Jetting w/ Lexx end cap and Twin Air filter


1 reply to this topic
  • ttr250dude

Posted February 09, 2011 - 08:48 PM

#1

I've got an '08 450f with a Lexx end cap and a Twin Air air filter. In the end cap, I'm using the larger bore outlet and no spark arrester or silencer. The Twin Air air filters are slightly smaller than stock to allow more dead space in the air box.
I was thinking a 50 pilot, 170 main, and 2 1/2 turns out on the fuel screw. I like to run my machines a little rich. I'm at 700' elevation and 70-95 degrees. Any input is greatly appreciated.

Thanks, bill804

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted February 09, 2011 - 10:46 PM

#2

I was thinking a 50 pilot, 170 main, and 2 1/2 turns out on the fuel screw. I like to run my machines a little rich. I'm at 700' elevation and 70-95 degrees. Any input is greatly appreciated.

Uh, yeah.

Your pilot should be either a #45 or 48 at the most. You might possibly need the 170 main, but I would bet that a 168 will be closer. Running "a little rich" (or a lot) is not good for an engine. In fact, it washes oil off the rings, contaminates the oil, fouls plugs, and adds to the carbon on th episton and valves.

Read the posts in the fuel system section of Common Threads and browse the '08 jetting sticky.





Related Content

Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017
Forums
Photo

YZ450FX OR YZ450F by MESSMAKER


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo
Supercross

Wilson the Blue Privateer by jetfuel


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
 
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.