Question about kawasaki KX 250 Motorcycles

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1991 KDX 250 uses alot of spark plugs.splutters and bogs down after riding at low rpm. plug comes out wet and black with no spark. new plug fixes problem immediately but happens again after about 5 litres of fuel. this problem did not exist when fuel had lead in it.fuel oil ratio have tried between 30-40:1.I am a mechanic by trade but this one has got me.I've owned the bike for about16 years and as I said it did not do it with leaded fuel. Oil I use is Motul 510 please help if you can

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Have u tried a hotter plug it worked on my car, also i add lead substitute to gas .try a performance coil and switch to electronic ignition also i did this to my bike and it ran a lot better.

Posted on Mar 20, 2011

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Posted on Jan 02, 2017

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2 Answers

How to fix oil from getting in the spark plug chamber


Is this oil in the plug wells or the cylinder?

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I have a John Deere 6330 that burns to much fuel, but has spells where it will drop rpm, and has no power.alot of black smoke during the bad spells.


Have you tried replacing the spark plug/plugs with a new set of quality US made spark plugs. NOT CHINESE IMPORT PLUGS either!

Cheesy spark plugs will fail under load if they are imports. Stick to the same heat range as the original park plugs. What brand of fuel are you using too? Stick to a quality brand of fuel and not the discount gas stations. Good luck.

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I have a yz450f 06 and its not running right its spluttering and poping on take off and cruizing at low throttle.


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Mar 11, 2013 | Motorcycles

1 Answer

Kdx 125 sputters just before the "powerband" kicks in


I used to ride enduro in the 1980s on a KLX 250 :>)

Sounds like you have two issues.

Your spluttering and jolting sounds like a defective Reed Valve, but could also be carburetor float level problems. If it is runs fine when on the power band, then the carb is fine. For the cost, I would replace the reed valve.

http://www.athenaparts.com/eng/sections/view/128/carbon-fiber-reeds-for-intake-reed-valve/page:6

Regarding the electrics, this could be a few things. Check all the earthing points, especially the one on the negative side of the battery. Take the wire off where it grounds to the frame, clean and apply Vaseline which stops corrosion and is electrically conductive. Check all the connectors that you can find. Pull them and make sure they are clean and sealed. Vaseline is good on these too. The specs below confirms it is rectified and regulated. Check the output voltage of the alternator with a test meter. Check the battery is as spec Battery 12v 3Ah and get it stress tested, or just replace it, if it older than 3 or 4 years.

You really need a good workshop manual. I had them for all my scooters and bikes.

Manual
http://www.servicerepairmanualonline.com/859/kawasaki-kdx125-kdx-125sr-125-manual/

Spare Parts List
http://www.cmsnl.com/kawasaki-kdx125-a3-kdx125sr-1992-europe-nr_model11759/partslist/

Specs
http://www.motorbikespecs.net/index.dyn?flag=2&model_id=1914354&make=Kawasaki

Voltage Main Fuse 20A
Ignition CDI electronic advance
Charging System 3 phase AC, 27V@4000rpm. Rectified 14.5@4000rpm
Spark Plugs NGK BR8ES
Bulb-Headlight Battery 12v 3Ah
Ignition Timing 10.5BTDC@1300rpm - 26.5BTDC@3000rpm

Engine Type Liquid Cooled 2 Stroke Reed Valve Straight Single Bore x Stroke 56 x 50.6 mm Compression Ratio
Displacement 124mL
Lubrication System Oil injection
Starting kickstart
Carburation Keihin/PE28
Carburation Main Jet 115
Carburation Idle Jet 48
Pilot Screw Setting 1.5
Red line RPM 10,500rpm


kawasaki KDX 125 Google Search

Apr 02, 2017 | kawasaki KDX 125 Motorcycles

1 Answer

New spark plugs turn black after going twenty miles


Hi
Make sure the air filter is clean (& not over oiled if sponge type)
Make sure that the pilot screws on #1 & #3 are 2 turns out and #2 is 2.25 turns out
Try turning 1/8 of a turn at a time
Also change to a softer plug - NGK DPR7EA-9 or equivalent as these stay hotter to burn more carbon off

Ride Safe
Bike-Doc

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1 Answer

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Check that your choke is working correctly
Your timing may be way off as well

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1 Answer

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Use a hotter spark plug. They do have different heat ranges.

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2 Answers

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You could have fuel with to low of octane rating.

Jun 01, 2009 | 2003 kawasaki KDX 220 R

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