Bigger start jet. Is there a downside?

5 replies to this topic
  • AUS_WR450

Posted June 01, 2005 - 01:56 AM


Gidday to all the WR450 jetting guru's.I am thinking of going up to a #72 starter jet on my aussie 04 wr450. It now takes a few more kicks to get it started when cold, now the temperature is dropping. It used to be first kick (or push of the e/start)

Is there a downside to going too big on this jet. I am aware that it controls the choke circuit only, but was wondering what would be the symptoms of it being too rich.

FYI, I run a full FMF exhaust system, 170MJ, 48PJ, #40leak jet and F/S 2 & 3/4 turns out.


  • 450high

Posted June 01, 2005 - 02:26 AM


No down side , just easier starting when cold.I was only able to get a 70 as i was told yamaha australia didn't bring a 72 in ?

  • AUS_WR450

Posted June 01, 2005 - 03:38 AM


Thanks for the info, fellow aussie :)

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • JeffWR

Posted June 01, 2005 - 04:54 AM


Anybody know what the stock starter jet is on an '05 WR450 is?
Thanks for the info, Jeff

  • pappabob

Posted June 01, 2005 - 07:52 AM


the stock starter jet is a # 65

  • pappabob

Posted June 01, 2005 - 08:01 AM


the stock starter jet fore the 05 yz is a # 72


Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.