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H carb problems its a loooong story

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jason r

06-10-2002 18:53:09




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ok guys here is a stumper. i have been through the archives and can't find anything really related. i just got my 45 H restored. i put a new distributor on it after i removed a live hyd pump, set the points right, installed new plugs and wires. I cleaned the carb reset everything and bolted it on tight. it ran better than ever before. then after i went for a joyride for a couple of miles and came home i went from full throttle to idle and the thing died on me. i removed the carb, cleaned it and reinstalled it. it still wouldn't idle right. it will go full bore and sing a song but it won't idle. so, today i rebuilt the carb, saw my local ih service tech to make sure the carb float etc was ok and the tractor ran just fine for about ten minutes, then it crapped out again. it makes a gurgulling sound when you go from full to idle. i can move the idle jet in and the tractor runs ok but not smooth. if i give it more air it dies. i also checked the plugs and gap and the carb for air leaks and all were a-ok. so guys i hope someone can help me. thanks in advance for the help

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Don L C

06-11-2002 11:31:42




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 Re: H carb problems its a loooong story in reply to jason r, 06-10-2002 18:53:09  
First,every body thinks the idle and main fuel screws "ADJUST AIR" ---not the case....when you turn the screws in and out you are adjusting how much gas can pass thruugh.....
turning the idle mixture screw in,gives it less gas....Take the screw out and make sure you haven't tightened it into the seat to tight and messed up the surface ,check the point....if you see a gruve or a burr, it and the seat must be replaced..... if it looks OK try this ....gently blow air at about 35# into the hole (WATCH YOUR EYES)...now gently put the screwback in...all the way but not tight back screw out one full turn ....start engine and set the throttle at a fast idle.....now set the idle stop on the carb at this fastidle speed.....put hand throttle all the waw back down.....now the engine should be at fast idle.....turn low speed screw slowly in until the engine starts to run rough....back it out until it starts to run rough.....Turn it in and out slowly until the engine runs the, fastes and the smothest..... now adjust the idle speed you want..... ..buy the way ,you adjust the main jet screw the same way.... with the engine at full throttle..... .good luck

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Farmer Bob

06-10-2002 20:56:19




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 Re: H carb problems its a loooong story in reply to jason r, 06-10-2002 18:53:09  
Jason, Another suggestion would be to check the Throttle shaft assembly that sits atop the governor. Sometimes the bushing at the left end of the throttle shaft will wear to the point that the tractor will not hold a decent RPM at idle. We had an H at one time that we would have to loosen up the two cap screws holding the shaft housing to the connecting rod housing and then using a large screw driver, raise up on the shaft housing and then retighten the cap screws. Finally had to replace that bushing.//FB

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Bleedinred

06-10-2002 20:07:32




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 Re: H carb problems its a loooong story in reply to jason r, 06-10-2002 18:53:09  
Jason there have been several cases of similar problems here lately. I would check the fuel flow from the tank mainly to see if you have a lot of gunk in it. Sometimes it helps to put an in line filter after the settling bulb. Possible you are getting flecks of crud in the idle jet, although you mentioned you have cleaned and overhauled the carb. Next I would check the point setting again. Kinda of sounds like an engine with it's points set to wide. I've had bad condensers that cause erratic idle or not even to run. I'm sure you have the distributor on #1 wire with #1 piston up on compression stroke, so that's all I can suggest. Probably not a lot of help. Good luck.

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