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750k1 not starting?

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Arch stanton:
Hello Folks.
I have a problem. That I'm hoping someone could help me with.
My 750 is a very good & willing starter normally but..
Last week it started & ran great.
However. Today I gently washed it with bucket & cloth. No hose.
When I came to start it. Push the button. Engine turns over. But nothing. All is dry in the points case. So I put a test plug in number 4 plug cap. And tried the button again. No spark. But if I arc the points with a screw driver. There is a spark.
Has anyone any ideas what could be wrong?
Your inputs would be greatly appreciated.
Thanks in advance.
Sean.

JamesH:
Dude you wash the handlebars? Wondering if water may have got into the right hand kill switch and cut power to the coils??

Bryanj:
Could just be one of those horrible coincidences, check the points gap and timing

K2-K6:
If you have sparks at points then that verifies the ignition supply side ( switch barrel,  kill switch etc) are OK as you are just testing via the earth route.

If the HT leads are in any way suspect with age or condition,  just try getting someone else to crank it while you look under the tank in the dark, if they are leaking you'll usually see it sparking across somewhere under there.

It only needs to leak on one lead,  for example #4 for it to take out both 1+4 together.

Lobo:
... Sean, is the battery in a good state - ie is the starter motor robbing the coils of power?

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