dbw - dirtbikeworld.net Members Forums

Go Back   dbw - dirtbikeworld.net Members Forums > Manufacturers > KTM Forum

KTM Forum If it's Orange it's in here. Proudly sponsored by www.mainjet.com.au

Reply
 
Thread Tools Display Modes
  #51  
Old 1 Week Ago
bowser bowser is offline
dbw Pro Legend
 
Join Date: Oct 2009
Location: Mudgee, NSW
Posts: 1,415
Next time you have time, remove the MJ totally and try it. Think of the graphs that get around and what MAIN area the MJ influences. It is a really good way of separating the circuits for easier tuning.
Reply With Quote
  #52  
Old 1 Week Ago
bowser bowser is offline
dbw Pro Legend
 
Join Date: Oct 2009
Location: Mudgee, NSW
Posts: 1,415
Taken from http://www.shiny-red.net/guides/keih...retor-jetting/


"Step 1: DETERMINE THE CORRECT NEEDLE AND OR NEEDLE JET.
This is the most important step in jetting your carburetor!
Remove the main jet.
Place needle clip in mid-position.
Start engine and run it on the stand.
Condition: engine running and main jet out. Needle or needle jet is correct: Carburetor should run clean to approximately throttle. From throttle to full throttle, the engine should start to break up as a result of too rich condition.
Correction: None needed.

Condition: Needle or needle jet is too rich. Carburetor runs clean to approximately throttle but breaks up before throttle as a result of too rich condition.
Correction: replace needle with next leaner diameter and test again.

Condition: Needle or needle jet is too lean: Carburetor runs clean beyond throttle and has an erratic throttle response.
Correction: replace needle with next richer diameter and test again.
The emphasis here is to find the correct needle or needle jet diameter, which will allow more fuel to pass than is needed but not so much that the needle itself has no control below throttle."
Reply With Quote
  #53  
Old 6 Days Ago
devans's Avatar
devans devans is offline
dbw Pro Legend
 
Join Date: Apr 2013
Location: Brisbane
Posts: 1,219
Quote:
Originally Posted by Pete40 View Post
Sorry to the OP for taking the thread off topic but this STIC thing is worth talking about. My TSP-worked 250 goes really well, but you're always chasing more! It would be good to have a chat with Dave about it but he's pretty hard to talk to due to his work load. And he probably doesn't want to muck around with somebody else's mod anyway. Or maybe he does. If anybody here knows him well, ask him about it next time you have a yarn.

Pete, do you think a 300 would have been a better choice then?
__________________
2015 Sherco 300SEF-R Factory
Past: '73 Kawasaki KV75, '86 Suzuki RH250, '96 Husqvarna WR250, '76 Honda CR125 (Vintage MX), '11 Suzuki DR-Z70, '00 Kawasaki KDX200, 2015 Kawasaki KLX110.
Reply With Quote
  #54  
Old 6 Days Ago
Jakobi's Avatar
Jakobi Jakobi is offline
dbw Pro Addict
 
Join Date: Jul 2008
Posts: 7,174
Quote:
Originally Posted by bowser View Post
Taken from http://www.shiny-red.net/guides/keih...retor-jetting/


"Step 1: DETERMINE THE CORRECT NEEDLE AND OR NEEDLE JET.
This is the most important step in jetting your carburetor!
Remove the main jet.
Place needle clip in mid-position.
Start engine and run it on the stand.
Condition: engine running and main jet out. Needle or needle jet is correct: Carburetor should run clean to approximately throttle. From throttle to full throttle, the engine should start to break up as a result of too rich condition.
Correction: None needed.

Condition: Needle or needle jet is too rich. Carburetor runs clean to approximately throttle but breaks up before throttle as a result of too rich condition.
Correction: replace needle with next leaner diameter and test again.

Condition: Needle or needle jet is too lean: Carburetor runs clean beyond throttle and has an erratic throttle response.
Correction: replace needle with next richer diameter and test again.
The emphasis here is to find the correct needle or needle jet diameter, which will allow more fuel to pass than is needed but not so much that the needle itself has no control below throttle."
Yeah nah yeah! On normal PWK

The main jet still restricts flow into the needle jet (nozzle).
The nozzle/needle interface gives your part throttle.
The pilot and AS are are separate circuit.

The main certainly still influences the entire range.. just more noticable as the needle is lifted higher.. By modifying the point of the needle you would be totally separating the main and needle. I've tried running without a main at some stage. Found bike very rich across the board.
Reply With Quote
  #55  
Old 6 Days Ago
Pete40's Avatar
Pete40 Pete40 is offline
dbw Pro Hero
 
Join Date: May 2002
Location: Boggo Rd. Jail
Posts: 12,596
Quote:
Originally Posted by devans View Post
Pete, do you think a 300 would have been a better choice then?
No way. That's not the "more" I'm looking for. I hate the way 300's feel.
Reply With Quote
  #56  
Old 1 Day Ago
Juddo Juddo is offline
dbw Pro
 
Join Date: Mar 2014
Posts: 11
Tsp mod head and re flash ecu works a treat on 19 300 tpi
Just saying I wanted more bottom end
Works great
Thanks Dave
Reply With Quote
  #57  
Old 20 Hours Ago
bowser bowser is offline
dbw Pro Legend
 
Join Date: Oct 2009
Location: Mudgee, NSW
Posts: 1,415
What compression head did you go for?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2 Stroke Performance icebergstu General Bike Related Discussion 9 29-07-2018 12:22 AM
TM 4 stroke performance. racin' TM, Ossa, Aprilia, BMW, Maico & more 6 09-04-2015 11:35 PM
Power wing performance... Ktm520 KTM Forum 1 24-09-2008 11:31 PM
New performance mod..... the POWER BOWL ? disco General Bike Related Discussion 21 30-07-2007 11:01 PM
4-Stroke PERFORMANCE UPGRADE Mitch General Bike Related Discussion 4 16-01-2004 06:06 PM


All times are GMT +11. The time now is 04:50 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.