D100 John Deere will crank but won't start

[reynoldston]

First of all you've got to check if you have spark - To do that, pull the spark plug lead out, take the plug out, and reconnect them both, then, making sure the spark plug is far away from any flammable material, crank the engine over.

If it sparks, the ignition system is good, if it doesn't, you probably have a bad coil.

If it does spark, try putting some of that "Quick Start" directly into the carburettor as Kenny said, and if it starts (with the spark plug back in the engine of course) then stalls, you have a problem with the fuel delivery.

You'll have to give us a wee bit more information before we can help you any further.

Good luck. :thumbsup:

I just don't understand where you have learned to test for spark, but it's not right. To just take the plug out and test it not under compression will not tell you if the plug is any good or not. Back in the day when you had spark plug cleaner machines you always tested the plug under compression after cleaning it. I know they don't clean plugs anymore. (Buy your self a spark tester from any auto parts store, this is the reason they make and sell them.)