'06 WR450 Hard to start after mods

6 replies to this topic
  • yz-dwg

Posted February 03, 2007 - 08:13 AM


Hi all, I did the mods, (PMB insert, GYTR AIS removal kit, snorkel, grey wire and zip-ty fuel screw) now my bike is very hard to start when cold, Ive searched and it seems I'm not alone with hard start problems. I aboslutly love this bike and its new power, I live in southern AZ at 3600' and ride between 2500'-5000' could jetting be my issue? everything is stock except the GYTR pilot jet and needle but dont know much about jetting, I checked the valves and they are within spec, bike runs and starts great when warm, any advice about jets or cold starting is appreciated.:ride:

  • Jwar1r1t3

Posted February 03, 2007 - 08:25 AM


I have found that since it has an accelerator pump on the carb, that opening the throttle 2-3 times before cranking it over helps with starting.

This should help with your jetting questions. http://www.thumperta...ad.php?t=411240

  • MountainMax

Posted February 03, 2007 - 08:57 AM


You just beat me to it Jwar1r1t3, lol twist the throttle at least twice, fairly slow and it will prime her up, with choke on she'l start right up

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  • yz-dwg

Posted February 04, 2007 - 06:41 AM


Thanks for the advice guys but I've tried that many times, I've also tried no throttle pumps and many pumps, usually after 5-10 pumps it will cough and try to fire but not start, i then pump it 2-3 times and get the same result untill finally it will stay running. I thought once that i was flooding it but holding the throttle open to clear it didnt seem to help, I ran the battery down yesterday trying to start it, when i heard the starter slowing, I kicked it and she started right up, maybe my battery or starter is weak, I think i will try to start it with kick only today and see what happens...............

  • Jwar1r1t3

Posted February 04, 2007 - 07:38 AM


I have noticed that the kick starter is much stronger than the electric. I have no idea why they wouldn't have made the starter strong enought to start it. The new 4 wheelers have electric start without a kick starter, and they are very strong and reliable.

I would try going way lean on the slow jet, that should help with your starting. I think that your hard starting IS because of the mods you did, as the ones you mentioned would end up in a rich mixture.

You said you used the GYTR lilot jet and needle, what #'s were they??? You may have used the wrong ones for your elevation.

  • clark4131

Posted February 04, 2007 - 09:49 AM


You need to rejet the carb for your elevation. Look in the Jetting Database for what you need, especially in the starter jet arena. Bump it to a 68 and I'll bet your problems go away...SC

  • MountainMax

Posted February 04, 2007 - 12:42 PM


they make the starter just enough to work to keep weight down, i know it's a pain cause i got a yz cam and it don't like the electric start either, lots of jetting and the right touch and i can get it to start though.


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