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8N engine runs better at start

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natureman

04-21-2002 05:34:13




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My 52 8N idles real smooth with very low throttle setting for about a minute or two then will begin running rougher, popping and sputtering(Valve?)a little and eventually die at the low idle setting. It is not real bad and the engine runs smooth and seems to have plenty of power when it is pulling no matter how light or heavy the pull. I've noticed it starts best cold by setting throttle to lowest setting and not choking. I shut off the gas flow when I shut the tractor down or the carb leaks gas(I know what is causing that). I rebuilt the carb last winter and have replaced plugs, plug wires, dist. cap, rotor, and points. Anyone have any expert opinions? I'm wondering if the prob. could be in my distributor...like the cent. advance? But to me, other than a bad valve or two because of the popping, the low throttle setting symptoms point to carburation. I took great care in rebuilding the carb and used the premium kit. Also, I have set and rest the mixture screws. After the tractor is warm it will restart good...if I give it half throttle and pull the choke out and immediately let it go back in as I am cranking. Any help would be appreciated. I love to hear a smooth sounding engine. Thanks

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bg

04-21-2002 20:56:11




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 Re: 8N engine runs better at start in reply to natureman, 04-21-2002 05:34:13  
If the carb checks out OK and you continue to hear the light popping sound, consider checking the symmetry of the rubbing-block cam on the end of the distributor shaft, as well as making sure the shaft bushing is not worn and that the breaker plate screws are secure. A little wobble of the distributor shaft or a cam that is lop-sided can cause such problems



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Larry

04-21-2002 09:43:07




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 Re: 8N engine runs better at start in reply to natureman, 04-21-2002 05:34:13  
Ron is correct. The leaking situation between the needle and seat and the float drown the engine with fuel when at idle.

Not a serious problem. The fact that at high rpm the engine does fine enforces this theory.

Regards.



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Ron

04-21-2002 05:59:08




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 Re: 8N engine runs better at start in reply to natureman, 04-21-2002 05:34:13  
Sounds like float valve leaking or float set at incorrect level.



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