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i have two first gen RC390's with the Competition Werks pipe on both and custom ECU tunes MUCH more torque and increased HP, but, loud...

Yes, I would agree. I have another RC390 that I have the XC450 seals in and no issues... I would not use the OEM part number 901.... seals.

The flat face of the seal goes away from pressure, so the flat faces go against each other, inner seal flat face towards outside, outer seal flat face toward inside of motor...

Just did a quick check of the signal paths on 2015 wiring diagram, magneto pickups front and rear go direct to ABS unit, pulses varying in frequency representing speed leave ABS module on pin 8 / Blue/White wire then feeds LSU (mis labeled in diagram) ECU and combo instrument. 2018 is similar...

On the 15 /16 MY bikes the ABS tone rings supply a signal to the ABS module that is at a much higher frequency then what is sent to the combo instrument, the ABS module divides it down and supplies a cleaner lower frequency pulse train for the speedo. The wheel circumference can be adjusted in...

What year is it?

RC and Duke are the same, check out KTM parts finder. Same shock / swing arm etc.

Here are a few with just a quick search of the web, there are some threads here on the forum also... https://ktmtwins.com/products/lowering-kit-1 https://aomc.mx/KTM-LOWERING-KIT-390-DUKE-20-21.html

North American bikes do not have the wiring for euro mirrors with indicators (2015), it is not hard to add the connections as the same signals travel to the instrument cluster and you can just splice into that part of the wiring harness. I thought had a post with pics showing mine and how...

The MOSFET inputs of the Arduino can be triggered by wrapping 10 or 15 turns of wire around the spark wire BTW...

This info is based on earlier model 2015 / 2016, not sure if it is same on newer models, LCU is called out as A53 on page 8 of 9 on diagram and is located on left side of bike on frame near battery box.

That is module A61 on the wiring diagram, called out as Starter Lock Control Unit.

At this point I don't think that it is binary, I have found pics of the sensor with wiring and plug and it appears that 2 wires are for crank pulse coil and 3 for gear sensor. I can likely figure something out but not with out a newer sensor and a complete wiring diagram.

sent a PM...

let me see how far I get, I am likely going to need a newer sensor to figure this out.... I'll do more research...

Sort of, I do not have a wiring diagram of the later model, so I would need that to figure it out. I would NOT recommend the old just try randomly connecting wires as the connections go directly into the instrument cluster and the ECU. The newer style motor sensor uses voltage and ground from...

I think I have an answer, the early version has 8 wires, 1 for ground and 1 each for every gear position1 thru 6 and N, 'analog', that's 7 I/O pins on the ECU and microprocessor! So to save I/O and stream line things the newer sensor uses 5 wires, 2 would be power and ground from the ECU and 3...

FWIW, take it one step at a time, something with install is likely causing it to throw the codes you listed, check your install work / connections and if that doesn't clear codes disconnect PCV and reconnect as stock just to see if it makes ECU happy, then go back to PCV. Taking more things...

Look for corrosion / dirty contacts on relays and fuses, make sure all battery connections clean and tight.

You are correct! I seem to have clicked wrong one, Did you see how the 'usage' search works? enter part number and find all uses of that part... partsfinder is a great tool from KTM...