Won’t start

[Volant1006 34]

Went out to take the deck off & put the plow on for winter.  Went to start the 312-8, it tried to turn over, than nothing.  Had this issue before from sitting.  Hooked up a jump pack at it would start right up.  Not this time.  With the jump pack hooked up it just cranks & cranks but never turns over.  It has gas in the tank, fuel in the filter.  Tried spraying some starter fluid, still nothing.  Cleaned the spark plug up a bit, still same issue.  Any ideas of what to try next? 

[gwest_ca-(File Mod) 11,798]

Do you have a visible ignition coil with a coil wire going to the spark plug? If so clean the ignition points contacts. They will get an oxidized coating on them preventing an electrical connection when closed. A nail file will get the job done and then drag a clean strip of paper through them a few times to drag out any contamination.

[Wishin4a416 2,259]

I dont understand what you mean it cranks and cranks but doest turn over. Do you mean start? If so pull the air cleaner and spray some gas directly in the carb throat with a spray bottle. I got one that does that and it is getting a new electric fuel pump. Like said above check for spark.  Good luck.

[Volant1006 34]

I will try to check for spark tomorrow.  I replaced the spark plug but did not resolve.  
And yes it cranks but does not start

[953 nut 62,687]

4 hours ago, Volant1006 said:

it tried to turn over, than nothing.   Bad battery or battery cable ends may be corroded or not tight, check grounds too.

Is the engine a Magnum or a K series?

[Volant1006 34]

1 hour ago, 953 nut said:

Is the engine a Magnum or a K series?

Magnum.  When I turn the key the headlights turn on and are bright.  I’ll double check the battery connections

[gwest_ca-(File Mod) 11,798]

With a Magnum you have no points to clean and the magneto ignition in the Magnum very seldom fails.

You ignition is self-powered and to shut it off the magneto/ignition wire is grounded. Never allow any battery power into the ignition wire - that will release the magic smoke.

With the ignition on and the engine not running are any of the idiot lights illuminated? If so that is the circuit at fault. Ignition is controlled by the pto switch (pto must be off) and/or operator must be in the seat to keep the ignition wire from being grounded which shuts off the ignition.

Down load this 5 page file. The ignition circuit has it's own diagram.