Question about Craftsman 25cc Gas Line Trimmer

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Hard to start.floods.spark plug coated in gas.there are 2 screw adjusters on the side that needd to be reset.What are the specs for setting these?

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For the time being, leave the Hi and Lo speed jets alone. Take a look at the Zama carburetor website's TECH GUIDE where you will find troubleshooting info on your carb. It has both mechanical and carburetor induced flooding causes listed. Go to:
http://www.zamacarb.com/tips.html
This is a PDF file so Adobe reader is necessary to view it.

Posted on Aug 20, 2010

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Mitm power washer won!t start


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2006 liberty cranks but wont start


gas engine, not diesel.
its probably flooding, ever give it a 60k mile tune up, ever?
we check spark tips for flooding and dry,never do we guess at fuel pumps, ever. (pressure gauge is $20)
tips dry or soaking wet.
we check for spark , no gas engine car runs with no spark
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if spark is good and flooding (new spark plugs) we use
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skip the silly ad.
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My 1974 honda cb 200t keeps flooding. is it a carburetor adjustment. it has two screws to adjust on the carburetor. i fooled with both because it was idling very high. now it wont even start. my spark...


You have disturbed the settings of the fuel air mixture and so there is flooding in the cylinder. Now it is possible that the air screw and the idling screw was turned.
remove plug and pump out all the excess flooding by kick starter. Once all the fuelis dispelled turn the screw fully into and then unscrew about one and half times. This must be done for the air screw . The idling screw can be kept about one turn out.
Now start the engine and use the throttle screw to put the engine idle higher than idling speed. now turn the air screw to give a stable point --it will be around this settings.
once done correct the idling and set to correct ticking of the engine. make sure that the timing is correct, the plug gaps are set right.

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1 Answer

Hard to start, when i get it started it fine shut it off try to start it hard to start


Hi
General advice aplicable for all gas powered chain saws;
Clean air filter regularly.
-Adjust spark plug gap (very important). A faulty gap will either cause poor spark or a overloaded and damaged spark plug coil.
-Use correct good quality spark plug
-Use correct oil/fuel mix ratio and correct oil.
-Do not use old premixed fuel if you can avoid it.

Carburator adjustment;
-idle speed setting screw should be set so that the saw idles well, without engaging the chain. If you normally have to press the gas lever to be able to start it coul indicate a to low seting. Clockwise will increase idle speed. This screw is found near the carburator and is slightly larger the the two adjusment screws.
- fuel-air mixture screws can be set to standard factory setting as a start. Normally there are 2 screws labeled L and H, for Hi and Low rpm band adjustments. Factory setting are usually 3/4 turn out(anti clockwise) from fully closed setting for both (clockwise to closed position).
Experiment with adjustments by 1/8 increments at the time. Anti clockwise turning will increase fuel to air ratio and opposite. Warm weather will require a slightly leaner mix and cold weather will reqire a slightly richer mix(more fuel). Low rpm setting only serves the idling performance. The Hi rpm setting can be evaluated by removing the spark imediately after running at full load for a period. The spark plug should be dry, and be lightly brownish at the electrodes. White-ish color indicates low fuel to air mix, and this causes too high combustion temperature. A black colour indicates a too high fuel to air mix ratio, and it causes carbon build up on the plug.

If you still have starting problems, cylinder/piston compression is the next to check for. This is a more extensive job and should best be left to professionals, unless you are very skilled and have access to special tools required. Compression on modern saws are very delicately balance, so the slightest damage to either the rings, piston or cylinder can cause problems. Is is not alwas worth to replace the cylinder and piston kit, so compare prices and ask for advice at your dealer.

I hope this helps you.

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Hi ya got a old ish tiller in for repair, it is a ISEKI AC40 problem is hard to start & when it starts it will only run for about 10 seconds, so far checked plug which has a good spark, compression ok,...


From your description we will assume it is flooding. If you suspect float problem, check float level, holding the carb upside down the float should be parallel to carb body when needle seat is closed. On metal floats this is accomplished by bending the tab that rides on the needle, units with plastic floats you may have to replace it. Also remove float and shake it, should not be any gas in the float, this will make it flood. Also set carb adjustment screw at 1.5 turns out, may need a little tweek from there.

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1 Answer

Need to know what carb screw adjustment need to be set at weedeater starts for about 4-7 sec then shuts down put new hoses on checked gas filter and cap checked out ok. i pump the ball about 10 times...


If there is a choke adjustment you should set that at full until the trimmer warms up, don't touch the gas. Then repull start at half choke, don't touch the gas either at this time. Then start at no choke, and then set your idle on the carberator with the adjustment screw. Also don't push the primer bulb so many time you will cause the spark plug to get flooded and drown out the spark, which is exactly what is happening.

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Flooded? Try a new plug, or get that one cleaned up. If it is sparking and wet, it should fire, even if it doesn't run, it should spark. Did you put the jets or the needle valves back to where they were? I think they start out at 1 1/4 turns out , then adjust the low and high. If it is fouling out with too much gas, the low speed jet is open too far.

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It sounds like the float is sticking in the carb. Since the carb is higher than the fuel tank it pulls the fuel in by vaccum of the engine. when running at high rpms, it can burn the fuel thats flowing into the carb, when you idle down, the bowl of the carb is filling up with fuel faster than the engine can burn it and causing it to flood. Then when it shuts off at idle it does not want to start back up because it is flooded. To make a long stary short, pull the carb and give it a good cleaning and your problems should be solved.

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Choke is working only has 5000km on bike and once bike warms up it loads up wih fuel and then dies out all ports are clean i tore the carb a part 3 times what should the fuel|air screw be set at.it must be...


It seems the carb/s flooding with fuel and thus it dies, try to reset the float pin and get the correct level of the fuel in the float chamber.
Standard procedure for air-mixture screw setting is u take the screw right in slowly taking care not to over tighten it as it may damage the tip of the screw.
Warm up your bike's engine and thn slowly turn anti clockwise the air-mixture screw to about 2 & a half turns and observe the engine's idling.
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1 Answer

My 8n (6 volt) will not start. Great spark getting


Spark to plugs is great?.....but if they are black (carbon coated) it may not start.
Crank her over and use that choke for 30 seconds.
Pull the plugs ...are they wet with gas?Smell it....is it water or gas.
They should be wet with something.
Are they dry.........No fuel.

If they are wet with gas and NOT black carbon coated and you are SURE you have spark..........time to tow it to start.
You want to turn the engine fast enough to have the crank throw oil onto the cyl walls. Engines need a oil coated cyl wall to run....to seal the rings.The gas from flooding the engine washes the oil away.Put it back and it should fire up.After the first start...it should be OK.
I've started many a engine that others could not start (flooded or sitting for years) with a little oil in each cyl to seal it.....but towing is the better choice if possible.

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