All Things Moto! Dirtbike Forums

Go Back   All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 2-Stroke Dirt Bike Forums > 2-Stroke Dirt Bikes - Honda

Reply
 
LinkBack Thread Tools
  #1  
Old 01-28-2010, 08:35 PM
Luckyduck272's Avatar
Still Crashing
 
Join Date: Jan 2010
Last Online: 10-07-2014 04:22 AM
Location: Ohio
Posts: 51
Default 2003 cr125 running rich at 1/2 to full throttle

     

I pulled the carb and found a 440 main jet. Was thinking of going to a 410. Would that be too far? Starts and idles fine and runs good at low end. Just got the bike and rode it for the first time. Air filter is clean. Spark plug is a bit gray. bike is spitting some oil out of exhaust
Reply With Quote
  #2  
Old 01-28-2010, 08:55 PM
MXtras's Avatar
Manufacturer Dude
 
Join Date: Jun 2006
Last Online: 09-23-2014 02:14 PM
Location: Virginia
Posts: 2,305
Default

Well - if it's grey, you are close but you need to go UP on the jet size, not down. A 410 is smaller and a grey plug is maybe a tad lean, not rich, so you would want to go to maybe a 450 or 460 main. A rich setting will create a black plug. A grey plug is not necessarilly a bad thing depending on how light it is but if you want engine life, you should target dark tan to light black. It also kind of depends on your plug read procedure as well as whether you are running a B8 plug or a B9 plug. B8 is a hotter plug and will read a tad leaner than the B9.

I would not be too terribly concerned about the spooge coming from the silencer quite yet. You might simply be running the bike harder than the previous owner.

Do you have any idea what mix ratio is in the tank? If it's 50:1, I'd go at least 2 steps. If it's 32:1, you could go a step at a time fairly safely. Being a 125, I strongly suggest running more oil (26:1 - 30:1) to help the ring survive.

Welcome to the site!

Scott
Reply With Quote
Reply

  All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 2-Stroke Dirt Bike Forums > 2-Stroke Dirt Bikes - Honda


Thread Tools


Similar Threads for: 2003 cr125 running rich at 1/2 to full throttle
Thread Thread Starter Forum Replies Last Post
Running rich.. Shoei_391 General Discussion 8 05-17-2007 08:59 PM
Running RIch Dirtmanabe 2-Stroke Dirt Bikes - Yamaha 10 10-28-2004 07:16 AM
Running to Rich? Bryce 2-Stroke Dirt Bikes - Honda 14 03-12-2004 03:06 PM
Running rich? Jason 4-Stroke Dirt Bikes - Honda 18 10-22-2003 08:50 AM
running rich VET393 4-Stroke Dirt Bike Bike Forums 8 10-06-2003 05:42 AM


All times are GMT -6. The time now is 07:55 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright ©2002-2019, JDub Consulting, Inc. All Right Reserved.