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250 ktm sxf throttle body to yz250f conversion Can it be done ?
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1) There are different electrical values used by different injector types and manufacturers.
The easy check is to measure the resistance (ohms) of each injector and compare them.
Disconnect your stock injector and measure across its terminals with a multi-meter set to resistance (ohms).
Measure the new injector you plan to swap the same way with the same meter.
If these two numbers vary by more than 10% you may be risking your ECU to do the swap.
2) There are different injector sizes which are specified by each engine manufacturer. Injectors are either fully open or fully closed. The ECU sends a pulse of a certain length to the injector. The length of open time multiplied by the injector size is the amount of fuel delivered. Obviously if you go to a much larger or much smaller injector you'll be running rich or lean respectively. If you can't find out the exact injector flow rates for each bike up front, you'll have to be careful when you start it the first time.
With item number 2 in mind, and the probability that the airflow is improved (or at least changed) you're almost guaranteed to need to re-map your bike for the swap. With the YZ that may be pretty easy if it's within the range that the stock ECU and power-tuner can adjust.
With the price of used parts for 250F's being fairly low, it would be fun to try it. If you can't map the new parts correctly, you can probably find a shop to help go beyond what the YZ ECU can.
Luckily, the bike owner knows 2 different guys with Dynojets
Will do a couple of runs with the Yam keihen, then swap it out and compare the #s. The Vortex is easily accessible in its current but NOT FINAL LOCATION. I'll jot down current settings, then play with it to see if more AND useable rwhp can be had. I'll update the post with RWHP from both set ups
Surprisingly the KTM part# is the SAME for the throttle bodies from the 250,350 and 450. Fyi. Using a 17 450 body.
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