Starting issue - KTM Duke 390 Forum
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post #1 of 15 Old 10-03-2016, 02:20 PM Thread Starter
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Starting issue

Right i have noticed a starting issue with the Duke, if (like yesterday) i go out for a fast ride (R6 and CBR 600RR for company) the duke wont start for ages the next day?? , if i have a mad 15 mins ride from work it wont start for ages the next day, if i just chug about ( less than 7000 rpm) it starts fine every time?
I have fitted a K&N and iridium plug, both made no difference to the starting, the bike will turn over and fire (chuffing sort of noise) but wont run until about 8 to 15 attempts, it smells like its over fueling, doesn't matter if the weather is hot or cold or if i give it throttle or not.

Anybody else have this or any ideas ??

Mark
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post #2 of 15 Old 10-03-2016, 04:20 PM
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Just to clarify, are you saying this issue was already present prior to fitment of the new plug and K&N?

Less is more - You can only use 150hp .001% of the time, but you can use 150kg 100% of the time ...........


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post #3 of 15 Old 10-03-2016, 04:44 PM Thread Starter
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Yes mate it was , i thought because it was low mileage (584 miles in 3 years) it might have been a plug/filter/service issue, but once i serviced it and then when for a full throttle ride the next day it wouldn't start again, at first i thought auto choke/ fast idle ( but not sure it has one?) as that was an issue on my R1, then i thought maybe it needs a bit of throttle , but no, then this morning it wouldn't start and smelt of fuel, rode really well once going no misfires still does about 55 mpg and hit 104 mph yesterday so it goes ok, its my only transport and i ride all year round so i need the bike to be reliable, i will check the air ways at the weekend, i also have tried super unleaded and normal unleaded ??
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post #4 of 15 Old 10-03-2016, 04:57 PM
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have the valve clearances been checked?

Less is more - You can only use 150hp .001% of the time, but you can use 150kg 100% of the time ...........


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post #5 of 15 Old 10-03-2016, 05:05 PM Thread Starter
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as far as i know, invoice says they were done and there is evidence of gasket sealant around the cam cover?
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post #6 of 15 Old 10-03-2016, 08:47 PM
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Personally I'd still be wondering about the valve clearances ('cos I don't trust bike dealers). Look at it this way - if you check them and they are as fine as that invoice implies then at least you don't have to piss about taking the cams out......and if they're tight - well you'll be even more glad you checked them

Having said all that, 3 of the valves were tight on my (2015 model) , It has regularly been run at 9000rpm round the local bypass, but it's never had any starting issues.

I take it you have a 2013 model - I believe that there was a revised valve clearance on the 2013 model to deal with a warm start issue ( I realise you are describing a cold start issue).

When was it last in a bike dealer? - might need an ECU reflash as KTM have revised mapping (probably several times) since 2013.

Based on other member's experiences I think it will get better anyway as you put miles on it.

You could try doing a 15 minute reset

A couple of (the many) possibly relevant historical threads :

revised valve clearance

390 duke wont start
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Less is more - You can only use 150hp .001% of the time, but you can use 150kg 100% of the time ...........


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post #7 of 15 Old 10-03-2016, 10:48 PM
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Also, try starting without touching the throttle. If you touch the throttle, the FI will just cut the spark and it'll make the chuffing noise. Also, after a while it'll start smelling like over-fuelling due to the unburnt fuel you keep dumping in it.
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post #8 of 15 Old 10-04-2016, 02:08 AM
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i would say like the others and also until you find the cause of the problem you will let your bike at idle 1-2 minutes each time before turning off the engine.

for some reason after turning off the engine there is a lot of fuel into the combustion chamber and that makes it difficult to start. This could be a lot of things, ie spark plug failure, valve clearance, IAT sensor/ MAP sensor faillure, etc.
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post #9 of 15 Old 10-04-2016, 07:37 AM
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Quote:
Originally Posted by duke200 View Post
This could be a lot of things, ie spark plug failure, valve clearance, IAT sensor/ MAP sensor faillure, etc.
Presumably if a sensor failure, the engine warning light would be on?

Less is more - You can only use 150hp .001% of the time, but you can use 150kg 100% of the time ...........


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post #10 of 15 Old 10-04-2016, 11:08 AM
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I suggest you run some injector cleaner through the fuel system. If the bike was sitting for long periods over three years the injector may have become gummed up with petrol varnish to the point that it cannot spray properly at the minimum/idle setting needed to start.
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Cheers, Will

"If you don't know where you're going, you might wind up somewhere else."
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2015 390 Duke
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