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9N only runs on starting fluid even after carb reb

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John R P

05-26-2007 19:22:42




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My 9N just died the other day, it would run while I sprayed starting fluid in it but stopped when I stopped spraying. The carb is getting gas because fuel runs out when I open the drain plugs.
So I rebuilt the carb but it still acts the same way. I sprayed carb cleaner through the idle jet and it comes out through all the holes in the carb throat, and did the same with all other holes in the carb. What could I be missing?

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John R P

05-27-2007 06:27:09




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-26-2007 19:22:42  
Yeah you're probably correct that I'm looking at fuel when I should be looking at spark. Not used to working on these low voltage systems. I've got a set of Champion H12C plugs sitting on the bench so I'll throw them in first and take it from there. Thanks.



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Henry M

05-27-2007 03:23:20




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-26-2007 19:22:42  
You could always hot wire around the ignition switch to eliminate that option.



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Dell (WA)

05-26-2007 21:39:42




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-26-2007 19:22:42  
John..... .one of the founding members of this great ol'N-Board, used to claim 80% of all carb problems were found in the IGNITION system. Sumptin' to tink'bout, eh?

Yer use of low-flashpoint ether-squickstart is leading you estray. QUIT-ITT!!!

PROVE yer sparkies are good. Make a CALIBRATED sparkie tester outta enny ol'sparkie. Bend the side electrode out for a full 3/16" gap. Clamp the sparkie shell to enny convenient grounding bracket. Now plug enny sparkie wire to yer calibrated tester and try to start yer engine while watching yer calibrated tester for BLUE-SNOTT sparkies. Iff'n they's wimpy yellowish-orangish poor excuse, you know where to start lookin'.

For reference purposes, my eazy starting 6-volt 8N sparkies will jump a full 3/8" gap.

You don't want to go to all that trouble to make a tester? Then REPLACE yer sparkies with new clean dry AutoLite AL-437 sparkies. (gap = 0.025") Why? 'cuz you done FLOODED yer sparkies with INVISIBLE no-lead gasoline deposits and them lazy sparkies are dribblin' down the side of the center insulator instead of jumpin' the gap an' makin'widd da sparkle. Replace'em ennysway; $8 (cheap)

Why'd yer tractor quit out in middle of field? My guess yer weaksister ignition switch hick-upped. $10 (cheap) REPLACE IT..... ....Dell, yer self-appointed sparkie-meister

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John R P

05-27-2007 19:53:04




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 Re: 9N only runs on starting fluid even after carb in reply to Dell (WA), 05-26-2007 21:39:42  
Well I put in new plugs, still does the same thing. So then I poured a little bit of gas in the carb intake instead of starting fluid and it started right up, then died as before. However, since it ran fine on gas until it used it up, I no longer think it's a weak spark issue. I had the battery hooked up to a charger while cranking so voltage was right up there. Maybe my carb rebuild wasn't that good and something is still plugged up? The float bowl is full of gas but it doesn't seem to be sucking into the motor, so maybe I still have a plugged jet? I assumed that because I could spray carb cleaner through all the jets it was ok, but maybe something is too restricted to suck fuel through. I'll probably take the carb apart again tomorrow morning if I can't think of anything else.

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John R P

05-28-2007 08:25:40




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-27-2007 19:53:04  
Ok, I think I fixed it. Took the carb apart again and the jet under the main nozzle was clogged, (I never took it out on the first rebuild, d-oh!) I'll go out to the shop this afternoon and stick the carb back on the tractor, but I'm betting that was the problem all along.



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John R P

05-28-2007 18:35:51




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-28-2007 08:25:40  
Yup, that did it. Sometimes the carb problem is actually the carb, not the ignition ;)



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soundguy

05-26-2007 20:58:21




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-26-2007 19:22:42  
Choke help any?

I agree with the others.. if it ain't spark.. check vacume...

Soundguy



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John R P

05-27-2007 06:46:07




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 Re: 9N only runs on starting fluid even after carb in reply to soundguy, 05-26-2007 20:58:21  
No the choke doesn't help. Once I burn off the starting fluid it stops. Probably is a spark problem.



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soundguy

05-29-2007 13:02:42




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-27-2007 06:46:07  
Easy to check vs guessing.. pull a wire and plug and see what ya got..

Soundguy



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John R P

05-31-2007 17:47:51




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 Re: 9N only runs on starting fluid even after carb in reply to soundguy, 05-29-2007 13:02:42  
Turned out to be the carb after all. See above posts.



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Sean (TX)

05-26-2007 19:37:51




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-26-2007 19:22:42  
Have a nice blue spark?



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Tom N MS

05-26-2007 19:36:38




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 Re: 9N only runs on starting fluid even after carb in reply to John R P, 05-26-2007 19:22:42  
Most likely weak spark..Ground a plug to the head and turn it over with the starter. See if you have strong blue spark.



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Bob Harvey

05-26-2007 19:39:06




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 Re: 9N only runs on starting fluid even after carb in reply to Tom N MS, 05-26-2007 19:36:38  
Could be a manifold leak, try spraying your starter fluid at the manifold when cranking.



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Bob Harvey

05-26-2007 19:40:20




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 Re: 9N only runs on starting fluid even after carb in reply to Bob Harvey, 05-26-2007 19:39:06  
Remove air intake and see if the booger is 'sucking'.



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