FMF Factory4


2 replies to this topic
  • silveradoss

Posted April 12, 2004 - 11:02 AM

#1

Anyone running a fmf factory4 silencer on your yz 450? If so hows the power compared to stock and did you have to rejet?

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

Posted April 12, 2004 - 11:19 AM

#2

In my experience with the FMF pipes I got more of a gain out of the header than the muffler. I bent my stocker and put the PB on as a replacement. Nice gain. I put the muffler on to match later with very little gain. Get the header first.

  • azridr

Posted April 12, 2004 - 12:41 PM

#3

I've got the full Factory 4 system on my '04, and I would definately say that the power is increased throughout the powerband, but to me the most significant difference is from the mid through the top. I am able to pull gears much longer, without shifting as much. Of course, since I have the header, it is impossible to tell where the biggest change was gained, but I'm sure the muffler/midpipe play a big part. By the way, a jet kit was included, but I am trying to see how close I can leave it to stock, so I am still playing with the fuel screw. I'd be interested in hearing what others are running for jetting with this pipe.





Related Content

Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
 
x

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.