Jawa 210 Sport does not go past 15mph

My Jawa 210 sport will go right up to 15mph, then quit accelerating.

I have cleaned the carb,

I have changed the spark plug,

(CDI ignition so no points to need replacement or adjustment)

I thought that the exhaust was restricting me, but this is not the case.

It ran fine last summer, and I drained everything over the winter months.

What could be holding me back??

Does it sound like lack of compression? Do I need new rings? wouldn't I have to break them in?

All help is appreciated,

Thanks,

Andy

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