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Aha! Turns out I had two sized 90 jets and two sized 88 jets in the carbs :/ no idea why someone did that bit I've changed them for all sized 90 jets now from my other carbs do you know what the standard size is supposed to be for them?
And thank you very much for your help banner001, it's very much appreciated!

Ross 46- I don't really know but one thing that pops to mind is if the electrical connection from the speedo is broken then it goes to a default 10000rpm rev limiter. Although yours is about 12500rpm you could just check its all connected the the loom properly? Sorry I can't really offer much more than that

Thanks anyway, will have a look and in return main jet- 90 (92, 95, 98 and 100 also used, out of the manual,