I agree with that above and I`d like to add that my boys are all tall , most players at CPPS have seen my youngest one playing with the Care Bears, he stands at 6` 11", with me being into bikes all my life he showed an interest in bikes also, the only bike that I could get him on as a learner was a KTM , they sit Taller than the rest, maybe give those a go, see what you think, at the moment I have a Scooter .. 650cc , I`ve had about 100 x motor bikes and about 100 x scooters, I was also the Chairman of the Sussex Lambretta Club and Vespa Club and raced Lambretta`s with sidecars down at Liddon in Kent up to 125 miles per hour ( modified engines ) 750 barrel and pistons. that was then ?? I think at the moment Racing scooters can reach speeds of up to 143 miles per hour, any bike can be modified to allow more speeds, Just don`t get Caught !!! with the Mods and the Rockers in the 60`s I learnt FAST, Great fun !!!
HOWEVER AS FROM JANUARY 2013 ALL RULES ON BIKES and your LICENCE IS ABOUT TO CHANGE.