My guess was wrong. Came from an XR100. Sorted it this weekend. Been having problems with clogged jets in all sorts of engines. Been told today's gasoline with 10% ethanol is the cause. That only "fresh" gasoline should be used. Am thinking of using VP C12 for term storage in engines used infrequently. Some carbies are just too difficult to drain.
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MC21R9N track
MC18R2J track
CBR954
CR250