Uncorked the bike, now bike dies

24 replies to this topic
  • Slow and Jerky

Posted May 19, 2015 - 01:24 PM


If you do it is small increments and keep track of how much you turned it you should be okay.

  • buhlockay

Posted May 19, 2015 - 04:01 PM


Awesome thanks!!!

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  • FrontRangeRider

Posted May 21, 2015 - 06:12 AM


No, The catch tank is suppose to be filled to the fill line.

*Try and get the dealership to load the FMF map with the GYTR Tuner so you'll be good to go.

I asked the same question about the catch tank when I picked up my bike (2015 WR450F) and got the same answer.  Just checked my service manual (page 3-17) and there is no mention of coolant in the catch tank.  The SM says to check the coolant on a cold engine by removing the radiator cap. 

  • FrontRangeRider

Posted May 21, 2015 - 07:39 AM


I read the FAQs and the performance mods section for the bike but cannot find what I was searching for.  Is there a link or a thread that describes the range of options for performance upgrades for the WR450F?  Does Yamaha have a tuning guide for the bike?  I see they sell lots of parts but have not found a refernce to a tuners manual.  I have not ridden a serious dirt bike in 38 years so don't plan on any immediate changes but I would like to understand the options.


If I understand correctly, I need the competition ECU to get the YZ throttle stop screw (unless I can find the part number somewhere) and to use the GYTR tuner to change maps.  The competition ECU does not provide any performance change; it just allows the use of the tuner.  Is that correct?


Some other questions:

- If I uncork the bike, is it possible to go back to stock exhaust setup by putting the parts back in (knowing that I will have to re-adjust CO)? 

- Will I get performance improvements if I change maps without uncorking the bike?  Am thinking that I should add performance in small increments as my skills improve/ return.

  • Krannie McKranface

Posted May 21, 2015 - 11:15 AM


You have to un-cork,  and re-ecu with a re-map if you want it to run at the right temp, and not stall or overheat.

This is the way it is.


Re-mapping is not a 'performance' upgrade past the input/output flow of the motor. It's just how you correct poor A/F ratios, just like jetting.


In otherwords, you will get the A/F ratio correct, and if you vastly upgrade the head, exahust, or intake, you re-map to correct your now incorrect A/F levels.


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