Question about Electrical Supplies
Getting gas spark plug is fireing but will not start
Check the gas shut off is on. Check oil, some have a safety shut off on oil .Clean filters and carb
Posted on Jun 17, 2014
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Posted on Jan 02, 2017
Most gasoline engines need three basic things to run: proper air/fuel mixture, sufficient compression, and a properly timed spark. Check the easiest, cheapest things first, then check the "Gee, I forgot to turn on the gas" kind of things next, then work your way onwards from there.
Compression can be guesstimated with the proverbial thumb-over-the-empty-spark-plug-hole routine as you turn it over casually to check compression. If it doesn't blow your thumb out of position, you could have a hole in the piston (overheating response) or a stuck or damaged intake or exhaust valve.
Check for fuel flow by carefully disconnecting the fuel line to the carburetor and letting some run into a tin can (no styrofoam coffee cups, please). It should dribble freely. If not, you have to back-track the line and find out where the blockage is.
Spark is one that sounds like you've already tested (spark plug out of the cylinder head, hooked up and laying on the metal engine as you turn it over?) so check timing. You will probably need a manual for this test, although a good estimate is that the plug should fire just a wee bit before Top Dead Center position of the piston. Like I said, a manual comes in handy here.
From what you've mentioned, though, I'd start trouble-shooting at the fuel flow part first.
Posted on Jun 08, 2009
try leaving your choke partially on it may not be getting all the gas it needs,see if it will run then, it wont run full throttle, but this will tell you its not getting enough gas
Posted on Oct 07, 2009
First check the surface between the rotor and the coil and make sure there is no rust. If there is take some fine emery cloth remove the rust from both the rotor and coil. Use a noncondutive cleaner to remove any metal particals. If you remove the coil you can use a standard business card to reset the gap.
After completing this process if it still does not start check the plug and make sure you have a spark in the plug gap. You can test it by removing the plug and reattach the plug wire then lay the plug on the head and try starting the engine. The spark should be a bright blue. If you do not have any spark recheck the plug gap. If the spark is a red color your coil is weak and needs to be replaced.
Posted on Nov 25, 2009
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