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Motor running sluggish and won't idle?

I have a 50cc Yamaha on a 16 foot key West boat. Lately the motor has been running rough when its cold i.e., not wanting idle and sometimes it runs at half the speed. After some warm up time it jumps up to normal rpm and takes off like normal?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 4 stroke Yamaha 50HP -Runs rough at all throttle levels

If it has the old points system you will need to set the points also adjust the carburatior screw the screws all the way in and back out 2 1/2 turns then get it to run turn the air mixture screws till it runs smooth. you want it slightly lean then enrichen it slightly, afterword shut the engine down and look at the plugs if they are gray black they are ok. good luck.

Posted on Jul 18, 2009

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SOURCE: 2003 yamaha 50hp 4 stroke, won't start

sounds like you are going to have to pull carbs off and clean jets also check tank and line for debries

Posted on Sep 03, 2009

  • 86 Answers

SOURCE: i have a 50hp 2007 yamaha 2 stroke

Did you change your fuel? If you are trying to use the same fuel from last year without being stabilized then that would cause your problem. I know that you already had your carbs cleaned but it sounds like something els got plugged up in them. If you have fresh fuel then I would take the carbs back apart and check your jets in the carb to ensure that there is nothing obstructing any of the orifaces in the jets. I am a boat mechanic and I have had to take carbs apart 2-3 times sometimes if they were varnished really bad to make sure I got all of the gunk out.

Posted on Dec 13, 2009

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1 Answer

Weight of 17 foot fibreglass boat and 115 horsepower Yamaha motor


the weight of the motor will be obtainable from the Yamaha web site in the specifications section the weight of the boat is any body guess as you didn't give a manufacturer name
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I have a 2012 mercury 6hp four stroke that will not idle without the choke on


Hi, Lee and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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.
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Runs rough when it's warm. comes and goes. has a 2.7. and then a 99 dodge carvan with a 3.3 does the same thing.


Chrysler Sebring Questions - Car running very rough ...

www.cargurus.com > Questions > Chrysler > Sebring

CarGurusMar 27, 2011 - It seems after car gets to a certain temperature it runs very rough. ... 2011 at 12:16 PM about the 1998 Chrysler Sebring 2 Dr LXi Coupe ... it.one day it washot out and it was running sluggish with rough idle.and ... I changed the altnator and battery its runs like its brand-new.now ... 2002 Chrysler Sebring LXi.

Chrysler Sebring Questions - Engine Power Loss After Car ...

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CarGurusNov 3, 2011 - Engine Power Loss After Car Is Warmed Up - Major loss of power after car has ... When vehicle is cold runs ok, sometimes a little rough but not bad. Full power. Allowed vehicle to run for over 45 minutes last night at idle, died on its own, car sat approximately 20-30 minutes. ... 2002 Chrysler Sebring LX.

* Chrysler Sebring/200 Convertible Club * • View topic - Rough ...

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However, the vehicle still suffers from rough idle under certain conditions: ... been resolved (I don't think he noticed that it happened only when warm though). .... The test will tell you its general condition without having to dig it out of the fender, ..... Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group rough ...
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1 Answer

'87 Yamaha ProV 50: Will cold start and idle well. After a full throttle 1-2 min run will begin & continue running very rough near idle. Will die without addtl throttle imput.


Hi Roderick:
I'm not familiar with your engine configuration, but on some of the older bikes, vibration eventually can cause a wire to break in the coil. When the engine is cold, the wires make contact and it runs, but as soon as it gets hot, the connection is broken or compromised and the spark quits or drives you crazy.
Since your bike runs when cold and quits when hot, I'd be looking for electrical rather than fuel problems.
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1 Answer

What is causing my yamaha jog rr 50cc scooter to go very slow


Hi, Hsmith514 and the usual suspects are:
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2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day.
Yamaha Jog cutting out and sluggish acceleration
http://www.scootertherapy.com/runslowpage.html
http://www.motorscooterguide.net/Manuals/Yamaha_CS50_Service_Manual.pdf
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1 Answer

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The "won't rev" part sounds like a preventative so you won't destroy the engine from cold start-up. The sluggish part sounds like bad fuel or spark plugs. Where do you buy your fuel and what octane is it? and have you Changed your plugs?

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1 Answer

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1 Answer

My yamaha 50cc moped struggles for power on a cold start,what could the problem be


Hi, Rachel797 and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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http://www.scootertherapy.com/startinghints.html
Yamaha YQ50 Service Manual
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1 Answer

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1 Answer

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