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720 Backfires

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Don

03-18-2001 06:40:23

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I have 720LP that is backfiring bad when going
down a hill. It starts easy and runs OK under a
load(although I don't think it has the power it
should have and uses more fuel)I does not backfire
under a load. My first thought was timing. The book says 20 deg BTDC at fast idle, it was running
about 3 deg BTDC, I adjusted to 20 but it backfired bad at fast idle, moved back to 15 deg BTDC and it seemed to run better. Did a little better under a load at 15,but still backfired.
I install new plugs and electronic ignition last
fall. Is there anything else I should check?

thanks
Don

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Spokerd1

03-18-2001 18:46:26

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Re: 720 Backfires in reply to Don, 03-18-2001 06:40:23

Don, If you set the timing as the book said and it was worse on the backfiring. Then that should indicate the distributor is worn or has a lot of slack. Check it out real close. Did you replace the whole distributor when you put electronic ignition on the tractor? I would have said the condenser was bad but you said you had electronic ignition. The problem sounds to be in the ignition system

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Don

03-19-2001 18:57:31

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Re: Re: 720 Backfires in reply to Spokerd1, 03-18-2001 18:46:26

There does seem to be wear in the distributor,
I can move it back and forth a little bit. I also noticed that
with the timing light on the timing would change
about once every tenth time(it would show about
5 degrees difference 1 out of 10 flashes)
I wonder if the distibutor drive gear is worn
or could cam bearing be worn?

thanks don

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Don

03-19-2001 18:56:30

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Re: Re: 720 Backfires in reply to Spokerd1, 03-18-2001 18:46:26

thanks don

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