Question about 2004 Honda CRF 100 F

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I have a 2004 crf 100 carburetor,im having problems with the bottom needle valve,when i adjust it out its loose it wont hold adjustment,when i first took it apart i thought something crumbled in my hand,i ordered a new needle valve kit,but when i put it in it doesnt help,and it doesnt feel right,like its not botoming out correctly and its still not tight,i borrowed a carburetor off my brother and his isn't like this,please help.

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  • Honda Master
  • 16,373 Answers

They are not expensive to buy and it could be that someone tightened it too tight. When that happens the seat wont move and the threads on the body can strip. Time for a new one. Never tighten the needle valve all the way down with a tool unless you are very careful.

Posted on Jul 08, 2017


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Posted on Jan 02, 2017

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SOURCE: Crf 450 front preload adjustment

Hi ...... Any preload and/or damping will be adjustable from the top of the forks (even upside down forks). Anti-clockwise to reduce, clockwise to increase. You may find that a previous owner has increased the 'weight' of fork oil as a cheap/easy alternative to adjustment or aftermarket linear or progressive springs.

Posted on Dec 29, 2008

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SOURCE: crf 250 not running correctly

Dear Wivs 1 hi I am vortash I am thinking this just might be your battery or your magneto , the bike is firing but has not got enough power to sustain it . Most bikes run off the mag once they have started so it should also run off the battery for a while , if the mag was down provided the battery was charged .So sounds like the magneto hasn't charged it , most modern mags have a detachable rectifier or is attached to a rectifier somewhere on the bike . Check the output if you have a multimeter ,if you have a 6volt system it should be producing approx 8-9volts DC , a 12 volt system should produce between 13.5 14.5 dc voltage . I am sure this bike was produced with both depending what market ie USA . Europe , etc
hopefully this will show you if you have a problem there .. However another symptom similar to what you have described is due to a cracked Cylinder sleeve , as it attains an explosives compresion the power is lost from the cylinder hence the bike stops .. you can test this simply by holding a sharp pin on the cylinder face roughly half way down and tracing around the cylinder if the pin finds a crack it will stop abruptly ... indicating it's posistion .
I have disscounted the obvious ie: fuel as you say that you have thouroghuly checked out the fuel system and providing this bike has not been modified in some way I think you have covered most of the area I would . hope this is of help Regards Vortash

Posted on May 14, 2009

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SOURCE: 2004 honda crf 230 f

i could write a long thing on here but you should just go here it will tell you every thing

Posted on Jun 06, 2009

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SOURCE: Valve Adjustment for 2003 Honda CRF 450 R

This should help.
Please rate this answer, thanks.

Posted on Jul 25, 2009

  • 1 Answer

SOURCE: 04 crf 250r.... the head has a chattering noise when running

set your cam chain tension

Posted on Aug 12, 2009

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How do you adjust idle speed 1991 johnson 100 hp

not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

(Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
(J. Reeves)

The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

(Carburetor Adjustment - 2 Slow Speed Adjustable Needle Valves, each carburetor)

Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

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How to I set the car carborator on my chainsaw craftsman 358.350080

I must assume you have already disassembled the carburetor and cleaned it and installed a carburetor repair kit. If you have not then it will likely be necessary before adjusting the high speed, low speed needle valves and the idle speed screw. Generally speaking you will need to close both high and low speed needle valves by turning them both clockwise until you feel them bottoming out after cleaning and installing a carburetor repair kit. _NOTE: Do not apply a lot of torque when they bottom out or you could cause damage to the needle valves or seat. From the closed position start by opening/turning the needle valve counterclockwise (CCW) 1 and 1/4 turns open. Turning the needle valve in the counterclockwise (CCW) direction richens the fuel mixture and CW will make it leaner. Once it starts and warms up you will likely need to fine tune it by holding the throttle wide open and adjust the (H) high speed needle valve/jet until the engine it runs smooth.
If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations: Sears Home Services .

Jul 13, 2013 | Computers & Internet

1 Answer

2004 CRF 100 cam chain tension

Hi, Anonymous for this scenario you will need your service manual, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere $15 you can download another one.
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2005 Honda CRF 100 choke not working

Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
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2007 Honda CRF 100 F valve adjustment

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1 Answer

2004 Honda CRF 150 F won't stay running

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.
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2 Answers

How to adjust the idle nob on a 2002 crf 450r. the problem is it is letting in too much fuel causing it to pour out of the overflow. and i need to know the factory setting for the idle adjuster nob

The reason your carburetor overflows is not from an incorrect adjustment, but because the float valve is hung open by dirt or some other foreign debris. Turn the petcock off, then locate the drain screw on the bottom of the bowl and drain the fuel out. Then turn the petcock on again - and check for overflowing. If the overflow continues, the you will need to remove the float bowl, the float and float valve - clean each and reinstall to fix the problem.

Apr 11, 2010 | 2005 Honda CRF 450 R

1 Answer

Float adjustment wont idle

the floats dont often go out of adjustment, as the float needle has a rubber tip that doesent wear,
If the carb doesnt drip fuel, the level is probably ok
first try air cleaner, spark plug, dirt in idle jet or carb, tight valve clearances.

Apr 11, 2010 | 2004 Honda CRF 150 F

1 Answer

Need setting for carb. adjuster on bottom of carb right at edge of float bowl. Float bowl has indentation to go around this fuel needle adjuster.

Turn the adjusting screw all the way in until it LIGHTLY seats. Now back it out one and one half turns. Do the same adjustment for the throttle screw on the right side of the carb. You are now back to the stock factory settings.

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Sep 19, 2009 | 2004 Honda CRF 100 F

2 Answers

Petrol getting into my engine oil crf 450 2007

your carb float valve is not adjusted correctly you have to take the bottom off carb and where the needle valve is the tab that holds it in needs to be bent toward the needle a touch careful not to go to far or it will not allow gas in just a toch

Jun 22, 2009 | 2002 Honda CRF 450 R

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