Mark Have you had the cam timing Checked/done ?
No point spending time and money setting up carburation (Air/fuel), exhaust etc for a badly setup engine.
The Bike will perform best when both cylinders are matched, you don't want one holding the other back.
Some people get lucky and the bike came with half decent cam timing from the factory, others are at the opposite end of the scale where rather than haveing two 290cc cylinders working together they are each doing their own thing. Add in differences in valve clearances, compression ratios (from leakages either past the valve seats or past the rings) etc and you can understand why those that get there engines set up properly end up with more power than those that don't

Mark Have you had the cam timing Checked/done ?
The belts were replaced as part of the service and the valves were adjusted. Think this will need further investigation along with the compression.

As for weight currently concentrated on me rather than the bike. I did contemplate A class but too many of you fast guys in that class.

Many thanks
Mark

Compression can vary between the two cylinders if the cam timing and valve clearances vary between the two cylinders.
If the cam timing has the inlet opening to late then the engine sucks in less mixture than it should so has less to compress.
A leak down Test is a better diagnostic procedure for checking the condition of Valve and piston ring sealing

I'll have a good gauge; bike went in with std bike but cam timing done, 60 hp. Now had same special cam timing ;) but top end overhauled, squish set and 2:1 system.

think some engines are just 'good'. I maintain its how they are ridden when new. Harder the better straight out the crate!!