Question about 2007 kawasaki KLX 250

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2004 kx 250 dont know the mods but the bike was in some big time races.mixing synthetic with 108 octane at 32-1 as told by owner,wont idle puts along sputtering no problem getting into it no bogging at all.rode my 8 year old around for 3 hours at a low sputtering speed fouled the plug.oil is coming out the tail pipe maybe normal

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  • markbruno4 Sep 14, 2010

    wood you stick with 32-1 or move to 40-1

  • markbruno4 Sep 14, 2010

    yes

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Yes. This is completely normal. On two stroke engines they need to run at high rpm's to keep the plug clean. When you ride around without going up on the power band then it gets way too much fuel. And with oil mixed in with the fuel then it will foul plugs. It won't hurt anything internally. You will just have to continue changing the spark plugs.

Posted on Sep 14, 2010

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Hi im just wondering what the fuel mixture should be for my 1996 rm 250 ? thanks mark


For a 250, you can get away with a leaner mix like 40:1 but I still race a 250 2-stroke from time to time for fun and I run 32:1. More oil = less friction, less heat, better sealing, etc...

Any idea what it was jetted to run? the difference between 40:1 and 32:1 is fairly minimal and if the bike is jetted fairly well I doubt you will tell a difference. If the plug is black it is too rich.

Sep 12, 2011 | 2003 Suzuki RM 250

1 Answer

Would it be possible for you to let me know what oil /fuel ratio can be made for a CR125cc 2004 HUSQVARNA. well the previous owner had 40:1 yet he may have been trail riding how can i alter my performance...


Yes 40 - 1 mix is a common race mix and if you dont do weekly maintenance and regular rebuilds you would be better at 32-1 33-1 mixes as this is more oil to fuel mix so better lube and lower burn temperature inside the motor.
when changing to higher oil mix make gradual changes to the fuel mix 1 tank at a time and record your ration as your bike will respond to the changes sometimes well sometimes bad but if you do small steps and record the result you will know what mix is best for your area and bike
In short the more oil you can give it and still ride well the better fore engine life (within reason) but you will lose some performance compared to less oil mix like 40 - 1 ratio (race mix)

May 22, 2011 | 2004 Husqvarna CR 125

1 Answer

My 1983 wont start but it back fires through the exhaust andits a two stroke liquid colled and some one told me the valve is in wrong what could be the problem


Maybe they meant the valve is stuck or sticking....Be sure that you have factory recommended spark plugs because I know from owning a bike that it will definitely make it backfire.by trying to run hotter or weaker plugs If you have wrong plug...gap is important also....I realize a lot of plugs will cross over but people who sale them wont discuss the fact that it could make it run ok but not like it was meant to run.....It is the same with some racing plugs...If you dont run them wide open like you are racing the spark plug will make it backfire or spit and sputter...also wont idle correctly....and todays fuel isnt what it used to be...I would run 93 octane...I dont know if you have to mix it or not but 93 is best for all...It is a lot cleaner,stronger...but dont change fuels around a lot this will also affect it...So other than carb or choke adjustments this is good advice and could be your problem or would add to a problem.The engine is designed and set to run the plugs that they recommend..........hope this helps..................................metalpoet

Mar 01, 2011 | Yamaha YZ 125 Motorcycles

1 Answer

99 yz125 burning off piston edge at high rpms


Higher octane fuel is needed from what you describe. Without knowing where you are located and how hard you ride the bike, it's impossible for anyone to offer any jetting advice. Higher octane fuel will likely help, but if you (or a previous owner perhaps) have shaved the head for higher compression, you might have to run higher octane racing fuel.

Also - check to make sure the pipe is sealed well at the head pipe connection - if not, it will **** air at high RPM and can cook your piston.

Check also for leaking crank seal on the flywheel side (left) which can also **** air but will normally be accompanied by a very irradic idle.

Apr 12, 2010 | 2004 Yamaha YZ 125

1 Answer

What is the premix oil ratio i should use on my KTm 2004 250 exc 2 stroke and what kind of oil should i use?


32:1
Any pre-mix synthetic.
Maxxima is good
Golden spectro
Or even what the factory recommends.

Aug 27, 2009 | 2004 KTM EXC 250 Racing

1 Answer

Bought a used 2004 Suzuki RM 250 and need to know why it keeps fouling plugs i mix gas 32:1


the mixture may be too much one of two things you can do
1) switch to synthetic oil mix or
2) go to a hotter plug it will last a little longer but will still foul

Aug 16, 2009 | 2004 Suzuki RM 250

2 Answers

Wich oil should i use for my kx250 98 mod


go for repsol tranmissiones and motul racing 2t oil

Jul 17, 2009 | 2003 kawasaki KX 250

1 Answer

Why is my kick starter ceasing? I just changed the oil in my 2004 kxf 250, and went to ride it and it would just die and the kick starter ceased. Please help..


I have same bike and know some about it. and i race a lot. your bike has a crank or rod whatever you want to call it but it could be cracked, broke, or even could have dirt on it.

Apr 23, 2009 | 2004 kawasaki KX 250 F

6 Answers

Kawasaki kx 250 fouls spark plug in 30 minutes


You definitely need to change the oil mixture to at least 40:1, use a good grade of 2 stroke oil. You do NOT need to return the bike. I'd highly recommend using an NGK B7EV spark plug. A hotter plug will stop the premature fouling. I would not recommend you decrease the oil to 50:1 because you are essentially robbing the engine from adequate oiling for the piston, KIPPS valves and the bearings. The hotter plug will make a huge difference but remember if he gets to the point where he is able to ride the bike to it's potential he will need to run the cooler plug, B8EV or B9EV. You can also use a cheaper plug in the same heat range, B7ES or B8ES. Those plugs should cost about $1.25 ea. and are an affordable cost of running the bike. It's not uncommon to replace a spark plug frequently, it's the nature of the 2 stroke engine.

Dec 08, 2008 | 2003 kawasaki KX 250

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