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JON
JON, Small Engine Technician
Category: Small Engine
Satisfied Customers: 521
Experience:  Husqvarna Service Tech
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I have a Deere la100 that won't start I have replaced the

Customer Question

I have a John Deere la100 that won't start I have replaced the spark plug starter solenoid fresh fuel air filters and oil still not firing up
Submitted: 4 months ago.
Category: Small Engine
Expert:  JON replied 4 months ago.

are you getting spark at the spark plug?

Customer: replied 4 months ago.
I am not sure how would I check
Expert:  JON replied 4 months ago.

either have to have a spark tester, or pull plug with wire still on it, and have someone crank engine over while holding sprk plug edge/side to the engine. you should see spark. if not will need a ignition coil

Expert:  JON replied 4 months ago.

You can also place a screwdriver in plug wire, and hold about 1/8" from engine. have someone turn engine over and see if you see spark jump from screwdriver and engine.

Customer: replied 4 months ago.
Ok just heading back home will check for spark
Expert:  JON replied 4 months ago.

no problem. Let me know the outcome

Customer: replied 4 months ago.
Bought a plug tester and I am getting spark
Customer: replied 4 months ago.
Fuel is getting to plug also
Expert:  JON replied 4 months ago.

okay. If you are getting spark and you are getting fuel, air will be issue. Try putting fuel into cylinder directly and see if it will start up.

Sounds like either compression is low, or there may be a valve issue. valve issue will give you spark, but improper spark timing and not allow engine to start

Customer: replied 4 months ago.
Ok sorry not very mechanically inclined what cylinder do I add fuel to
Expert:  JON replied 4 months ago.

remove plug and squirt small amount of fuel into the cylinder. you can also pour small amount into carb or intake and try to start

Customer: replied 4 months ago.
Still not firing up
Customer: replied 4 months ago.
I can tell you the last time it was running it seemed to run a little ruff on start up and when finished mowing it backfired on shutoff and haven't got it started since
Expert:  JON replied 4 months ago.

If it back fired, I would re-gap the coil and also check the fly wheel key for shearing