Search results

I have a 2017 KTM RC 390 race bike. I have removed the coolant thermostat and the bike has 2019 radiator and fan. The bike runs great without any issues. The coolant is disappearing from the coolant reservoir and I cannot identify the exact issue. I drained the coolant, checked with vacuum...

My motorcycle died on track at a very high speed and I think it is due to the charging system failure. I have antigravity Lithium Ion battery that cuts off the power when the voltage drops below a threshold. I charged the battery and started the bike, the battery continues to drop the voltage...

I changed my radiator and removed the thermostat. When I refilled it with water wetter, it filled up pretty quickly with probably about half a liter in the radiator. I filled the about 0.3 liter in the compensating tank. After a few track days and races, I saw that my compensating tank is empty...

I have removed the mid pipe and the muffler, but I cannot get the header pipe out. It seems stuck in the frame. I have TRex racing frame sliders, and unsure if that's causing the problem or it is just a pain to remove header pipe. Also, I got Tyga WSS300 exhaust, however, the header pipe and...

I was wondering what sprockets and chain would be good for for racing.

The fuse 7, which is instrument cluster/control unit fuse (10A) keep blowing off. I disconnected the instrument cluster and the fuse still blew. I checked OBD codes and it has a P0108 code, which is "Manifold Absolute Pressure/Barometric Pressure Circuit High Input"; not sure if it is related to...

I have a 2017 RC 390. I mounted gopro on the instrument cluster. After one session, my instrument cluster stopped working. The motorcycle runs fine, but the nothing works on the instrument cluster. I am not exactly sure if it's stopped working because of the gopro or there is some other issue. I...

I was wondering whether to put Motul SAE 10W or Motul SAE 15W in my stock forks. I am 140lbs and wants to make the forks stiffer for racing.

I was wondering what's the best option for racing. I am leaning towards powercommander with quick shifter and wanted to see if somebody has experience with other fuel controllers and could compare it to powercommander.

My 2017 RC390 has engine light on and it's not going off. The OBD2 tool shows the following three codes P0500, P0112, and P1201. I am wondering if my motorcycle has any serious problem and needs to be repaired. I cannot find KTM error codes list that describes these codes; I am especially...

I am using competition werkes cat delete pipe with stock exhaust. There is a leak where the cat delete pipe is clamped to the header pipe. I am using stock clamps and exhaust gaskets and have tried new gaskets. I have also tried Permatex Ultra Copper Silicone gasket maker. However, it still...

I have medium rear (140mm) and soft front Dunlop slicks. I ride in B group and use tire warmers. How many track days would these last on intermediate pace? Does it make sense to use them till the wear bars? I know slicks are overkill, but I use them anyway for better grip.

Context: I have 2017 KTM RC 390 with Dunlop Q3+ and Puig metal valve stems (https://www.revzilla.com/motorcycle/puig-90-degree-valve-stems). I use Woodcraft tire warmers and run 32-33 hot in the front and 26-29 hot in the rear. I have done more than 20 track days with two sets of Dunlop Q3+ and...

I am upgrading master cylinder, brake lines, and brake pads. I was wondering if aftermarket front brake rotor, e.g., Galfer rotor, would further improve braking performance over 320mm stock rotor. I am using the bike only for the track and the stock front brake really sucks. Are there any...

I engaged front ABS quite a few times on track after straights; I didn't even realized that I am braking hard and it didn't felt that I am braking hard, but the ABS still engaged. Is the ABS on 2017 RC 390 conservative, so it turns on before the wheel locks up? I am removing ABS, so I wanted to...

I am using my 2017 RC 390 for track. As the track day goes by, my front brake lever becomes spongy and the lever touches the throttle. I changed brake fluid to Motul 660 this morning in the hope that brake lever feel would get better. The feel is better, but if I put enough pressure I can get...

I am installing driven clip on. I am missing the pin on the throttle side that connects the start-stop switch to the clip on. Any body knows type of the pin and length and diameter of the pin. Can I get it from a hardware store? Also, is the pin on the clutch side switches the same as throttle?

My RC 390 rear wheel moves while on stand and in gear with clutch pulled in. The bike is also very heavy to move when it’s off, in gear even with clutch pulled in. My mechanic said that turning wheel with clutch pulled in is normal. I wanted to check if it’s normal and if not what could be the...

I was on track yesterday and my RC 390 stalled a few times in turns on high speed. It felt like the rear wheel stopped for a moment and then started back again. I wanted to check if this is the typical RC 390 stalling problem or this could be something else? I recently removed the kickstand and...

I removed the kickstand and based on suggestions in other posts attached a 3.3k resistor but it still showing side stand down. I also tried 3.9k resistor. I have 2017 RC390. Is the removal method different for the 2017? I would appreciate any help. I am going to track on Saturday and have to...