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Discussion Starter · #1 ·
Hello brothers, my name is Erkin and I am living in North Cyprus. I bought 2016 Duke 390 at 29.000 km. It's on second coolant mix problem and I bought it with that problem (Price was acceptable). I got bike and immediately start to look for this problem to forums and Youtube. I made an order for some parts (water pump seal set) like this one:

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I flushed old mixed engine oil out, coolant also. I cleaned oil filters, cleaned engine block with some diesel and simple engine oil. I cleaned radiator with distilled water. Took it out the old seals and cleaned there. I put in the oil seals with right way (gasket maker is on outer part of seals and grease is on inner part of seals). I filled the bike with simple 10w40 (for just test it on idle) car oil and Abro low silicate red coolant (I will use Motul Motocool when bike repaired).

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I started the engine and wait till it stops itself after 8 minutes. There was no oil increase in oil block as I see through oil glass. Just, there was white glass mist. There was no white or any colorful exhaust smoke. There was no any temp issue (it could not even use it's fan). I flushed oil and saw it was a bit like mixed but I thought maybe it's because old oil filter (I did not used new one on this test) and old mixed oil in oil block. I also flushed a bit from coolant and it was not contain oil.

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Meanwhile, exclamation light was everytime active on speedometer.

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And this is video of it:


Now... I need to ask to you brothers;

1. What I do wrong? Is there something I missed?
2. Can it be cylinder top head gasket?
3. Can it be cheap car oil (when bike gets hot maybe oil gets thinner and bike stops itself)?
4. What can cause this kinda engine shut procedure?

Thank you to all!
 

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I'm sorry no one reacted yet to your question(s).
It is a bit difficult to assess from a distance of course.
If the head gasket is the culprit you will most likely see air bubbles in the coolant when running the engine.
Why are you using car oil? In a wet-clutch motorcycle, you are supposed to use motorcycle oil.
I would also change the oil filter as this is a cheap part.
To check if the seals are the issue, you can try to pressurise the cooling system with air and a gauge and let it sit overnight (if it is not directly clear that the seal's leak.
The pressure gauge should not drop in pressure.
 

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Discussion Starter · #3 ·
@KTMasean Thank you for ur reply, friend. I did not see so much bubble in radiator water when engine running actually, cause I cannot make it work enough time to see what's going on.It can work at idle couple of minutes as I wrote but it stops itself almost immediately when you hit the gas. It has small amount of white smoke coming from exhaust with sugary smell. Because I tested the original seals and problem not solved, I suspect the head gasket and gathered the original gasket set. Now bike is in service. I am waiting what they gonna say about it. I hope it's gonna be okay soon :)

Note: I tested with cheap car oil cause it does stops itself and fill the oil with water anyway. Motul 5100 is a bit costy to test the bike in my country :)
 

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Yeah, I also hear of this method but never tried it before. I had an issue 4 months ago, and I needed to seal tiles in my bathroom. I had no idea what to use and how to do it. Unfortunately, I had no money to ask a specialist for help, which is why I went on the internet. After some searching, I understood that I should definitely use silicone sealant, but after that, I had to find information about silicone sealant and how to apply it. Luckily I was able to find a website sealwithease.com that had an article about silicone sealing and polyurethane sealant. After reading, I chose the best option, and everything worked out perfectly for me.
 
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