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Well, to be fair the whole point of a shorty is to gain bottom end, which sacrifices top end pull.
If STIC was a .115X needle tube, that is impressive. My experience is that the STIC Super X is considerably more powerful than the std PWK.
And less back pressure & heat . That’s why they ran shorties in the nationals.
It’s all good 👍
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I just got word from the dealer that my 300SX is unfixable, bc KTM doesn't have and isn't making the power valve actuator motor. Service guy said all kinds of KTM brands customers pretty pissed right now.
So lucky to find a used 40hr actuator motor today off ebay. Close one. Need to sell it off before the next dooms day event. It's hands down the best bike I ever rode. No different than a troubled Hottie. She gotta go.
Does KTM actually make that motor or did they not pay the supplier that does?
Likely they get it made by an electronics company, However, it appears specific-application enough that it is likely only available through KTM as an OEM part.
I have a 2025 150 and am looking at mods. What did adjusting the TPS and resetting the power valve do for you/why was that done?
If you mod, you need to be sure if you need new mapping or not.
Also, there's an Italian Co that has a carb conversion kit w/ECU for the new set-up.
How would even know whether or not new mapping is required? Just slapped a shorty on there, but I have to imagine that the system can account for something like that. Definitely not going to a carb as not fiddling with jets was literally why I went with this bike over a Yamaha.
The EFI on TBI bikes definitely does not sense or adjust for a different muffler. There are no sensors for that feeding back to the ECU. Not saying that your shorty does or does not require a remap, but the ECU certainly isn't doing it.
There's not an exhaust sensor, but wouldn't it sense a lean/rich condition and accommodate?
How would it know if it's lean or Rich if it's not a closed system?
The map sensor would compensate. Some. If the engine breaths different the intake pressure is different. Fwiw
Been racing/riding for 30 years. I understand carbs and hate fiddling with them. I have no idea how these fuel injected bikes work/where the sesnors are, what is measured, or how they compensate for different conditions.
The new silencer is going to be less restrictive on the exhaust side, one would assume this would create more of a draw on the intake side. More air=more fuel=more power..... At least on the old carbed bikes.
There is a table of fuel and timing curves available to select from in relation to atmospheric conditions, i.e. pressure. It does not recalibrate by an O2 sensor detecting rich or lean conditions.
I remember ppl seizing their bikes after installing a new pipe without checking the plug color or listen to how the bikes sounds/running.
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