2005 400ex jetting - ATV Forum - All Terrain Vehicle discussion for Honda, Yamaha and more ATVs
 
LinkBack Thread Tools
post #1 of 2 (permalink) Old 09-13-2018, 02:31 AM Thread Starter
Junior Member
 
Join Date: Sep 2018
Posts: 1
 
2005 400ex jetting

I have a 400ex thats been rebuilt to a 426. I just ordered a hmf slip on a k&n filter. Anyone know jetting if riding at 500 ft above sea level?
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 04-21-2019, 03:14 PM
Junior Member
 
Join Date: Apr 2019
Location: Ohio
Posts: 11
 
Jetting is a very individual thing for each engine. With the increase in displacement, slip on and filter, I would order a set of three main jets larger than stock, and try the middle one first. In other words, two sizes above stock. Same with the idle jet. But be very mindful of overheating. A lean engine will run very hot very quickly. Better to be too rich than too lean, if even for 1/2 hour. Test run it in the dark, and if the exhaust pipe glows, you are too lean. This will burn up an engine very quickly.
Woodsruner is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the ATV Forum - All Terrain Vehicle discussion for Honda, Yamaha and more ATVs forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome