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got 8n to run but with trouble

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ramsfan

12-11-2007 05:47:51

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Thank you for all the help on my previouse post 8n wont start.I got it to start but only after removing the air intake hose from the carb and placeing my hand over the carb to cut the air flow off,After it started it ran fine but i shouldnt have to do this all the time.Is there an adjustment i missed or what....Thank you again for all the help

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soundguy

12-11-2007 06:34:04

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Re: got 8n to run but with trouble in reply to ramsfan, 12-11-2007 05:47:51

What you did is 'choking' the carb.

I'll bet you could do this with the choke knob and have it work.

Choke provides increased manifold vacume to the fuel system... this can help pull fuel thru a partially obstructed fuel system.. or.. i fthere is a large vacume leak, this helps get SOME fuel going.

In general, choke enriches the mix..

weak sparks will fire an enriched mix.

if you have a vacume leak,the mix will be lean.. enriching it with the choke helps to ballance it out.

I think it may be time for a spark test,.. if that shows good, then check carb adjustment.. if that doesn't pan out, then a compression test.

( Also check the obvious.. like.. is your air cleaner stopped up? )

Soundguy

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HCooke

12-11-2007 07:49:45

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Re: got 8n to run but with trouble in reply to soundguy, 12-11-2007 06:34:04

Sometimes the flapper door on the choke butterfly is missing. This can make the choke less effective and the tractor hard to start. This might explain why he can choke it with his hand but not start it otherwise.

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soundguy

12-11-2007 08:30:09

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Re: got 8n to run but with trouble in reply to HCooke, 12-11-2007 07:49:45

maybee less effective ?..but looking at the spring loadedchoke flap in relation to the plate.. it's only a small loss.. and besides..the flap is meant to be open during choke anyway!

Soundguy

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LeeMo

12-11-2007 08:02:24

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Re: got 8n to run but with trouble in reply to HCooke, 12-11-2007 07:49:45

Yep, I've found that on a couple of 8Ns that were hard to start.

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john hunt

12-11-2007 06:06:46

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Re: got 8n to run but with trouble in reply to ramsfan, 12-11-2007 05:47:51

if you have manual for that tractor go the page 40 and read about carburetor adjustment. which great help to get you there to do the fine tune adjustment.. all carburetor not the same in fine adjustment...

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