09 YZ450F A little mild for my liking


29 replies to this topic
  • GasGas17

Posted August 09, 2010 - 04:19 PM

#1

I just bought a brand new 09 450 and find that it is laking in the power department. It definitely does not have the snap that my 03 Gas Gas 450 with FI did. Are there any cheap/free mods to uncork this thing? I don't really want to spend a bunch of money on a crappy aftermarket, noise belching pipe. Do I need to remove the back fire screen or any other factory install stuff?

  • grayracer513

Posted August 09, 2010 - 04:44 PM

#2

Ditch the shorty muffler and pick up a used CDI from an '06.

  • crf450319

Posted August 09, 2010 - 05:26 PM

#3

I felt the exact same way with my new '09 that I bought this Spring. Here's what I did :

'06 CDI on E-bay $40
'06 Standard carb needle jet
170 main jet
New FMF Powerbomb header on E-bay $64
New Procircuit slip-on E-bay $175

The biggest culprit that robs power is that garbage stock exhaust, check these posts out for info on removing the cone(s) out of the stock exhaust :

http://www.thumperta...4&highlight=pmb

http://www.thumperta...ad.php?t=851003

A cutaway view of the stock exhaust :
http://www.motocross...F3E7ECC2A3CD20C

My bike has a night and day different feel in comparison to when it was stock, I've also put heavier DSP springs in the forks and shock ($149.99 shipped to your door). It's awesome !

  • grayracer513

Posted August 09, 2010 - 05:33 PM

#4

My bike has a night and day different feel in comparison to when it was stock, ...

Throw an '06 CDI on it and you'll think there was a third option.

  • crf450319

Posted August 09, 2010 - 05:48 PM

#5

I felt the exact same way with my new '09 that I bought this Spring. Here's what I did :

'06 CDI on E-bay $40
'06 Standard carb needle jet
170 main jet
New FMF Powerbomb header on E-bay $64
New Procircuit slip-on E-bay $175


I put an '06 CDI on it before the hour meter had hit 2 hours.

  • grayracer513

Posted August 09, 2010 - 07:09 PM

#6

Missed that. :banana:

  • cjxrider125

Posted August 11, 2010 - 10:16 PM

#7

what difference does the 06 CDI make?

  • usp4u

Posted August 12, 2010 - 07:48 AM

#8

does the '06 CDI trick also work for the '08 ?

  • grayracer513

Posted August 12, 2010 - 10:12 AM

#9

does the '06 CDI trick also work for the '08 ?

Yes.

what difference does the 06 CDI make?

The '06 uses a different timing map that provides more lower mid range through upper mid range power. Those who have tried it say it's pretty remarkable.

  • AndyM1022

Posted August 13, 2010 - 06:01 PM

#10

Yes.

The '06 uses a different timing map that provides more lower mid range through upper mid range power. Those who have tried it say it's pretty remarkable.


How well does it work with the stock exhaust?

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  • grayracer513

Posted August 13, 2010 - 07:22 PM

#11

I don't know that anyone's tried that, but you might hear from somebody. My guess is that it will be better, but the stock exhaust is a pile no matter how you look at it.

  • 03rkjc

Posted August 17, 2010 - 03:33 PM

#12

So you are talking about just a stock 06 CDI? Wow I may give that a try.

  • cudenver

Posted August 17, 2010 - 08:54 PM

#13

I felt the exact same way with my new '09 that I bought this Spring. Here's what I did :

'06 CDI on E-bay $40
'06 Standard carb needle jet
170 main jet
New FMF Powerbomb header on E-bay $64
New Procircuit slip-on E-bay $175

The biggest culprit that robs power is that garbage stock exhaust, check these posts out for info on removing the cone(s) out of the stock exhaust :

http://www.thumperta...4&highlight=pmb

http://www.thumperta...ad.php?t=851003

A cutaway view of the stock exhaust :
http://www.motocross...F3E7ECC2A3CD20C

My bike has a night and day different feel in comparison to when it was stock, I've also put heavier DSP springs in the forks and shock ($149.99 shipped to your door). It's awesome !


where do u find a fmf powerbomb header for 60 bucks, all of them are 170

  • scottwvu

Posted August 18, 2010 - 04:44 PM

#14

Will the '06 CDI box help out on an '07 YZ?

  • grayracer513

Posted August 18, 2010 - 07:08 PM

#15

More low end, a little less top.

  • ectm3

Posted August 19, 2010 - 02:47 PM

#16

Another cheap fix is to switch to a 50 tooth sprocket.

  • GasGas17

Posted August 20, 2010 - 03:11 AM

#17

A twin air filter actually made a difference. I will order the 50 tooth sprocket. I really doesn't need much more for my liking. Just a tad on acceleration.

  • crf450319

Posted August 20, 2010 - 06:44 AM

#18

where do u find a fmf powerbomb header for 60 bucks, all of them are 170


I won it on an auction, I was willing to pay more than double what I actually did. That was one of my better finds on Flea-bay so far this Summer.

  • PAdaytonaman

Posted September 03, 2010 - 03:24 PM

#19

I just put in the 06 cdi and not that much of a difference. Already have DRD exhaust and yz250 filter cage with 165 main. I might try the 06 carb needle and a 170 main.

  • husky390or

Posted September 03, 2010 - 08:03 PM

#20

How well does it work with the stock exhaust?


I was riding in higher elevation after I put the 06 CDI on mine with stock exhaust but I did notice more snap on the bottom end.
I just installed an FMF Q4 on my bike and will let you know how it runs after this weekend. I may need to re-jet (I'm now riding around 7,500') but I'll let you know how it did. Funny thing is, at idle, the Q4 seems louder than the stock silencer.





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