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Re: spark plug gap
Don't change the setting on the plug. The 400's are happiest when you just plug in new ones and ride. They like NGKs the best. There are two types for the 400. One runs hotter. This choice will depend on which country you live in and what the ambient temperatures are.
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these are dual spark coils. this means that each coil sparks twice on companion cylinders.two leads out of one coil to the two middle cylinders and the two leads out of the other coil go to the two outside cylinders it doesnt matter which coil,but usually one of them has two long leads and the other two shorter leads
Spark plug gap maladjustment will not stop the engine from starting. It will however produce misfiring or rough idle. More than likely, a spark plug cable has stopped making contact. Check the cables for continuity from the coil end, to the spark plug cap end. And also, if the spark plug terminal at the top is making contact with the cap. Check if your plugs are supposed to operate with the bare screw, or the adapter cap.
im not sure if this model has a fuel pump but follow your fuel line and see if it does wen u find it remove black plastic cap and check the points contact breakers are in good conditon ie not worn uneven or worn out and that they open and close.check your air filter spark plugs and your carbs could have a blocked jet so get them cleaned and balanced.
the old petrol has buggered up the jets a good carb cleaning will fix the carbs now drain the old petrol out and get new dont try to mix old and new gas it does no good please give us a rate hope this helps