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Another ways to check the engine compression

Remove the spark plug and ground the plug wire on the engine.Seal off the spark plug hole with your thumb.Operate the starter.If the compression pressure blows your thumb of the hole,the compression is adequate for the engine to run.

With the spark plug in place remove the cooling shroud/recoil starter mechanism and spin the flywheel counterclockwise.The flywheel should change direction sharply,if so the compression is adequate for the engine to run.


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Where is the starter on a 1993 heritage softail


Above the transmission, behind the rear cylinder.

Do a compression test. Check for spark at the plugs BUT best to have new plugs.

on any four stroke engine, you must have three things for the engine to run. You need fuel, spark, and compression. The easy one to check is the fuel. Take your air filter off and make sure you're getting fuel to the engine. Then, check your spark. Pull the spark plug wires off the spark plugs in the head and insert another set of plugs in the wires. Ground the plugs against the engine, turn the ignition switch on and press the start button. Watch the plugs to see if you have spark. The next test is compression. With the engine cold, remove the spark plugs. If you have a compression gauge, connect it to one of the heads and spin the engine over with the starter. If you don't have a gauge, simply put your finger over the spark plug hole. Turn the throttle wide open and press the start button. You should show about a hundred pounds of compression if you have agaugeor the compression should blow your finger off the hole with a good deal of force if you're checking it that way. If you have all three of these and they're timed correctly, the engine should run. If the engine won't run, find out which of the three elements is missing and work from there.

May 06, 2014 | 2009 Harley Davidson FLHX Street Glide

1 Answer

won't start


hi

check the compression,ignition and the carburetor.These are the three things an engine needs to run.If you have compression(put your thumb on the spark plug hole,spark plug removed,operate the starter.If the compression blows off the thumb of the spark plug hole,it is adequate for the engine to run).Try priming the engine(put small amount of gas in the cylinder)and start the engine .If the engine only runs the fuel you put inside you have a fuel delivery problem to find and fix.

regards savumihai71

Dec 08, 2009 | Garden

1 Answer

engine will not stay running


Hi

When the engine stops check the spark at the spark plug.Check compression(remove the spark plug and ground the plug wire on the engine,seal the plug hole with your thumb.Operate the starter.If the compression preasure blows your thumb off the hole,the compression is adequate for the engine to run.Now priming the engine(put some gas into the spark plug hole,back the spark plug and try to start the engine.Let me know. savumihai71 regards

Dec 10, 2008 | Toro Garden

2 Answers

mtd snow blower no start


HI

Check the ignition.Check the compression(remove the spark plug and ground the plug wire on the engine,seal off the plug hole with your thumb,operate the starter,if thecompression preasure blows your thumb off the hole the compression is adequate for the engine to run.Be careful not to touch the plug wire as this is done.Try to start the engine and see what is happening.Please let me know!

regards savumihai71

Dec 05, 2008 | Garden

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