wtb garelli rear sprocket...size?

OK gurus, tell me what size rear sprocket I should be running.

70cc polini, delorto 19, simonini circuit pipe, z11 front sprocket, stock? 36 rear. Seems to be running really hot at high speeds/rpms. If you have one or know where I can get one would help also. Feel free to move this thread to repair or performance. Thanks.

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