power loss after half throttle

vidaliaman · Jul 25, 2016

went to pick up my dad's 2n put on new wiring harness, plugs and plug wires, resistor block and cutout, this 2n has not run well
in years, fired right up but is spitting just a little bit however when you throttle over half way it looses power, also may be
an unusual nose coming from the governer at certain rpms, any idea where to start? gas pours out bottom of carb good bright spark

thanks dave

vidaliaman · Jul 25, 2016

i am very interested on feedback for ratface's mystery manifold, i too just installed an aftermarket manifold on the 2n...

ratface · Jul 25, 2016

wouldn't it be something if these manifolds are causing it. Good luck with your issue, I've had loss of power before and it's been fuel related, dirty flow somewhere?

R Geiger · Jul 25, 2016

I would move the throttle to full high end and adjust the carburetor. Always do the simple and cheap things first. Also disconnect the gov arm and run the throttle by hand and see what happens.

Royse · Jul 25, 2016

(quoted from post at 20:34:34 07/25/16) i am very interested on feedback for ratface's mystery manifold, i too just installed an aftermarket manifold on the 2n...

Dave, if ratface has the manifold I posted pictures of, I don't
think it would work on a 9N/2N. It sticks out further than the
originals and I believe the 9N/2N linkage would hang/rub on it.
That is pure speculation on my part, as I didn't try it on one.
But it stands out quite a bit further than the original.
8N linkage is lower and horizontal. Clears it easily.
Pain in the keister to bolt a carb to though. :evil:

When you say gas pours out of the bottom of the carb do you
mean with the plug out? I would certainly hope so!

Did your dad's run right before the manifold replacement?

DGinVT · Jul 25, 2016

Check the interior of the inlet part of the casing to make sure there is no casting slag in that area. If there is noise coming from the governor, open it up and look for rubbing or a worn bearing. There is also a slim chance that the ballast resistor might be changing value due to higher current running thru it while warm. While you are at it, open the carburetor bowl drain and check for a good fuel flow. As R Geiger just said don't spend money until you do a lot of checking.

notjustair · Jul 25, 2016

Also, you might take the pipe that connects the oil bath air filter to the carburetor. There could be an obstruction (like a nest of some kind) causing it to starve for air.

That situation can bring harvest to a halt and take days to figure out. Combines apparently need lots of air to be able to run correctly and have power to thresh. Don't ask how I know.

HFJ · Jul 25, 2016

"Don't ask how I know."

lol. i'm gonna go with "read it in a fortune cookie"

vidaliaman · Jul 26, 2016

his 2n hasn't run well in 3 or 4 years, yes gas running out of bottom with the plug out, was just playing with the carb a little, turned the needle down until it quit then backed it off, continued to run a bit rough until i backed out 7 full turns of the needle, this tractor fires up and goes down road just fine until under load, what is the correct full turns for that needle?(ball park) certainly not 7 full turns, even with it running better at 7 full turns it still looses power at just about half throttle, manifold seems to fit well with no rubbing of linkage and believe it has sealed well, also just did compression test, from seat to radiator, 60 - 80 - 80 - 30, not good! however not sure i got my compression tester to seal because of tight quarters, would you all try the 1 ounce of MMO in each plug hole for a day repeating for 3 days?(read that on YT somewhere, what are your thoughts

dave

HFJ · Jul 26, 2016

dave, everyone seems to say one and a half to two turns out. i've seen it stated, more than once, that if u have to do more than 2 full turns on it, u have something else wrong.

R Geiger · Jul 26, 2016

(quoted from post at 08:32:05 07/26/16) his 2n hasn't run well in 3 or 4 years, yes gas running out of bottom with the plug out, was just playing with the carb a little, turned the needle down until it quit then backed it off, continued to run a bit rough until i backed out 7 full turns of the needle, this tractor fires up and goes down road just fine until under load, what is the correct full turns for that needle?(ball park) certainly not 7 full turns, even with it running better at 7 full turns it still looses power at just about half throttle, manifold seems to fit well with no rubbing of linkage and believe it has sealed well, also just did compression test, from seat to radiator, 60 - 80 - 80 - 30, not good! however not sure i got my compression tester to seal because of tight quarters, would you all try the 1 ounce of MMO in each plug hole for a day repeating for 3 days?(read that on YT somewhere, what are your thoughts

dave

For you chase anymore geese, get some GOOD compression eradings. With what you have you will get the running problems you have.
I start with the needle 2 1/2 turns open from full colsed position and with it running at full throotle I adjust in until the engine just starts to falter then back it out 1/4 turn and then check and see what it does under load. Sometime I will have to back out another 1/16 or so. Usually end up at about the 2 turns out setting, maybe a bit less. 7 turns and you have a problem. Low compression also means low vacuum to pull in fuel.

power loss after half throttle

vidaliaman

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vidaliaman

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ratface

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R Geiger

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Royse

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DGinVT

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notjustair

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HFJ

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vidaliaman

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HFJ

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R Geiger

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