Wonder if you can help me.

We have a Rotax 503 engine fitted in a Hovercraft, with a single CDI nippo-denso ignition. We want to check / set the timing. The engine is throwing fuel out of the carbs (twin carb system) above half throttle. Suspected this might be a timing issue but struggling to find any information about the above ignition system fitted to this engine. Can anyone give any advice / diagrams to assist?
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