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After a year or so of sitting, the o-rings are probably shot, so that would be the first thing you'd have to do, rebuild the carb.

Found a few threads on the engine. This one seems pretty lengthy: https://www.rcnitrotalk.com/forum/threads/i-have-the-werks-l-collari-30.27727/ A 10+ year old thread... not sure I'd want to fuss with an engine that old myself.