KLX 300 ECM connector

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Old Apr 3, 2025 | 02:45 PM
  #21  
Olsen29's Avatar
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Thanks for your response!
I have purchsed the controler from Dmitri and will go that route.
At the moment I have only the secodary throttle plate removed and KDX snorkle.
I have, at the moment an Innovate LC-2 Wideband hooked up to see how the stock handles fueling so I know what to expect when I install the BB351 kit.
 
Old Apr 3, 2025 | 03:02 PM
  #22  
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Originally Posted by Olsen29
Thanks for your response!
I have purchsed the controler from Dmitri and will go that route.
At the moment I have only the secodary throttle plate removed and KDX snorkle.
I have, at the moment an Innovate LC-2 Wideband hooked up to see how the stock handles fueling so I know what to expect when I install the BB351 kit.
Can you post some photos of your wideband O2 setup? I'm planning to hook one up to my bike as well. Are you running it off a sperate battery or do you think the KLX's charging system puts out enough wattage to run the wideband?
 
Old Apr 3, 2025 | 07:25 PM
  #23  
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Happy to share.
The wideband controller only draws 3 amps so I don't see that as a problem.
I used a 3 inch piece of closet pole that was a great fit in the joint at the head pipe.
The controller lives in the original tool pouch on the rear rack.
I previously added a 4 fuse panel powered by a relay controlled by the tail light wire so power went ground were easy.
This is the Bosch O2 sensor in the pipe extension
This is the Bosch O2 sensor in the pipe extension

 
Old Apr 3, 2025 | 09:16 PM
  #24  
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Nice work! Keep us posted on how you get on with adjusting the fueling for the bike based on the wideband sensor readings.
 

Last edited by hobospeed; Apr 4, 2025 at 12:04 AM.
Old Apr 3, 2025 | 10:35 PM
  #25  
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Originally Posted by hobospeed
Nice work! Keep us posted on how you get on with adjusting the fueling for the bike based on the wideband senor readings.
Will do!
The fuel injection on these are pretty simple I believe and it's the cold start, and full throttle that scares me. If only we could obd into these and track fuel trims.
I will get the pictures together and share the Google album so there is one location of the bike and my mods as I complete them.😁
 
Old Apr 13, 2025 | 11:05 AM
  #26  
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Originally Posted by jimbu
Finally, incase anyone wants to know, the Healtech gear indicator "black/green" wire goes to the #3 pin on the ECU connector, "crankcase sensor +", the wire is green/yellow.
Thanks for following up on this. Does anybody know the tooth count on the flywheel?
I have the healtech logger hooked up. I tried the coil first, then injector then yellow and white crank shaft finally found the crankshaft+ good signal.
Now I need a tooth count on the pickup. Anybody know off hand?
 
Old Jun 7, 2025 | 08:29 PM
  #27  
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Originally Posted by Olsen29
Did this die on the vine?
It's hard to belive we are still locked out of this ECU with so many out there!
I have a 2024 and I am going to log AFR while stock . I have a 351 kit to install and see what I can do to manage fueling.
Mostly worried about cold start, open loop full throttle, I think the stock ecu with the O2 sensor will do okay in most situations.
Can EJK make a piggyback that trims fuel down from stock for full throttle?
The EJK is not a good choice, especially for a 351cc.

The Powercommander and a bigger injector, or a standalone with a bigger injector.

Keng now has a 402cc setup.

Jeff Higgins on youtube did a 351 build...
 
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