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Klx250 Help To Derestrict Please Klx250 Help To Derestrict Please
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Photo by Andy Miller, UK,
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  #1  
Old 18 Sep 2010
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Klx250 Help To Derestrict Please
Hi all
I have just recently returned to England from Germany on my KLX250,fuel injected model, 2009 reg.It was a great trip and the bike did fine however
it will not rev out above 7-8000 rpm so it seems a little restricted.Aftermarket parts seem expensive such as a power commander and performance exhausts, does anyone know how to improve top end speed without spending lots of cash...
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  #2  
Old 7 Nov 2010
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Hi I dont have an EFI model (2009 AUS model), BUT I can tell you all the things kawa have done to restrict it..

1. Check the throttle cable where it connects to your throttle bodies, it's likely there is a screw that actually stops the butterfly from opening fully. Turn throttle and see if anything stops it premature (they did this to carb models).

2. Exhaust is very restrictive... I got powerbomb headers as well (they are bigger diameter and lighter)

3. Now check airbox inlet - chances are its a tiny inlet into the airbox. Many klx owners replace the stock snorkle with a kdx200 one, or just pull it out and cut a larger opening. This is mostly responsible for poor performance.

4. Remove backfire screen from behind airfilter

5. Last thing is fuelling (carb was easy - it needed a rejet), but EFI I have heard has issues becuase it is not very easily remapped. I could be wrong, google it...
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  #3  
Old 7 Nov 2010
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Hi Thanks for the advice,i have gained more midrange power by increased
rpm by unpluging the speedo cable for a short ride this has cleared some of the restrictions in the ECU.The speedo cable/sensor is then reconnected but
the ECU unit will retain the new map and more midrange power.
cheers
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  #4  
Old 22 Dec 2010
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Location: lancashire
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klx 250 derestricting
HI
i was a little dissapointed with my klx too. After a few simple mods it will now show 85mph on speedo and revs quite freely.
1 KDX220 air filter snorkle (£20)
2 13t front sprocket (£15)
3 simple ecu mod dead easy to do cost nothing to do
bike has done 3500 miles since mods and have had no problems.
Any info needed please contact me Regards Simon.
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  #5  
Old 11 Jan 2012
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Quote:
Originally Posted by captain mango View Post
Hi Thanks for the advice,i have gained more midrange power by increased
rpm by unpluging the speedo cable for a short ride this has cleared some of the restrictions in the ECU.The speedo cable/sensor is then reconnected but
the ECU unit will retain the new map and more midrange power.
cheers

I got an KLX250 TOO, what do you mean with " by unpluging the speedo cable for a short ride this has cleared some of the restrictions in the ECU" what cable do you mean?
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  #6  
Old 15 Aug 2012
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What ECU mods (3) are you referring to ,and how did you do them?
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  #7  
Old 15 Aug 2012
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Quote:
Originally Posted by 844simon View Post
HI
i was a little dissapointed with my klx too. After a few simple mods it will now show 85mph on speedo and revs quite freely.
1 KDX220 air filter snorkle (£20)
2 13t front sprocket (£15)
3 simple ecu mod dead easy to do cost nothing to do
bike has done 3500 miles since mods and have had no problems.
Any info needed please contact me Regards Simon.
What 3 ECU mods do you mean and how do you do it?
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  #8  
Old 9 Oct 2012
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Not sure if this has been mentioned anywhere (first time on the Forum) - The easy KLX FI mod to remove the soft rev limits in the upper gears is as follows:-

1.0 discconnect the clutch switch wire connector (little black plug just under where the clutch cable enters the lever assembly.
2.0 use a short piece of thick wire to short out the 2 outer terminals on the connector block ~ a bit of neat insulating tape work should hold it in place.
3.0 use the tang on the plug upside down to keep it neat ~ i.e so the plug sits upside down below where you pulled it out from.

15secs to un-install - this mod lets you use all the revs in all the gears, most welcome when you go for an overtake and find yourself on the wrong side of the road with your bike slowing.

i did this about 9 months ago no problems have arisen. Note thsi does not actually make any more power appear but does allow you to use whats there.
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