Starter Jet change ???

4 replies to this topic
  • MKP

Posted May 16, 2005 - 05:22 AM


New '05 WR450F.
Problems with warm starting.
Did all the free-mods (AIS, Grey Wire, Snorkel, Baffle out, Throttle Stop)
Jetting: pj#48, mj#170, others stock, fuel screw stock.
Still a litle backfire.
Riding conditions: 0-2000 feet, 60-75 F.

- Changing the Starter Jet could solve my problem ?
- Where is the Starter Jet ?
- Can I change the Starter Jet without removing the CARB ?

Thank you in advanced.

  • Indy_WR450

Posted May 16, 2005 - 05:27 AM


Starter jet is for cold starting choke feed circuit.
Hot starting is usually set with the pilot and idle.
Try a new iridium spark plug it really makes starting easier. :)

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  • MKP

Posted May 16, 2005 - 05:48 AM


Thank you Indy.
Now I know: "Starter Jet nothing to do with warm starting" :)
I´ll try the new spark plug.
Also I´ll try the fuel screw, may be 1/2 more turn out (still have little backfire).

  • Texas4play

Posted May 16, 2005 - 06:07 AM



What about your carb needle?

  • MKP

Posted May 16, 2005 - 06:13 AM


Needle is in the stock position ¿? ('05 WR450F).

Think too complicated for me to change it, is it?
Also, haven´t tried with the fuel screw yet.
What do you think ? :)


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