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Intake leak ???

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bombing range 8

01-15-2001 18:49:08




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i have a 49 8N i just cant figure out, i have changed the points, new carb, plugs and wires and checked numerous other things and it runs no better. it is very hard to start cold or hot, better when hot. when tuning carb you can turn idle mixture all the way in but still runs with very little affect. power screw i can turn all the way out and it still runs,when you go in it will starve for fuel, at about a half turn from seated. good spark, clean filters,two carbs, 12v charged and it has gas. DOES THIS SOUND LIKE A INTAKE LEAK ??. any help would be greatly appreciated !!!!

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ZANE

01-16-2001 04:19:04




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 Re: intake leak ??? in reply to bombing range 8n, 01-15-2001 18:49:08  
If you are absolutely sure that the carburetors you have been trying on the tractor are good then you can see if their is a vaccumm leak by opening the acetylene valve on your torch and passing it around the intake manifold where it bolts to the block. If the engine changes tune when you pass some point then that is where the leak is. If it does not change no matter where you pass the acetylene you don't have an intake leak and should take one of those carburetors to somebody who can fix it or try it yourself by folling these instructions.
Cleaning the N carburator.
If it is as cold as you say the problem may well be the presence of moisture in one or more places in the fuel system. Water likes to go to the bottom of gasoline and the bottom of the system is at the bottom of the carburator.You will never get it to run untill you get the carburator warm enough to melt the ice and get it out some way. The best thing to do is to take the carburator off and take it inside the shop and warm it up and then take it apart. Remove the big high speed jet needle from the front of the carb. It will be facing down and angled to the back slightly.
Be very cautious about the gas in a closed area and have no source of ignition so you don't set yourself of fire with the gas. The bottom of the bowl needs to be cleaned good and then blown out with compressed air. If you have the right tool to do it you need to remove the high speed fuel nozzle. That is the brass thing in the venturi (throat) of the intake that is pointing down and toward the front. It takes a long socket of the right size and don't try to get it out with a pair of pliers or you may get it so it can never be removed and cleaned. There will be several little holes in the jet that come into the bore from the sides and they all need to be opened with a needle of the right size. The best thing to use is a welders tip cleaner as it will have an assortment of different sizes and one will fit. Always use the biggest one you can get to go into the hole,

Be absolutely sure that the orifice in the bottom of the carburetor just below the point that the high speed needles sits when assembled is absolutely clean and free of all foreign material.

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bombing range 8n

01-16-2001 19:48:36




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 Re: Re: intake leak ??? in reply to ZANE, 01-16-2001 04:19:04  
THANKS ZANE
I dont know for sure that both carbs are good. I tried to rebuild the one on the tractor, and i bought a new one at TSC. Both carbs did about the same thing,except the new carb needed a little choke to get started. when i stated cold starts i should have said the first start. SC does not know about cold weather. once it is started the tractor runs pretty good, a little stumble when taking off or fast twist of the throttle. Back to the old carb, on the first crank if you touched the choke it will flood. but wait a little while and hold trottle closed by hand on carb it will sooner or later crank, but acts flooded. Old carb is a 33 and the new one is a 241, if that matters? Thanks for the help...

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bombing range 8n

01-17-2001 18:49:43




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 Re: Re: Re: intake leak ??? in reply to bombing range 8n, 01-16-2001 19:48:36  
any help on problem would be great.
thanks zane for your help. i am going to try that torch this weekend



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bombing range 8n

01-16-2001 19:48:14




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 Re: Re: intake leak ??? in reply to ZANE, 01-16-2001 04:19:04  
THANKS ZANE
I dont know for sure that both carbs are good. I tried to rebuild the one on the tractor, and i bought a new one at TSC. Both carbs did about the same thing,except the new carb needed a little choke to get started. when i stated cold starts i should have said the first start. SC does not know about cold weather. once it is started the tractor runs pretty good, a little stumble when taking off or fast twist of the throttle. Back to the old carb, on the first crank if you touched the choke it will flood. but wait a little while and hold trottle closed by hand on carb it will sooner or later crank, but acts flooded. Old carb is a 33 and the new one is a 241, if that matters? Thanks for the help...

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