[AT] Firing on two instead of four

[John Wilkens]

Lew's probably hit it on the head, but have you checked 
compression?  That will let you know if you have some valves 
sticking.  Recently I had a situation that was driving me crazy (not 
your problem though).  'The little Cub I bought had great spark (with 
all wires in the right place), good compression on all 4 and fuel to 
the carb.  But...the Cub would only run roughly on cylinders 3 and 
4--no firing on 1 and 2 at all.  I finally realized that someone had 
bored out the main jet to three times the normal size and the engine 
was flooding.  A new jet solved the problem and the Cub runs great 
now.  I still cannot figure though why two cylinders fired and the 
other 2 didn't.     Good luck!      John



At 04:48 PM 11/25/2006, you wrote:
>Hey,
>    I was playing a short time today with my Case SC which I got at 
> the end of the summer.  It had sat for a few years.  I couldn't get 
> it to fire at first when I picked it up in August, but just put in 
> four new plugs and it ran great.
>    Anyway, lately it has been running on just two cylinders.  So I 
> took the plugs out and cleaned them and laid each individually down 
> and turned the engine over.  Had strong spark in all four.  But 
> still only running on two. Had a new spark plug wire which I tried 
> and still the two would not fire when tractor was running.  Even 
> switched the good wires to the bad plugs and vice-versa....same results.
>    My last test was I pulled the wire to the plugs which were not 
> firing off the distributor cap while the tractor was runnining.  As 
> I held it about 1/2 inch from the distibutor, it arced and 
> fired.  Did the same with the other wire which wasn't 
> firing.  Cleaned the contacts and reconnected the wires.  Same old thing.
>    Suggestions???  Is the distributor bad?  Tried to look close for 
> cracks or wear.  Looking for the next step.
>
>    Thanks.  I don't contribute much anymore, but still lurk.
>
>Tim Nobles
>tnobles at netsync.net
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>Remembering Our Friend Cecil Monson 11-4-2005
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                    In the wide-open spaces of NE Oregon