[AT] Super M hard to start

[Howard Pletcher]

Have you used it enough since Thanksgiving to thoroughly flush all the
summer gas?

I had a Cub Low Boy which with its updraft carb was always difficult to get
going even in the summer.  Once it turned cold, it was almost impossible to
get going until I remembered that winter gas vaporizes easier than summer
gas.  After I drained the tank and put in fresh gas, I was surprised it
would start better in the winter than in the summer.

I can't say that is your problem, but it might be worth trying.

Howard


On Wed, Feb 5, 2020 at 8:29 PM Dean Vinson <dean at vinsonfarm.net> wrote:

> My Super M is hard to start in cold weather.   It always does start,
> eventually, but if the weather is cold it’ll take maybe five or six or
> eight attempts, with each one resulting in a few pops or a second or two of
> running before it dies.   I always think I just need to find the right
> amount of choke vs throttle, but I don’t know whether I’m really finding it
> or whether the engine just gets warmed up enough by the repeated attempts
> that finally it settles down and is just plain ready to start.   In warm
> weather it typically fires right up with no hesitation.
>
>
>
> 12 volt battery is well charged, and a few years ago I had the starter
> rewound for 12 volts, so there’s no shortage of cranking power and it turns
> the engine over nice and fast (but not crazy fast like it used to with the
> 12V battery on the original 6-volt starter).
>
>
>
> It does have pretty high compression, resulting I assume from a rebuild
> shortly before I bought the tractor ten years or so ago, and which helps it
> put out about 55 hp on the dyno.  I can’t remember the compression numbers
> right now, but I remember checking compression after buying the tractor and
> thinking “Wow, those are some high numbers, and all four cylinders are just
> about dead-on equal.”   When hot the engine typically diesels at shut-down
> unless I let it sit and idle for several minutes, so I’m wondering if the
> hard cold starting is related.
>
>
>
> Anybody have similar experiences or recommendations?   The other thing I
> was wondering is if maybe the non sequitur is out of adjustment, but I
> can’t find the factory specs for it in the service manual.
>
>
>
> Dean Vinson
>
> Saint Paris, Ohio
>
>
>
>
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