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Only will run with choke half on .adjusted jets as per manual cleaned fuel line out and spark plug

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It is pretty hard to adjust the jets when the choke has to be half way on to get it to run. If you mean that you adjusted the jets to the initial start settings, then there is still some adjusting to do.

If the chainsaw's engine is running fairly well with the choke partially on, that means there is a restriction in the gas line somewhere or the jets are not adjusted properly. Try adjusting the jets a little more open (counter clockwise) to get the choke off - should be like 1/8th of a turn. Then you have to adjust the high and low idle until the engine runs smoothly with power - that will take some trial and error. I have found them to be quite finicky.

The last time I experienced the kind of problem that you are describing, I found that someone had screwed with the throttle adjustment to the point where it was completely maxed. The throttle should ride on the sloped portion of the adjustment screw near its tip. The book for the saw should give you step by step - follow them.

This is really a shot in the dark because you don't describe what the unit is and what you have done to this point. Your best bet is to read the manual for the saw and carefully follow its directions.

Posted on Mar 15, 2011

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You probably have to take the carburetor apart, clean it and put new diaphrams and gaskets in it.

Posted on Mar 15, 2011

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1 Answer

Only runs with choke on


Hi, Jeff 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. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
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Back pack leaf blower wont run past half chick


Either your carb is still dirty as in has clogged jets or passages, bad diaphragm in the carb or you have the air/fuel needles way out of adjustment. Google what type of motor you have and how to set carb. Or even get a manual, that would be my advice. Also make sure you don't have to much 2 stoke oil in your fuel mix.

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1 Answer

2000 Yamaha WR400 wont run with choke off.


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
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5. Float level too low.
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7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
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1 Answer

Husqvarna 223l runs wide open on choke, but dies when choke is off


it may be the idle jet is plugged there is a needle and seet on most of them. have you tried half choke sometimes the will clear on their own

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1 Answer

Xr400r's been stood a while, had trouble starting it, changed the plug, now starts easier but bogs on use of the throttle and only runs with the choke on half, changed the fuel cleaned the main jet but...


Make sure the carb is thoroughly cleaned, all jets not just main. The half choke is compensating for the slow circuit jet. Check your air/fuel mixture. Also, check the air and fuel filter. If all checks out fine and you still encounter the problem, could be : bad gas, wrong spark plug heat range, or most likely the diaphragm for the top of the carb.

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1 Answer

I have a model SS 30 Ryobi string trimmer with the Zama carb. As per proceedur I pump it 7 time & pull til it starts to catch in full choke. I then move it to half choke and it starts. After a warm up...


Hi nutcracker9...

Sounds like you have dirt/debris in your carburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
If you do replace your fel lines be sure to draw on a piece of paper the routing of the fuel lines for later attachment to the correct connection
Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting fire at the spark plug.
You do this by grounding the plug on the head of the engine and pulling the crank rope, if you are getting spark then:
Check/Clean/Replace your fuel filter if you have one, normally they are located in the fuel tank of weedeaters.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor.
Normally the big line will be the line the fuel filter is connected to inside of the tank.The smaller of the two lines is the return to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Also make sure you are using fresh fuel...and oil mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.
If the mower/weedeater is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
Once you have your carburetor rebuilt that should solve your problem.
This is a FREE answer,Please take time to rate me

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1 Answer

Husqvarna 142e will not stay running. Going through the sequence of full/half choke it will start and run at high rpm when choked. Even after warmed up, it will die within a few seconds after dropping the...


Hi,
If it is only running high at full choke - then it is not getting enough fuel.
You've cleaned out the whole thing - so it's not air that's the problem. It's running - so it's not a spark problem - it's a fuel problem.

If you have a fuel filter - change it out or clean it properly. If the fuel line is clear, then you need to adjust the running setting of the carb - there are usually 2 setting knobs -one for idle - one for running / mix.
You need it running richer till you get it going - then trim it back to stop it smoking and get a good rev.

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2 Answers

Sputters & quits at proper RPM for engaging trans or mowing deck


If the choke has an adjustment point, then adjust the choke to a good overall working powerband. If it still doesn't act correctly, look for vacuum leaks. If it is an option, you may want to install a manually operated choke lever.

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