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They are ok. I got a 21 and 28 to review and they were pretty good but the didn't last long and seems to be the consensus with this engine and the Ninja (who was made by GRP also).
I strongly suspect that Adam did a whole load of porting and polishing work, he has written a few articles for this in the US, it would explain the run times.
Regards,
Neil.
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Want it just that they stuck in 5-6mm carb restrictors to get the run time?