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Rough idle 2 cycle outboard

Rough idle at any engine speed up to full throttle. At full throtle engine runs smooth and is very strong and responsive. Below full throttle very rough, engine shakes but does not stsll out.

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Sounds like u need to do a tune up on it. clean the carb, new plug

Posted on Nov 25, 2008

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HOW TO ADJUST THE CARBURETOR ON A SMALL GASOLINE ENGINE


We all have some frustration with small gasoline engines from time to time. Often, do to our own weak maintenance schedule we put these engines away for the season without paying any attention to the recommended procedures in the owner manual. Today I am going to talk you through the steps to adjust a small gas engine's carburetor.
1. Read through the whole list before you start adjusting.
2. Close both jets GENTLY
3. Open the Low speed 1/4 turn
4. Open high speed jet 1 1/4 turn
5. Start engine.
6. Adjust low speed until idling smoothly.
7. Open her up wide open.
8. Adjust High speed until engine transitions smoothly from idle to high speed without bogging.
9. Shut engine off. Let it cool.
10. Once engine is cold. Fire it up and let it idle for 30 seconds. Open it up wide open again. Adjust if necessary.

Please Note - It is best to adjust the carburetor at the beginning of the usage season. In other words, don't adjust your rototiller engine in the dead of winter when you won't use it in those conditions. Regards, Joe

on Dec 31, 2009 | Sport & Outdoor

2 Answers

I have a 2004 60 hp yamaha 2 stroke outboard engine that doesn't start or run well. Once warm and in the water it will idle in nuetral and also in gear. It accelerates in neutral but will die or lack power...


Every sympton you are describing here can be attributed to fuel starvation due to blocked jets and or water in carbs, when your engine dies does it die with dry plugs, or wet oily ones?

Mar 25, 2011 | Sport & Outdoor

1 Answer

My Yamaha Enticer 340 wont idle off of choke. What could be the problem? I have taken the carb off and cleaned all the jets. It idles on choke and will run off choke if the throttle is at half or full,...


your idler jetsa are blocked ,on this carb their should be an air screw as well so it might not be set right ,this air screw should be about 1-1/4 to 1-1/2 a turn out as a rough guide .Now another favourite trick of mine is to open the drain screw on the bottom of the carb then pull the feed pipe off the tank from the fuel shut off and fill the carb with brake and clutch cleaner ,spraw it down the pipe and leave overnight ,this will hopefully unblock any very small jets within the carb body ,Yes i know its a bodge and its not the correct way but it does work on old engine with carbs like my aux outboard or my motor bike .

Dec 21, 2010 | Sport & Outdoor

2 Answers

I have a older model # 30 jiffy ice auger and i can not seem to keep it running consistanly. I was wandering what the carburator adjustments are. The low idle screw and the high idle screw where do I start...


Hello Randy. I can talk you through making adjustments to your Jiffy ice auger engine.
1. Read through the whole list before you start adjusting.
2. Close both jets GENTLY
3. Open the Low speed 1/4 turn
4. Open high speed jet 1 1/4 turn
5. Start engine.
6. Adjust low speed until idling smoothly.
7. Open her up wide open.
8. Adjust High speed until engine transitions smoothly from idle to high speed without bogging.
9. Shut engine off. Let it cool.
10. Once engine is cold. Fire it up and let it idle for 30 secs. Open it up wide open again. Adjust if necassary.

NOTE 1: The trick with the Jiffy's is to tune them during cold (ice fishing) weather.
NOTE 2: Low speed screw,the one on the left.
NOTE 3: High speed on the right.

Good luck ice fishing! Regards, Joe

Dec 31, 2009 | Sport & Outdoor

1 Answer

2002 Merc. outboard overheating


it sounds like your lower unit pump is going out
hook it to a fresh water hose and run the engine and see if more water comes out of the exaust if it is more then i would replace the lower unit pump check and see if the screens on the lower unit are plug up with seaweed and clean them that would restric the flow of water

Aug 30, 2009 | Sport & Outdoor

1 Answer

Need to know how to set up carb on 1985 johnson outboard. front adj on the carb got moved looking for starting point to get me close to running.


try disconnecting the throttle cable, loosen carb linkages, assure that both carbs are FULL closed....tighten linkage - and cable ...check for FULL open and close with the throttle....this will be your starting point, advise to get a service manual for your outboard model to correctly adjust the carbs for max performance....GL hope this helps..

Jul 04, 2009 | Sport & Outdoor

1 Answer

Kawasaki KE100 over revving


Clean your carburator, incl. bowl and most important the jet located in the rigth side of bowl. Good luck

Feb 08, 2009 | kawasaki Full Suspension Mountain Bike Men

2 Answers

I have a 1987 mercury 9.9 outboard drive problems


the inside of the prop has a rubber between the prop itself and the inside splines to act as a shock absorber,say if you were to hit a rock. that rubber had spun out and the splines are turning inside the prop. the prop is screwed. seen it 100 times before.

Aug 25, 2008 | Sport & Outdoor

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