No spark at 1 & 4 cylinders? Why?

[big bear-apex turbo]

My apex sat over a summer started it a couple times ran fine and then i went to load it up one day and it wouldnt run worth a #*$&@. Got it into my shop and it only has spark on 2 and 3 but no spark on 1 and 4. I bouh brand new iridium plugs for it same as my last set and still nothing i tried closing in the gap and still nothing. The codes come up for no spark on 1 and 4 cylinder as well. Is there a relay or fuse or something or has anyone come across this before?

 

[yamahas]

What code numbers are you getting?

 

[Super Sled]

Maybe not run it long enough those times you fired sled up and foul your plugs? Or else any possibility of mice chewing on wires?

 

[big bear-apex turbo]

33, 36, 81. I understand 81 is just grip warmer it hasnt been working for a long time but 33 and 36 are cylinder 1 and 4 short curcit or something? I removed the coil harnes and checked it (continuity) and it seems fine also i cleaned every electrical plug on the machine. It has brand new spark plugs which didnt make a differance (ive had tbe fouled plug problem before)

 

[big bear-apex turbo]

And its not the coils because i swapped coils and still doesnt spark on 1 and 4 but 2 and 3 have good spark

 

[kinger]

Probably bad battery.

 

[Sled Dog]

Seems to me like its not getting the timing pulse from the engine to send to the coil for half of the engine.

 

[Crewchief47]

Aren't the grounding plugs on these a problem as well???

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