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If there is no spark then I would suggest checking out the plug wire for cracks or breaks If there is none present then the ignition coil could be finished Take it off take it into your small engines dealer and get him to test 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.
Remove your spark plug, take a rag and dry it up shoot a little WD-40 into it reinstall. Do not prime the unit or turn the choke on just pull it should start for you, make sure you are are not leaving the choke on, that is a common mistake.
it is normal to see air bubbles in line when pumping the bulb. to make sure what the problem is, try starting several times, remove spark plug. if dry, yes no fuel, remove the carb. if wet, place plug on engine block and look for blue spark. no spark means you need new plug, plug cord or ignition module
This could be caused by tons of problems. I'm going to assume you've checked the spark at the plug first. If not then you'll want to pull the plug out, leave connected to the wire and check to see if there's a blue spark when you pull the starter string. When my trimmer finally wouldn't start (or keep running) I found there were small cracks in the fuel lines. It was causing problems with the prime (for starting) and then with the running. My engine wasn't leaking fuel so it was hard to find.
I don't mean to over simplify this, but are you using fresh gas? Gas string trimmers are extremely ticky when it comes to gas. They like it SUPER fresh. And while the gas and oil mixture should be right, it can be off a little bit and still run. Try draining all of the gas out, and then filling up with fresh mix. This is ALWAYS my first step with string trimmers, and it fixes the problem 75% of the time.
Hope this helps!!
I found that the plug that came with my unit had an intermittent fault (sparked sometimes, then not all) definately the plug in my case. And yet at first, seemed to start OK, progressively got worse.
OK so youve changed the plug! Now check for spark....Can you see the spark if you pull the cord a few times
(you have to unscrew the plug from the head but leave it connected to lead & rest the plug against the metal cylinder surface using a pair of pliers to steady it and so you dont get a small shock)
If youre getting visable spark when you pull the cord, suspect fuel feed blockage from carb, Test by: Prime the bulb & turn to full choke, pul the start cord, Is there petrol vapour/odour present within the cylinder with the spark plug removed.
Check also gauze air filter behind the roto choke knob is clear, on/off switch (could be damp wd40) Test compression put your finger over the open plug port, plug starter cord, should be a little pressure build up
Hope this helps
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