Thanks guys
Billitmotors, please post pics of your engine. I love to see how other people have done it.
Its interesting that you had the best results with a purchased carb. I had the same issue with the single I built.
When I tried running it with a home-made air-bleed type carb it wouldn't go past 7000pm, with a model car carb I got 9700rpm in the end.
Hopper, I am looking forward to getting it in tune and seeing how it stacks up. I will post numbers when I have them.
I did my usual trick of letting my excitement get the better of me and rushing the final assembly.
Now that the dust has settled I have done a bit of much needed inspection and found that one exhaust cam is out by 2 teeth, I'm losing compression in one cylinder due to a combination of the cam follower guides being a little too high thus preventing the cylinder from seating and the head o-ring groove not being deep enough allowing compression loss down the bolt holes as well as finding that my valve clearance is more than 0.2mm which has reduced the valve duration from 270 degrees to 240 degrees.
I have also got a bit of work to do on balancing the crankshaft.
So all in all Im pretty sure there is more performance to be had