Engine problem John deere 40

Mikemul · Jun 22, 2020

i have a problem with my john deere 40, when the tractor idles there is no problem. only when you accelerate it starts to pop softly. it runs at a fixed speed but through that you hear a popping sound every now and then. who knows what this can be? I have already put new bows and bows caps on it.

ET · Jun 22, 2020

Ignition problem, start with new plugs.

Rusty wheel · Jun 22, 2020

Might need a valve job.

M-MAN · Jun 22, 2020

Don't know what you mean by bows and bow caps.

Of course you would start with new points and plugs. Check your timing. Adjust your valve lash." sounds like they may be too tight ". If that doesn't fix it there is probably a hole burned through in the manifold.

Roy Suomi · Jun 22, 2020

Been sitting for a while ? Maybe valve sticking ?

Maw7989 · Jun 25, 2020

My 630 was doing the same thing. When I pulled the wire off number 2 plug it wouldn't idle on number 1 only but would run roughly at higher rpms. Pulled carb and deep cleaned it and it runs like a top. I thought ignition too. New plugs, made new wires, new cap and condenser.

Engine problem John deere 40

Mikemul

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ET

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Rusty wheel

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M-MAN

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Roy Suomi

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Maw7989

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