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I just inspected my radiator again and it was missing about 0.2 liters of coolant. I filled up the radiator and turned on the engine and rev the bike, the coolant starts to bubble and overflow; is this indicative of blown head gasket?

@Superpacman13 In case of a head gasket or main case sealant failure, would there be a leak in the cooling system? I was wondering whether testing the cooling system using a vacuum filler would help detect the leak.

Thanks! I am also wondering if it could be just a faulty radiator cap. What are other symptoms of lightly popped head gasket? Does it affect performance?

I am using Red Line 80205 Supercool, which is deionized water with water wetter. I think I am losing about 0.2 liters; I have to put approx. this much to the reservoir. I am losing this much every track day. When I ride on track for a few sessions, any time I check my reservoir is empty.

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...

Thanks a lot man! I figured it out the other day. It was in fact the problem with the charging system. I installed Powertronics ECU, unplugged alternator battery charing connector and forgot to put it back. It was so frustrating, such a simple thing ruined my two track days. I was looking for...

Thanks for the help! The oil level is the same as I filled it up and it doesn't look muddy. I will look at it more carefully and see if I need to replace the seals.

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...

Of course, I read the description and other forums about it, but I am unsure if the features they mention are independent of the bike or depends on the bike, so it may be that for RC390 there is not much difference between Evo and Racing module.

Great thanks a lot! I was looking at RapidBike Racing: https://rapidbike.us/products/rb-racing-ktm-390-duke-rc Do you know how does RapidBike Racing differ from RapidBike Evo? Also, does RapidBike module allow increase the rev-limit?

Thanks! I saw rapidbike, but it's twice the cost of Powertronic and PCV. Do you know how does it differ and is it worth the extra money?

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

I did some research and it seems that Powertronic is better then PCV as it allows to increase rev limit and has both fuel and ignition controllers.

Thanks! Do you know where is the MAP sensor?

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 just figured it out; the fuse was blown.

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.