Can someone explain this?

2 replies to this topic
  • snmhanson

Posted February 01, 2005 - 03:00 PM


I'm not sure if this post should be here or in the jetting section - feel free to move it if it is in the wrong place. I was hoping someone could explain to me what each jet does and how they all interact with the fuel screw and needle on my 05' WR450. I have changed the pilot, main and starter and needle as recommended here and with my JD kit and switched out to a Zip-Ty fuel screw but haven't messed with the other jets. My basic understanding is that the pilot controls idle and low RPMs while the main controls the upper RPMs. The needle I would guess interacts with the main since it goes into the main needle jet. I'm not exactly sure where the fuel screw comes in. I know it adjusts the fuel/air mixture but is it for fine adjustments after the jets and needle and does it effect all levels of RPMs or only a certain area? And what about the leak jet and pilot air jet? Are those something that I realistically need to worry about? Also, is the starter jet actually just for starting the bike or does it have a another or different purpose altogether? I have a vague understanding jetting and I kind of understand the principle of it but I think if someone could explain more clearly it would really help me, and maybe others, with their jetting. Or, if there is somewhere else I could find out how it all works together just point me in the right direction. Thanks.


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  • Dan_Lorenze

Posted February 01, 2005 - 04:09 PM


Wherever is fine with me but You'll probably get more answers in the jetting forum. I'm sure there's a sticky or some type of link to one of James' threads there. :cry: I'm not the jetting expert or a great typist, otherwise I would love to spend the time with you... :cry:

  • Indy_WR450

Posted February 01, 2005 - 06:03 PM


starter jet is just for the choke circuit! :cry:


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