Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Jet Size vs Gas Flow Rate
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="jaguar, post: 1473597, member: 19340"] I also bought a [URL='https://thumpertalk.com/link/click/1311/']Mikuni[/URL] needle jet and tested the flow rate through it with the needle at different locations in it. At "closed throttle" with the fattest part of the needle at the needle jet (allowing the most minimal space) there was still some flow. That means the needle width in relation to the jet diameter has an influence on the needed idle mixture. If the needed # of idle jet is high then the needle should be skinnier, and if the needed # of idle jet is low then the needle should be fatter or the needle jet is wallowed out (something that happens mostly with 250cc and bigger). Note the graph doesn't show a linear relationship between the flow area and the flow rate like we have with the idle and main jets. That means there are boundary layers that restrict the flow. That is to say that the zone close to the surface flows slower due to a type of friction. In the graph below the needle jet flow area is the varying area between the needle and its jet (the hole it slides in). [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Jet Size vs Gas Flow Rate
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom