Question about 2005 kawasaki KX 125

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Hi there, I can start the bike with no problem, but when I start to give it more throttle it automaticly cutts off. The spark plug is wet when I remove it. When you clean the plug the bike starts again.

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In colder weather, you might want to try running a hotter plug. Your bike likely came with a BR9EG or variation of that plug. Try running a B8ES - available at AutoZone or Advance for $2.

Clean your air filter, too.

Is this bike new to you? Do you know any of it's history - like when the last time it had a new top end? If it starts easily, you likely have decent compression. But if you just got it, it could need to have the jetting adjusted to suit your area.

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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1 Answer

Turns over but dose not start, spark plug sparking ok


Check you have petrol if the bike has not been run for sometime replace the fuel. Petrol ages and causes all manner of problems.
Are you trying to start the bike but it has gone onto reserve, move the fuel tap to the reserve position then try to start it. If the above fails, then try these:-
Is the spark plug wet when removed. If dry it sounds like the petrol is not getting through. Try opening the filler cap and leave it open, make sure the kill switch is in the run position. Try starting with the throttle full open. Does the bike have a manual choke try to start with the throttle shut, choke off, then full on, then while continuing to turn over move the choke lever in stages from fully on to fully off. I find on my Yam TW125 (winter and bad weather hack) that if I have not used it for a while sharp twist the throttle a couple of times no more than a third of a turn. Hope this helps.

Apr 08, 2014 | 2009 Daelim Roadwin R 125 FI

1 Answer

Kawasaki zx 750


Hi, could be a number of things like bad petrol, fouled spark plugs, tank not breathing. I would suggest first that you drain out all the petrol and refill with a decent brand (please, please do not use Supermarket brands). Use Esso this seem to have a much better blend of additives than other brand names. (Both of mine perform very well on this).
Water in the spark plug wells can also give this effect. Remove the spark plug caps and push some tissue down around the plugs if the tissue comes out wet then you need to find out why. For the next step only do this if the tissues come out dry on all spark plug positions.
Remove and check the spark plugs if the electrodes are wet let them dry off and give them a clean. Refit Sparkies and see if the bike will start. If it still back fires fit a new set of plugs and see if this cures the problem. Try to start again only this time open the filler cap on the tank. If this works the breather to the tank is not working, probably the tube is blocked.

Jan 30, 2014 | Motorcycles

1 Answer

I've recently had a problem with getting my bike started, i have managed to get it to start now, but it can only be started with the choke fully open and if i try to close the choke it cuts out. (Even when...


It is most likely fouled spark plugs. You can take them out and sand blast them, or buy new ones.
I had a CBR 954, and noticed that the spark plugs fouled out pretty easily because it runs so rich at startup (and I would shut it down during the 'warm up' phase).
Here is some more information for you:
From http://answers.yahoo.com/question/index?qid=20080806081249AALKibM
What are signs or symptoms that spark plugs in a motorcycle need to be changed?
There are several things that could hint at bad plugs.

- Hard starting.
- Slight to severe hesitation when you give the bike some throttle.
- Stalling, especially when you give the throttle a good twist
- uneven idling (tends to zoom up, or down, or sputters)
- After running the bike for a little bit, take out one of the plugs. If the end of the plug is wet, its not firing, and it could be oil fouling the plug
- take a look at the color of the end of the plug -- if it is white, its running too hot, and it can cause misfires
- look at the same area, and if it is covered in black soot, it can be poor gas mixture and dirt in your tank causing it to foul
Hope this helps.

Mar 13, 2011 | CCM RC 30 Motorcycles

1 Answer

Poor starter, plug gets wet, starts when bumstarted


First, get a fresh sparkplug. Next, charge the battery. Batteries usually only last two years or less. A battery that will not hold a charge will rob electricity needed for spark. On a bump start, the flywheel generates more electricity than a kick start. Give the throttle only one twist on your morning start if your bike has a power valve. The valve gives a shot of gas when the throttle is turned. Twist too much and the engine will flood. Please rate my answer. Thanks.

Aug 23, 2010 | 2000 Sym Husky 125

1 Answer

I have a 2003 yamaha warrior and wont start, i bel...


Check to see if your getting spark at the spark plug, if you are then look at the plug to see if it's wet, if not you have a fuel delivery problem. If it is wet, do a compression check. Get a manual of your bike for the spec on compression. It also tells you how to troubleshoot to find your problem. Read it.

Sep 26, 2017 | Motorcycles

2 Answers

Spark Plug gets wet too fast


Air filter may be blocked and inspect exhaust baffles and clean.

Apr 29, 2010 | 2000 Gas Gas EC 200

2 Answers

VERY hard starting takes way to many kicks usually play out befo


There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Give a strong kick through the full sweep of the kickstart lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Top rating for this answer? Thanks!

Jun 11, 2009 | 2003 Yamaha YZ 250 F

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