John deer gx75 no start

[Jakob27724]

I have a John Deere gx75 and it won’t start after I parked it for winter. It’s has great compression and a clean carb and is getting fuel. So I know it is ignition, it cranked over fine and has great spark but it still won’t fire. I was wondering is if it has some sort of timing issue with the spark if that’s even possible.

 

[Scrubcadet10]

i would say the flywheel key may have sheared, but usually they don't shear when just sitting parked
How did you verify it's getting fuel? does the spark plug smell like fuel?
remove the airfilter and spray starting fluid, carb cleaner/parts cleaner or a small amount (tablespoon or so) of gasoline straight through the intake. then try to start. if it runs and dies you've got a fuel delivery issue, most likely a dirty carburetor.

 

[Jakob27724]

i would say the flywheel key may have sheared, but usually they don't shear when just sitting parked
How did you verify it's getting fuel? does the spark plug smell like fuel?
remove the airfilter and spray starting fluid, carb cleaner/parts cleaner or a small amount (tablespoon or so) of gasoline straight through the intake. then try to start. if it runs and dies you've got a fuel delivery issue, most likely a dirty carburetor

 

[Jakob27724]

I know it’s getting fuel because I have sprayed fuel in the spark plug hole quick put everything back on and it did nothing I also sprayed the carb and through then carb into the engine no luck at all so I’m thinking it’s timing

 

[Scrubcadet10]

Okay. Probably so.
And did you use a spark tester, or did you ground the plug to the engine block? Plug could be bad.
The main thing in ignition timing is the flywheel key it aligns the flywheel to the crank.

 

[Jakob27724]

Okay. Probably so.
And did you use a spark tester, or did you ground the plug to the engine block? Plug could be bad.
The main thing in ignition timing is the flywheel key it aligns the flywheel to the crank.

It had great spark just won’t start I was wondering what ignition system it had or if it could be timing from the ignition

 

[Scrubcadet10]

did you check the spark with a tester like this, or ground the plug against the engine block?.

 

[Scrubcadet10]

Anyhow, on the ignition system, it depends on the 'age" of your engine. I believe that model uses a FC290V (if you can get the complete engine model # that will be very helpful, FC290V_ _ _ _)
Most consist of your Ignition Coil (sometimes called a magneto)
Flywheel which has the magnet to produce the current and of course the spark plug.
Now, most FC290's also have an Igniter,
Which is basically takes the place of points, and usually when they stop working, you have no spark at all (From my experience).

So since you've tried spraying in the fuel in the plug hole and you've got good spark, i think the next step is to remove the blower housing and check the flywheel key.
this video gives a good "general info" on the flywheel key.

you can see it's sheared in the video... now if the key is good it will make a perfect square in the slot.

 

[100 td]

Parked running, now won't start. Safety switch or fuel 99% of time, varnish in carb, water or gunk in carb, crap fuel, electric clutch switch, brake or seat switch, less than 1% chance of timing fault.

 

[Scrubcadet10]

Parked running, now won't start. Safety switch or fuel 99% of time, varnish in carb, water or gunk in carb, crap fuel, electric clutch switch, brake or seat switch, less than 1% chance of timing fault.

that's what i figured, but he said it wont even start with fuel directly in the plug hole. and has good spark.