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?
  • Re: Rotax 503 Ignition Timing

    by » 8 years ago


    Go to the top of the page and click on manuals under the support tab. You can download the installation, owners, and maintenance manuals for the 503. They will give you everything you need to tune that engine.


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