from fouling the plug

Heat the bike up, give it a ride for at least 15-20 minutes. in idle, try adjusting the little black knob attached to your carburetor. This will adjust your air/fuel mixture. Adjust it little bits at a time, and then wait for a second before adjusting further (to allow the mixture to change). Pay attention the idle, and how the bike sounds. Adjusting that carburetor should help.

for more info on 2t carbs

Dec 25, 2009 | 2004 Yamaha YZ 125

1 Answer

I have a Yamaha TTR 225 4 stroke that is having issues starting

Carba/f ratio needs adjusting and use of the choke will help keep the idle circuits clean.

Nov 12, 2009 | 2003 Yamaha YZ 250

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