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Tractor Talk Discussion Forum

John Deere H Problem

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Bill Becker

07-12-2018 06:10:54

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When I start the H it spits and sputters and bangs. What is the issue? Is there something wrong in the magneto? Thanks for the help.

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07-12-2018 21:16:46

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 Re: John Deere H Problem in reply to Bill Becker, 07-12-2018 06:10:54  
Lean mixture caused by worn out carb throttle shaft/bushing and / or leaking gaskets or cracked or leaking manifold. Will make them spit , pop , and bang like a shotgun. Usually running with 1/2 choke or so will even them out if this is the issue.

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07-12-2018 09:26:08

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 Re: John Deere H Problem in reply to Bill Becker, 07-12-2018 06:10:54  
Old or watery gas?

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James Howell

07-12-2018 07:10:38

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 Re: John Deere H Problem in reply to Bill Becker, 07-12-2018 06:10:54  
"Is there something wrong in the magneto?"

You might consider checking the timing on the No. 1 (flywheel side) cylinder.

To prevent the tractor from accidentally starting:

Remove the spark plug cable from the No. 2 spark plug.

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Make sure the gas is turned off.

Lock both brakes.

Transmission should be in neutral and the hand clutch should be disengaged.

This is one method of checking the timing.

Remove the No. 1 spark plug on the flywheel side.

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Place your finger over the hole and rotate the flywheel in the running direction (counter-clockwise) until you feel pressure (compression) of air in the cylinder.

Continue rotating the flywheel counter-clockwise slowly until the L. H. IMPULSE mark on the flywheel lines up with the reference mark on the gear cover.

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Loosen the two cap screws securing the magneto.

Tap the top of the magneto toward the rear of the tractor a little at a time until the impulse trips.

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Tighten the cap screws and continue rotating the flywheel counter-clockwise until you see a spark at full pressure (compression) for No. 1 cylinder.

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Hope this helps.

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07-12-2018 06:48:30

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 Re: John Deere H Problem in reply to Bill Becker, 07-12-2018 06:10:54  
Could be magneto could be carburetor needs to be cleaned

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07-12-2018 06:19:03

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 Re: John Deere H Problem in reply to Bill Becker, 07-12-2018 06:10:54  
carbon tracks in the cap?Or maybe a sticking valve?

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