ypanchia wrote:From a different thread: How full is your tank? whenever i fill mine up a bit of fuel comes out of the two bronze pipes at the rear of the carbs - its not a big deal - as far as i know its just the overflow. i sorted it by closing the petcock ever so slightly.

This indicates that the needle valves in the carbies are not sealing properly.(or possibly the float level is set way out)
This will affect the float levels, and have a serious impact on how well the bike runs.
Possibly,the amount the needle valves leak differs with revs, (vibration frequency) giving you a varying float level?
You say that it won't rev past 6000rpm, this may be because at that frequency the needle valve leaks a lot of petrol and the float level rises to the point of overflow? Maybe not.

Anyway, I would fix this problem first and then see how the bike runs.
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[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...