Question about 2004 Honda CRF 150 F

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2004 Honda CRF 150 F won't stay running

I have adjusted the valves cleaned and re-gaped the plugs cleaned air filter cleaned spark arrestor tried to adjust carb but nothing seems to work@

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  • Honda Master
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Hi, Smiley1961 and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
13. Multi carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
more help with the 150r please won stay running
Brand new CRF150 won stay running
CRF150F service manual repair 2003 2013 CRF150 Download Manuals Technical $15
https://www.partsfish.com/page/oem-parts-for-honda
Honda 2004 CRF150F Owner Manual

Posted on Oct 30, 2017

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Posted on Jan 02, 2017

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SOURCE: Cleaning Carb Jets

not to a trained ear also go by rpm and spark plug color

NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate

better use a manometer for adjusting screws

depends on condition of org parts

worn = richer running

new = lean an clean

also if changed the exhaust system need to
re-calibrate carbs for max performance

Posted on May 09, 2009

  • 3567 Answers

SOURCE: need some base carb adjustments for the 2004

The idle screw and the air screw on the outside throat of the carb must go back in the same locations they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. If they are tightened as a normal screw would be, they are ruined.

I don't get paid for my answers. I am only trying to help. I do take pride in them. So if you will, > > > > A “very helpful” rating for these answers? Thanks!

Posted on Jun 12, 2009

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1 Answer

MY Stihl BR-550 Has a rebuilt Carb, Clean spark arrestor, New spark plug, fresh 50:1, valve adjustment, filter, new pull cord assembly. The issue...it binds then smooth when pulling, cant get any rpms


Suggest you try:
1) Flywheel key could be sheared. It is located under the starter drive cup/armature coil magnets just beneath the recoil assembly.
2) starter drive cup rubbing on ignition coil
3) ignition coil failed due to rubbing causing heat failure
4) valve adjustment .002" clearance
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I have a Muccullach FR56" just bought used and it was not running so i cleaned the carb and made sure the primer was working correctly put it all back together and tried it still nothing


Try this - check then clean or replace:
  • Fuel Filter - Located INSIDE the gas tank
  • Spark plug
  • Spark Arrestor - Screen at muffler. When clogged with carbon build up, exhaust flow is extremely restricted, causing problems.
  • Carburetor- may need a new rebuild kit
Also, watch this...

And this one...

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When weed eater is running in order to get the head to turn i've got to give it full throttle before i can cut the grass, and it still bogs down.


do you have two adjustment screws down in a hole in the carb?
If you do they are the carb. high and low adjustment.
What I do is take a hacksaw and cut a groove right in the housing an the screw heads .that way you can adjust them Good luck

Feb 07, 2015 | Troy Garden

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Ryobi weed eater stalls when giving it gas


check air filter and spark plug if good carb adjustment is needed or carb may be loose. could be bad fuel water in gas will cause this

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1 Answer

Starts but coughs out and stalls when I try to cut


It could well be a carb adjustment issue, however before doing any adjustments you need to make sure the air filter is clean, the fuel filter in the tank has been changed, and if there is a spark arrestor in the muffler outlet it is nopt carboned up.

Jul 08, 2012 | Garden

1 Answer

Chainsaw only runs when i take off the air filter and keep it at high revs,as soon as i take finger of the trigger it cuts out and wont idle.ive already cleaned out the carb,checked fuel,cleaned filter and...


It sounds rich to me try turning the "L" needle CW a little. CAUTION CW is leaner, to lean will destroy your saw. Adding the air cleaner leans out the mixture. Adjusting it with the air filter off can cause a run lean condition when installed.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
  • CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
  • Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
  • Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
  • There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
If you have more questions or need additional help please reply below and I will get back to you. Good Luck. HTH
Lou
Thank You for using FixYa.

Apr 24, 2010 | McCulloch Garden

1 Answer

The chainsaw boggs down immediately when it contacts the wood. It runs somewhat choppy as well at idle. It is new to me and this is the first time I ran the saw. Is this a carb adjustment thing? plugged...


Clean the air filter. Remove, clean, and reinstall the muffler and spark arrestor.

If my new saw I would consider a Stihl mechanic tune up $40±. New plug, new fuel filter, pressure/vacuum tests and carburetor adjustment.

Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
  • CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
  • Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
  • Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
  • There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Mar 22, 2010 | Husqvarna Chain Saw 20" Bar

1 Answer

142 chain saw. Starts but will not pick up when


Remove, clean and reinstall the muffler and spark arrestor, if no better the "L" needle may need adjustment.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
  • CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
  • Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
  • Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
  • There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
Most chainsaws die because they are are run lean. I am going to inject a little Lou theory here. Air leaks and defective fuel delivery systems account for most chainsaw failures. Constant adjustment of needle valves can easily camouflage more serious problems that result in burning up your saw.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Mar 21, 2010 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

Yard machine ym26ss straight shaft trimmer. New gas,


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

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1 Answer

Husqvarana Rancher 55 , how to clean the exhaust port


Cleaning the exhaust: on the saws I've worked with it was just to loosen two bolts at the front and then the exhaust is off the saw. Clean with brake cleaning fluid and blow with compressed air, let it dry before assembling. Don't forget to clean the fine mesh at the output side underneath the lid if present (i.e the spark arrestor).

Make sure to have your carb adjusted properly afterwards.

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