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Old 08-11-2016, 08:59 AM   #1
loosenoose
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frustrated with overheating problem.

i'm about to the point where i'm going to do something regrettable.
my 2016 duke 390 has been one problem after another for the last month. i just got the bike back from cycle shack. i had them put on a new rear tire, do the 2nd service, and asked them to do a radiator flush. they did the tire and service, but wouldnt touch the radiator, since it had been repaired from a minor crack. i took it home and did a radiator flush yesterday and used engine ice in the radiator. i also gave my 390 a much needed cleaning and chain lube. after riding around a bit yesterday afternoon, i noticed the temp gauge was pretty high. the bike got to sit for a few hours at my gf's apt, and when i got back on, it quickly heated back up to where it was earlier. i know the fan is working, because i hear it kick on after a little bit. i'm wondering if the pump seized now...
anyone have some good advice (other than 'dont buy a duke 390'?) the little duke is a lot of fun... just not lately.
it shut off on me this morning around 6:15am on my way to work.
i'm getting close to throwing ads up on cl and here. if someone does have a decent riding bike that they would like to trade, send me a pm. this guy was around $6000 otd like 3 months ago. i have put a few things on it.

i'd prefer to fix it, rather than get rid of it.
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Old 08-11-2016, 09:10 AM   #2
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Old 08-11-2016, 09:22 AM   #3
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First, get rid of the engine ice.
Use regular antifreeze meant for aluminum engines and water in a 50/50 mix.
Next, with the motor cold, fill the cooling system.
Leave the cap off and start the bike. As the bike warms up somewhere around 160-170 the thermostat will open and the coolant level will drop. Top it off from there and install the cap.
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Old 08-11-2016, 09:24 AM   #4
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There seem to be a lot of problems with the little KTM's. I have an RC and could sell it if I wanted to take $4500.00 or less. Good luck. I am going back to Yamaha's.
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Old 08-11-2016, 09:27 AM   #5
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i squeezed the radiator hoses after i filled it, trying to eliminate any bubbles, nothing came out. i have the coolant tank filled, too.

also, i didnt say it in the OP, but i drained the coolant from the drain plug on the water pump.
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Old 08-11-2016, 09:29 AM   #6
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just saw the last 3 posts. thanks patrick. i'll give that a try as soon as i can.

stevie, yeah, i'd take about the same. lol. i know it would be at a loss, but it. i want to ride more than i want to look at a parked bike.
every time i go into cycle shack, the cbr300r for like $3000 stares at me with a look that says "i told you so!"
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Old 08-11-2016, 09:39 AM   #7
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Quote:
Originally Posted by Stevieboy View Post
There seem to be a lot of problems with the little KTM's. I have an RC and could sell it if I wanted to take $4500.00 or less. Good luck. I am going back to Yamaha's.
maybe if i take one of those little racing radiators you see in older civics, and put that on the duke, it might be able to keep it cool. also i'll run a full liquid nitrogen setup instead of conventional coolant. maybe just maybe that will keep the 390 cool.
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Old 08-11-2016, 09:57 AM   #8
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At least you haven't blown the head gasket and/or warped the head........yet. I had better luck with thirty year old Yamahas than with the little KTM. And so have my friends.
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Old 08-11-2016, 10:02 AM   #9
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the 91 vfr750 i had back in the day was so much more complicated and older and ran like a beast. this thing is high tech (at least compared to what i'm used to) and simple and ktm still it up.
i wonder if the 390 was assembled alongside the more expensive duke models, would the quality be better?
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Old 08-11-2016, 11:09 AM   #10
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my 690 duke ran a lil warm but nothing carzy. use strait water and work on the bike 100% yourself. they are easy, i can do it.
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Old 08-11-2016, 11:19 AM   #11
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you used just water on your 690?
i'm not familiar with how the 690 does day to day, but the 390 runs hot normally. why would straight water be good in this application?
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Old 08-11-2016, 11:28 AM   #12
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Remove Radiator cap...
Open Bleeder Screw three turns...
Tilt Vehicle slightly to the right...
Pour coolant until it emerges without bubbles at the bleeder screw, then mount and tighten the bleeder screw immediately...
Fill the radiator completely with coolant, mount the radiator cap...
Start the engine and let it run warm...
Stop the engine allow it to cool...
When the engine is cool, check the coolant level in the radiator and if necessary add coolant...
Remove the cap on the compensating tank and add coolant up to the Max. mark...replace cap...


(((LINK)))
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Old 08-11-2016, 11:42 AM   #13
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hey, thanks for the link. i havent seen the repair manual online!
i did this yesterday, and after filling it up with engine ice, which i have heard so much good about from the brains local to duke 390 forums, it ran hotter than i have ever seen it.
when i get off work, i'm going to see what the level looks like in the radiator. this morning, the tank was completely full, but i'll check it again.
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Old 08-11-2016, 12:20 PM   #14
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Old 08-11-2016, 12:55 PM   #15
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i'm not going to disagree with you there...
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Old 08-11-2016, 03:49 PM   #16
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No using only water is a bad idea. Water will boil, turn to steam and could crack the block. Also coolant prevents corrosion. 50/50 is always a safe bet
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Old 08-11-2016, 04:47 PM   #17
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dude you and bikes....... I hope patricks advice solves your woes.
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Old 08-11-2016, 05:19 PM   #18
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yeah man, no kidding. i bought a new one because i'm sick of like this. didnt think this kind of would happen.

seriously though, if anyone is interested in a 2016 ktm duke 390 with about 6000 miles on it, and misc goodies, let me know. if you are good at bike repair, this could be your baby. i paid about $6000 out the door, but would take $4000, or older bikes in good shape mechanically and bureaucratically.
i'd really consider the out of a grom.
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Old 08-11-2016, 05:30 PM   #19
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Old 08-11-2016, 06:37 PM   #20
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Quote:
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yeah man, no kidding. i bought a new one because i'm sick of like this. didnt think this kind of would happen.

seriously though, if anyone is interested in a 2016 ktm duke 390 with about 6000 miles on it, and misc goodies, let me know. if you are good at bike repair, this could be your baby. i paid about $6000 out the door, but would take $4000, or older bikes in good shape mechanically and bureaucratically.
i'd really consider the out of a grom.
I'll trade you straight for a Harley street bob.
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