New Owner

7 replies to this topic

Posted December 30, 2006 - 01:23 AM


Hey guys and gals, heard about this site from several folks/I was the reciepiant of a 04 YZ450F w/less than 30 hrs!!!!! I have a lot of backfiring on deceleration..Any ideas,any help appreciated, also can anyone suggest a good stiff spring for a heavy rider?

  • georgedoggy

Posted December 30, 2006 - 01:46 AM


check the sticky section of this forum, im sure there is a section on backfiring on 450's and how to fix it. im pretty sure its because your bike
is running lean.

as for the spring, im 250 pounds and i ordered the stiffest spring i could get! ask around and find out what guys your weight are using, it might be trial and error as ifound. i have gone thru 3 rear springs to find the right one.

  • BergArabia

Posted December 30, 2006 - 02:07 AM


yeah do like George says.
I think a little backfiring on decel is pretty normal.
If it is excessive you may be a little lean on the main jet.
Oh BTW the header will glo but it is supposed to do that.
don't leave the bike idling too long.
Enjoy. You have a great bike...:lol:


Posted December 30, 2006 - 02:26 AM


It Has A M4 Exhaust And Does It Glow, Man That Bugar Gets Hot.. Thasnks For The Input

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Posted December 30, 2006 - 02:27 AM


Thanks For The Input

  • capfo

Posted December 30, 2006 - 08:24 AM


What part of TX are you in?

  • Bigcr

Posted December 30, 2006 - 09:27 AM


If it's really popping a lot, check the pipe itself and make sure there are no leaks at the head or where the head-pipe meets the silencer. As far as springs go, check or and use their spring rate calculators. Be sure to get the matching front springs as well.

  • red7

Posted December 30, 2006 - 11:09 PM


Congrats on the new bike! Start by going up a main jet size and see how that effects things.

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