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8N second verse same as first

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ron,ar

07-23-2006 20:58:09




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Well almost the same. I am still having problems with my high speed adjustments. No matter what I do I cannot get the thing to run right with the high speed needle turned anywhere close to what you guys say it should be. Mine has to be backed almost all the way out to run right. I have already tried the vacuum leak search with propane/choke cleaner/WD40 and found no leak anywhere. I removed the carb tonght and pulled the main jet (economizer/fuel limiter) out, re-installed the main nozzle tube and reinstalled. I set the idle adjustment needle at 1 1/2 turns and the high speed needle at 2 turns. After warm up I re adjusted the idle at about 3/4 turn and went to WOT. It died, no surprise there,I re-started and slowly opened the throttle, adjusted the high speed needle and it runs really good at 3 turns out. I went back to idle, then quickly back to wide open throttle. No surging, no popping or hesitation. I suspect this thing will consume a lot of fuel without this jet in there but it does show me I am still dealing with a fuel starvation issue.

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ZANE

07-24-2006 03:51:22




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 Re: 8N second verse same as first in reply to ron,ar, 07-23-2006 20:58:09  
Sometimes doing too good a job on the carburetor can cause a problem that no amount of "adjusting" will overcome. That is when the two mating surfaces of the carburetor are fitted so snugly and air tight and when the bowl vent is plugged by some insect or foriegn matter that the bowl can not get any atmospheric pressure inside the bowl. When this is happening sometimes the engine can idle but it will not under normal settings be able to draw any gas into the intake. Gas is drawn into the venturi area of the carburetor by low pressure and if there is no vent to the bowl area the bowl area will soon be the same barometric pressure as the pressure in the venturi area of the carburetor and then no gas can be pulled into the intake.

Just as an experiment to see if that could be the problem you can take the bowl off the carburetor and cut out about a quarter inch of the gasket somewhere on the bowl of the carburetor and try it this way. If that fixed the mixture problem it means that the vent is blocked somewhere and some how.

Zane

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John (TR)

07-24-2006 03:50:02




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 Re: 8N second verse same as first in reply to ron,ar, 07-23-2006 20:58:09  
Ron
I beleive the carb has 3 jets; main, idle, and economizer. I don"t remeber which 2 will but 2 will interchange and I think it"s the economizer and main. Main jet has the larger bore and sets under the long tube, econ goes in the top part. I had them reversed in mine and had all kinds of strange happenings especially under load. Also get a small guitar string and run through the passages in the carb, I dug out a small piece of teflon tape this way that had been causing problems for some time.

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Dell (WA)

07-23-2006 22:15:42




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 Re: 8N second verse same as first in reply to ron,ar, 07-23-2006 20:58:09  
Ron..... ...learn to "read the color" of yer sparkies center ceramic insulators for lean/rich carburation condition. Its not "black-magic".

Much to the dismay of the anti-smog environmental bureaucrats, every carburator and engine combination will adjust differently. So you can't just count turns and say the carb is adjusted correctly. And my carb is going to adjust differently on your engine.

I know that you've been told the carb jet sizes, do you need to be told again?..... ...respectfully, Dell

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ron,ar

07-23-2006 22:43:14




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 Re: 8N second verse same as first in reply to Dell (WA), 07-23-2006 22:15:42  
Dell, I have good spark, good blue spark. With the carb adjusted like I have it, it should be running rich as he11 but it is not.The two jets WILL NOT interchange, one, the idle jet,has a larger "shoulder" on it than the other, preventing it from going in the hole the high speed nozzle and jet go in. The high speed jet does indeed have the larger orifice and both have the same threads but they are not interchangable. I also understand that no two carbs (whether this model or a 750 holley dumble pumper) will adjust the same. However, with the jet all the way down, it will back out 81/2 rounds before running out of threads. If I have the economizer/fuel limiter installed, I have to back it out a min of 6 rounds, usually closer to 8 to make it run right. I could easily go get another carb and maybe it would adjust to suit me, maybe not, but I want to learn why this one won't adjust to suit me.

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Russ SoCal

07-24-2006 07:23:41




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 Re: 8N second verse same as first in reply to ron,ar, 07-23-2006 22:43:14  
ron,
The economizer jet and the one called a "fuel limiter" jet, which is the main jet/high speed jet, are 2 different animals. Unfortunately, they share the same outside diameter; but not orifice. The idle jet is smaller OD, goes in the top half of the carb and generally minds its own business. Your carb may or may not even have an economizer jet.
Russ



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Gregg E

07-23-2006 21:20:03




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 Re: 8N second verse same as first in reply to ron,ar, 07-23-2006 20:58:09  
Is you air cleaner clean, I mean are you getting good air flow to the carb?



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ron,ar

07-23-2006 21:41:56




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 yes in reply to Gregg E, 07-23-2006 21:20:03  
It does this with or without air cleaner tube connected.



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CENTAUR

07-23-2006 22:04:23




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 Re: yes in reply to ron,ar, 07-23-2006 21:41:56  
I would not pay much attention to how many turns in or out.Your 8n will use 1 gal-per hr when its right pulling the maxium.



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