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8N carburetor problem

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Tom Bleakley

05-09-2001 07:30:10




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Went out to the old 8N to start it for the first time this year, and with a jump, she fired right up, ran for 60 seconds and stopped. Then after cranking for at least a minute, it wouldn't even fire. The carb, however, was flooded and leaking gas from the gasket.
The rotor and condensor were replaced last year.
I replaced the coil, thinking it was getting gas, but still - it wouldn't fire. Again, the carb was flooded, so I checked the plugs, and they were perfectly dry.
Now I'm thinking the carb is bad, so I rebuilt it, but I couldn't get the main jet to budge, so I left it in. I thought I was blowing air through it via the metering tube, but maybe I wasn't. After reinstalling the 90% rebuilt carb, the engine fired once and died. Again, the carb was flooded and the plugs were dry.
My question is: Should I try poking something through (or even drilling out) that main carb jet, or replace the carb with a new one ?

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OKcity8N

05-09-2001 11:23:46




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 Re: 8N carburetor problem in reply to Tom Bleakley, 05-09-2001 07:30:10  
Dell is right on the mark. I recently rebuilt my carb with help from the board and my books. My main would not budge either. I did the rebuild mostly so I had a baseline of new parts instead of relying on what the previous (deceased) owner had done. Since it was working before the rebuild, I wanted to make sure it worked afterwards. I left the jet, cleaned it with carb cleaner and lots of compressed air. Make sure the float is working correctly. The 90% rebuild should last a long time since these Ns aren't too fussy about getting fuel as long as you don't starve em or overfeed em.

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TimK

05-09-2001 11:23:41




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 Re: 8N carburetor problem in reply to Tom Bleakley, 05-09-2001 07:30:10  
What's a main jet ? Is it the slow speed, high speed, or in some cases economizer jet ? Use the right nomenclature. At any rate if it is the slow speed jet, the easiest one to get to, I had to drill mine out since it wouldn't budge and someone else had gummed up the screwdriver slot. Just be careful, and you won't damage the threads. Once you get that jet out and thorougly clean and blow out the orfice, you can then exclude that as a possible source of your problem, which in fact it may be. It always pays to do it right the first time, they say. Then like Dell says, it sounds like a fuel problem. My $.02

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8NRay

05-09-2001 10:04:31




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 Re: 8N carburetor problem in reply to Tom Bleakley, 05-09-2001 07:30:10  
My 2c worth is that the carb is flooding is why
you are having problems. Make sure the float
setting is correct. Once it dies and you notice
the flooding, did you try to open choke fully,
open throttle fully and then give 'er a go?



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Dell (WA)

05-09-2001 08:26:02




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 Re: 8N carburetor problem in reply to Tom Bleakley, 05-09-2001 07:30:10  
Tom..... ..For once, I'll agree with you, you've got a constipated carburator. (grin)

Get a $2 can of carb squirt'em witha straw and put on your safety eyeglasses (don't ask) and cleanout all the carb jet holes and bleeds. If'n you feel you need to "probe" any holes, I use some heavy duty wirecore fishing leader, the nylon won't damage the jets like wire will.

Don't try to remove your main jet, cuz you'll break it off and then you will have to buy a carb.

A 60 second run almost makes me think of "bad gas" flow. I assume that you are savvy enuff to check and clean all 3 fuel filters including the one in the carb elbow, the hidden one inside the fuel tank and the one in the fuel cuttoff valve..... ...Dell

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mjoyner

05-09-2001 19:53:26




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 Re: Re: 8N carburetor problem in reply to Dell (WA), 05-09-2001 08:26:02  
Got the same thing with a 8N that my brother owns. Carb floods, getting fire. Was running fine, started to run rough, then quit. It will hit and run briefly if you give it a hard choke with your hand over the carb inlet.

Disassembled carb, didn't look too bad inside. It's actually only a year or so old. How do you check float level? Hold upside down and set so top of float is level with carb top? Is main jet behind the big bolt in the bowl? What is the small screw just on the front side of the float bowl? I've done carbs many times and it's really odd to get fire, have gas pouring out and not start! It seems either internal stopped up or vacuum leak? Sorry so many Q's. But would appreciate any and all help!

Mike

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