9n cold starting troubles

ffinmich · Feb 20, 2021

Hello, I have a 9n, 12 volt conversion.
It always runs great. Now lately when
it's cold it won't start. Only way to
get it started is to pull start it. Then
it runs fine. I can turn it off and it
will start easy then. But if I let it
sit and get cold won't start and gave to
pull start. Any ideas. Thanks

wsmm · Feb 20, 2021

My 2N is almost impossible to start in cold weather, wouldn't start yesterday. Put a halogen light, 500 watt I believe, on a milk case an put it close to and shining on the carb and manifold. Left it on for an hour or two. Went out turned on the gas, ignition off, pressed the starter button and let it turn over 1 or 2 times. Turned the key on, about 1/4 throttle and pressed the starter button. Started right up with no choke and ran fine,

showcrop · Feb 21, 2021

You need a much richer mixture when it is cold. Take a spark plug reading to find out exactly where you are.

jimtrs · Feb 21, 2021

(quoted from post at 19:35:10 02/20/21) Hello, I have a 9n, 12 volt conversion.
It always runs great. Now lately when
it's cold it won't start. Only way to
get it started is to pull start it. Then
it runs fine. I can turn it off and it
will start easy then. But if I let it
sit and get cold won't start and gave to
pull start. Any ideas. Thanks

ff,

Pull starting always starts a tractor easier. The engine turns over faster and longer without any power drag from starter. Things warm up, loosen up. The engine doesn't flood as easily. One of the many many reasons your having trouble could be you got a worn out engine with low compression.

But it is extremely difficult to diagnose your problem without more info regarding so many variables.

Have you reviewed the recent plethora of posts regarding exactly this problem lately? Lots of info there.

If you haven't read the previous posts, or if you have, provide some info regarding some of the points made there. Especially Bruce's detailed reply in the first message I linked to. Then hopefully we can help you.

In just the last page and a half of posts:

..... 2N refusing or hard to start again

..... Why are 2Ns so hard to start in cold weather

..... My 8N

..... 48'...8N Won't start..

Den N Ms · Feb 21, 2021

Ffinmich,You can try a trick I use to get a N started in cold weather.

#1 be sure battery is fully charged up.
#2 depress or block clutch petal down transmission in neutral when cranking over.
#3 Be sure you have no gas leaks.
#4 Heat intake manifold with a good propane torch (not carburetor) moving torch over intake manifold back and forth
for 2-3 minutes until it is good and warm.
#5 quickly turn on fuel,throttle 1/4 to 1/2 way pull choke .turn engine over 2 times,push in choke ,turn on ignition switch and start.
#6 Once started be ready to feather the choke if needed to stay running until it is warmed up
This always works fo me unless something else is wrong.

ffinmich · Feb 21, 2021

Hi, thanks for all the replys. Checked spark, looks ok.took screw out of bottom of carburetor and looks like good fuel flow . battery fully charged. I even tried spraying starting fluid in the intake. And it won't even spuuter.plugs look dry. Any ideas. Thanks

HarryVanderpool · Feb 21, 2021

jimtrs said it perfectly: "One of the many many reasons you're having trouble could be you have a worn out engine with low compression."
Our N's are so darn dependable; we just expect them to go forever.
Spending some time conducting a compression test series can go a long way in diagnosis.
With even, high compression, a fresh carb and distributor service, your 9N will pop right off as designed, assuming your electrical and fuel systems are functional.
No other monkey-motion is required.

Indiana Ken · Feb 21, 2021

You stated you checked the spark and it was good. How did you check the spark? Since it is not starting on cold days, cranking over with the starter, that is when/how you need to verify you have spark. Also, all the spark plugs must be in the engine to put load on the starter/battery same as when you actually attempt starting.

Sometimes with 12 volt conversions the coil and ballast resistor is not matched properly. In this case, you can have 12 volts to spin the engine briskly but the ignition is weak. Cold weather and cranking simply lowers the battery voltage enough, allowing the problem to show up in the ignition system. If this is the case, then the engine should pop right off when pulling the tractor.

duey · Feb 21, 2021

MANY years ago Dad would often get the old 2N to start by pouring a teakettle of scalding water over the carb and intake manifold...anything to get the fuel to vaporize and ignite better. Of course the clutch was held down as well, just one less load for the starter to bear..... Many is the time when the clutch had to be carefully let out after it was running... I suppose it was 90wt... pretty stiff in central Minnesota cold.

showcrop · Feb 22, 2021

Dry plugs means it is not getting adequate gas. When cold the fuel air mixture needs to be stronger. This is why you have a choke.

9n cold starting troubles

ffinmich

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wsmm

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showcrop

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jimtrs

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Den N Ms

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ffinmich

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HarryVanderpool

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Indiana Ken

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duey

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showcrop

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