All Things Moto! Dirtbike Forums  

Go Back   All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 4-Stroke Dirt Bike Bike Forums > 4-Stroke Dirt Bikes - Yamaha

Reply
 
LinkBack Thread Tools
  #1  
Old 02-23-2013, 01:53 PM
Welcome To ATM
 
Join Date: Feb 2013
Last Online: 02-23-2013 04:54 PM
Location: Maine
Posts: 1
Default Carb Issues.

Hey guys, i am currently having an issue getting my friends 2001 YZ250f to idle. It has the classic Keihin Flat CR carb but being an old thumper has 2 chokes. one for hot (lean choke) and one for cold (rich choke).

before tearing into the carb i did a compression & leakdown test and both passed very satisfactory. the issue we are having is the bike does not want to sit at an idle with out the chokes engaged. the second you disengage the chokes, it dies out.

before cleaning we noticed it had a 155 main jet and the needle set to 5th position. (standard is 175 main jet/ needle in 4th position) pilot jet is a #45 and pilot screw is 1 &3/4 turns out (referencing to the service manual).

i have swapped everything back to factory and i have currently boiled the carb body. any suggestions would be great. i have yet to put the carb back into the bike to try it out.
Reply With Quote
  #2  
Old 02-24-2013, 03:00 AM
ATM! Addict
 
Join Date: Oct 2003
Last Online: 04-14-2014 09:07 AM
Location: alaska
Posts: 10,344
Default

i guess my first suggestion is to put the carburetor back on and try it. i think you are using some sound logic to get the rig back to its original setup. set the float while you are at it, or you wont be back to factory specs yet.
Reply With Quote
Reply

  All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 4-Stroke Dirt Bike Bike Forums > 4-Stroke Dirt Bikes - Yamaha


Thread Tools


Similar Threads for: Carb Issues.
Thread Thread Starter Forum Replies Last Post
TTR 90 carb issues paulpgh 4-Stroke Dirt Bikes - Yamaha 2 06-21-2011 08:15 PM
carb issues? cosmickites 2-Stroke Dirt Bikes - Kawasaki 4 01-12-2010 02:39 PM
Carb Issues CR125Phil 2-Stroke Dirt Bikes - Honda 1 12-29-2009 09:28 PM
03 CRF 450 Carb Issues! monkeyonahill 4-Stroke Dirt Bikes - Honda 4 10-12-2009 02:45 PM
Carb issues on my 03 450? strykmaster 4-Stroke Dirt Bikes - Honda 13 02-03-2004 09:15 PM


All times are GMT -6. The time now is 08:44 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright ©2002-2020, JDub Consulting, Inc. All Right Reserved.