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8N CARBURETOR OVERHAUL??? NO VACCUM LEAK

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GERALD

10-28-2000 14:50:31




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Have a mild popping out of the exhaust pipe at idle. Intake/exhaust manifold have been replaced. Before carb overhaul I could not get the idle adjusment to work. After the car has been overhauled I can only turn the idle adjusting needle 1/4 of a turn before the engine starts to faulter.I have checked for vacuum leaks at the manifold and at the carb with nothing found. Does anyone have any other suggestions? Other than the small amount of adjustment I am only getting out of the idle adusting needle, the tractor runs fine, no loss of power.

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Dell (WA)

10-29-2000 00:37:11




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 Re: 8N CARBURETOR OVERHAUL??? NO VACCUM LEAK in reply to GERALD, 10-28-2000 14:50:31  
Gerald..... ..you're not going to like this answer, you are running "LEAN".

Since you claim to have checked for manifold and carb shaft vacuum leaks (the obvious places to start looking for lean).

The next likely suspect is a partially clogged idle jet. Dirt happens. To service, will require removal and dissasembly. Since you claim to have just "overhauled" your carb, you should be up on the "learning curve" and should not take so long this time..... ...Dell

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norm-wy

10-28-2000 16:13:07




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 Re: 8N CARBURETOR OVERHAUL??? NO VACCUM LEAK in reply to GERALD, 10-28-2000 14:50:31  
Gerald
With your enghine running at an idle, try spraying some WD-40 or starting fluid (ether) around the carb. If it speeds up, you have found your leak. Many times you can have a leak around throttle shaft, gasket etc and the spray will find it. FWIW



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Jim

10-28-2000 16:05:20




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 Re: 8N CARBURETOR OVERHAUL??? NO VACCUM LEAK in reply to GERALD, 10-28-2000 14:50:31  
The popping sound may be a burned valve i.e. one that is not sealing properly. A compression and cylinder leak down test can tell you alot. You can e-mail me if you would like more info.



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