Every time I read one of these threads I just have to LOL if only the guys who have starting issues would just learn to crack the throttle when pressing the start button as is indicated in the owners manual your bike will start every time!
I have a 2013 and my buddy has a 2015 and they both had starting issues like everyone here describes.
After I showed my buddy how to start it, he has never had to press the button more than 1 time on any of the rides we have been on hot or cold, in gear or not it always starts!
So let me clarify what will not work
It won't start if you use NO throttle, it won't start if you attempt to add throttle while cranking. It will not start if the throttle is open too much. It won't start if you have to much and adjust while cranking.
Ok with that said, you can use the alignment marks on the throttle if you like, I prefer to just feel it. The only way I can describe it is to twist the throttle so you can tell that you've taken the slack out of the cable and just barely cracked the throttle blade open.
In the nearly 3 years and 110 hours on my wr i have never even touched the enrichment plunger even when it was 32 degrees out, in fact I've started it close to 0 F without ever doing anything but crack the gas and hit the button. I have a voyager computer and for reference if I start and hold the throttle in the same place the bike idles at about 2400 rpm ( factory spec is 2100 and I set mine to 1700)
Now just to further prove my point, my bike has the exhaust cam re-degreed to the YZ spec and I have the comp ecu
My friends bike is totally stock and they both start exactly the same way.
Rather than waste your time and money trying to adjust the c0 level which was already stated here had little affect, I recommend you buy an earth x battery which will save you 5 lbs but more importantly will give you a much more aggressive starter which also helps especially when in gear.
I am gong to prove my point 1 step further!
The group I ride with also has a husquvarna, KTM and suzuki and a newer YZ 450 which are all fuel injected!
THEY ALL HAVE PROBLEMS STARTING UNLESS YOU CRACK THE THROTTLE!!
I've watched those guys kick and kick and press the button with the same result until I suggested they try cracking the throttle!
Now each bike fires up on the first press or kick every time!
So for those of you who are having this issue for the love of God!!! Please try following this advice! It is simple, free and stated in your owners manual!
I recently almost bought a 2016 KTM 450 xc and experienced the EXACT SAME ISSUE cracked the throttle with no choke/enrichment while cold and again while hot at the dealer and had same results as I expressed above.
The only way this bike will start every time without touching the gas is if you turn up the idle to 2400 rpm which I do not recommend. But if your too lazy or simply cannot follow instructions that may be your best bet.
Another point to further support my observation.. another poster above reported the dealer had left the enrichment on and that is why the bike was starting so well..
the plunger does nothing more then allow more air into the intake. it is the exact same thing as cracking the throttle open with the exception that the TPS is being rotated slightly.
the TPS tells the ecu where the throttle position is. this information tells the ecu that a little more fuel is also needed.
the plunger is just an easier way to hold the idle at a higher setting as the bike warms up.
if you try to use enrichment when the bike is hot it will make it lean because the ecu only adds fuel when the water temp is cold.
Now go out to the garage and follow this exactly, no enrichment, in neutral, crack, hold, press bingo!
If you would like I can make you a you tube video trying to start it in ANY other configuration and it will crank, crank away with no luck, crack the gas and bingo! Every time!
i also find that the bike needs slightly less throttle when hot and sometimes it will start with no throttle when hot, but to make sure it fires i find just a slight amount just like when cold gets it to fire every single time.
If any of you don't believe me, you can pay 200.00 of my plane ticket fully refundable if I am wrong and I'll show you how to start your bike!
Thanks for the starting info, I want it for a different reason though. Don't have an issue starting mine, luckily.