06 CRF 250 carb

MXSparx

Mr. Meltsomeglass

Jul 25, 1999

3,723

71

NoVa

• Nov 1, 2010

• #1

Took the carb apart because someone left the fuel on and gummed up the carb. Cleaned everything and replaced the pilot jet. Starts 1st kick with choke on. Once warmed up and off the choke it doesn't want to idle. Opening and closing throttle gives you popping and blue flames out the exhaust. Any ideas where to start??

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Nov 1, 2010

• #2

Check, clean and adjust the ap circuit and especially the ap squirt when it clears the slide. There is a leak jet in the bowl to deal with also. Now if you want the flames, thats another story? Vintage Bob

 

Rich Rohrich

Moderator / BioHazard

LIFETIME SPONSOR

Jul 27, 1999

22,839

16,904

Chicago

• Nov 1, 2010

• #3

John - If you can get it to idle better when hot by pulling the choke up a bit I'd start looking for air leaks. Take a close look at the o-ring at the base of the pilot fuel mixture screw, check the hot start isn't hanging open, and blow a little propane from a hand held torch near the intake manifold to see if it changes the idle behavior.

 

MXSparx

Mr. Meltsomeglass

Jul 25, 1999

3,723

71

NoVa

• Nov 1, 2010

• Thread starter
• #4

Thanks guys. I found that I forgot to tighten the bolt that connects the header pipe to the back half of the exhaust when I put the sub frame back on. That seemed to get rid of the flames and some popping. Does that even make sense?

 

whenfoxforks-ruled

Old MX Racer

~SPONSOR~

Oct 19, 2006

8,129

2

Merrillville,Indiana

• Nov 1, 2010

• #5

You bet it will!

 

Rich Rohrich

Moderator / BioHazard

LIFETIME SPONSOR

Jul 27, 1999

22,839

16,904

Chicago

• Nov 1, 2010

• #6

Makes perfect sense. Pulling cool oxygen rich air into the exhaust stream can reignite any remaining unburned hydrocarbons and make some cool flames.