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when you pull the rope with the plug out do you get any gas coming out of the plug hole? It sounds to me like you have a faulty carburetor that is causing the unit to load up on gas stopping the piston from being able to move all the way with the plug in it
Here are the basics. You need: spark, fuel, air, compression, and timing to make it run. Clean the spark plug. Inspect the fuel lines. Are the hard/brittle? Do they connect to the filter in the gas tank? Clean the air filter. When the spark plug is out, put your finger over the opening and gently pull the rope. Do you have compression? Most common repairs needed are usually fuel lines and carburetor work.
The gas is going into the the crankcase. When the piston goes down it opens the ports and allows the gas to go down untill it could fill the crankcase. Start by blowing compressed air into the spark plug hole and allowing the piston to go to it's lowest position. This will usually remove any liquid gas from the crankcase. Next get yourself a small spray bottle and fill it with the same gas mixture your trimmer uses. Now you can spray a small amount into the spark plug port, replace the spark plug, full choke and pull till it pops. set to half choke and pull. I have also sprayed into the carb but you must open the throttle to allow the gas to enter the combustion chamber. Spray,close throttle,pull choke and pull. You may need to do this a few times for it to start. After it starts let it run at half choke for awhile until it warms a bit then open choke and go to full throttle. If this dosen't work it's possible to have other problems.
Do you mean hard to start as in you have to pull and pull to get it started or do you mean hard to start as in tough to pull? If you have to pull and pull then the carb screws (gas and air) need to be adjusted. Start by turning them all the way in and the a turn and a fourth turn out and adjust from there. If you mean just tough to pull, the some newer weedeaters have lots of compression and since they come from the factory this way it can't be changed. It will always be tough to start.
Hi I have a craftsman 4 cycle model no. 316.791970 gas trimmer. When I pull on the rode there is little resistance . I took the sparkplug out and put a flash light down the hole and there is a thing that is moving . What should I look next, or do you know what is wrong? Thanks for any help! I've had it only 3 years and already Sears have replace the clutch assy.
it's doubtful that bad gas caused this, it sounds like the cord was back-lashed and partially came off the recoil pulley. Remove the recoil cover and ensure the cord is all on the pulley, make sure the rewind mechanism works smoothly before re-installing.
those are usaully under your pull start cover and if its broke you can buy a new rope but if its broke near handle i would open it and retie it to save ya money. but remember to wind spring a little to keep tension on it before pushing it through the hole for handle.
Clean the carb wire gauze air filter behind the roto-choke knob. (undo the nut/washers & long bolt)
Deteremine if fuel is being fed to cylinder - Fully depress & prime the bulb about 7 times, turn to full choke. Pull start cord about 7 times. Remove spark plug see/smell fuel fumes/vapour present in cylinder
Determine if compression is weak - remove plug, put finger over plug port, pull start cord. Should be evident of resistance/pressure build up when cord is pulled.
Of course brand new plug!!! as above (I would try this first)
Hope this helps
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