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8N won't run without choke

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RobS MI

09-14-2005 10:04:14

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I have an 8N that will not stay running without the choke on. It appears that the govener is pulsing between full open and closed. If I manually hold the butterfly that is controlled by the govener open it runs good but revs high. What should I be looking at or trying to fix.

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RobS MI

09-16-2005 06:36:17

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Re: 8N won't run without choke in reply to RobS MI, 09-14-2005 10:04:14

Thanks guys,
I will have to check these out this weekend.

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Carl Johansson

09-15-2005 07:00:56

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Re: 8N won't run without choke in reply to RobS MI, 09-14-2005 10:04:14

OK Rob,
To follow up my last post:
I ordered a new replacement carb from Antique Tractor supply 140 bucks plus 13 bucks shipping(a knockoff of the original MS unit on the tractor).

I ordered it monday - and it was here on wednesday - bolted it on - and the tractor fired up and runs great - no more need to choke.

Thats how I solved cmy "no run W/O a choke issue

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Jerry/MT

09-14-2005 12:24:56

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Re: 8N won't run without choke in reply to RobS MI, 09-14-2005 10:04:14

If your ignition system checks out, look for a leaky/cracked intake manifold or a leaking gasket/connection at the carburetor attach flange to the intake manifold. Both can cause air to leak around the carburetor and lean the mixture.

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Dell (WA)

09-14-2005 10:44:17

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Re: 8N won't run without choke in reply to RobS MI, 09-14-2005 10:04:14

Rob..... ...sounds like yer governor is trying to do its job.

Requiring choke to keep running is usually a WEAK SPARKIES ISSUE. Rich mixture is eazier to ignite with weak sparkies.

Eazy check. Make yerself a calibrated sparkie tester by bending enny sparkie side-electrode OUT for FULL 3/16"-gap. Now ground yer metal sparkie shell with somesort of clamp, connect enny sparkie wire; crank yer engine and WATCH yer sparkies jump the gap. Do they jump with blue-snott authority? or are they a wimpy yellowish-orangish poor excuse?

And while yer lean-burn issue maybe clogged carburator passages, one of the founding members of this great N-Board ussta claim 80% of all carb problems were ultimately found in the ignition system..... .....Dell, yer self-appointed sparkie-meister

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Carl Johansson

09-14-2005 11:26:22

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Re: 8N won't run without choke in reply to Dell (WA), 09-14-2005 10:44:17

Dell knows of what he speaks - but:
I am having the same problem. I looked for week ignition switch and spark - unfortunately that wasn't the issue for my tractor. So I checked the fuel flow to the carb - fuel was getting from the tank to the carb - so I needed to look into the carb. I couldn't budge the drain plug on the bottom of the bowl - so I took the carb off - opened it up - andit was rusted up inside - not rust particles floating in the gas - but the insides of the carb was all rusted up.

A rebuild kit costs 40 bucks - a rebuilt carb costs between 175 and 225 depending on the source. A new carb cost 140 bucks.

I opted for the new carb - antique tractor parts (sponsors this forum) and myoldfords.com both have replacements available.

My carb should be here tommorrow - I'll let you know if it cures the problem.

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