i can understand peoples concern about these single ring pistons however ive now completed 900miles with mine. im gonna replace the ring and little end as a matter of course at a 1000 miles. my bike has some massive ports, race cans with mc21 front pipes and foam filters. it made 67hp which aint bad. im gonna try a thinner base gasket and get another run done.
the piston goes straight in and is compatable with the barrel (wiseco's words)
its slightly lighter than f3 piston
£20 cheaper than standard piston kit.

so as far as i can see there no disadvantages as long as you dont mind swaping rings abit more often (there only £7)

everybody would like the hrc kit, and i know a few of you guys have it but to us mere mortals rm kits are the way forward!!
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wadda ya mean its too fast!