[Fixed] Will not rev past 8k

[positron]

Thank you for the comments, and apologies for the delay in trying the steps out.

I tilted the tank up and checked the fuel tap and fuel pipe routing. Fully on and pipe not flattened out. I checked the breather pipes (the two things that open up at the bottom of the tank, and they look okay, and they are sitting into a little rubber cup thingee, so I assume they are not blocked. I couldn't try riding with the tank filler cap open as I couldn't get the key out of the tank filler cap when it's not closed (It just occured to me that I could have used my second key... doh, will try that soon).

Air filter was replaced within last six months or so, I don't know about fuel filter though. I don't have these handy, so I will order them in and try changing them. Last week the bike felt really clunky in the front and felt as if there is massive engine braking as soon as I let go off power. Turns out that the front wheel bearing was badly shot. I got that replaced by my mechanic, and it feels better now, but the 6.5k/7k issue is still there. My mechanic reckons it might be carb related, but he can't be sure unless he starts stripping the bike to have a good look (which sounds expensive...)

Thanks again, I'll report back when I have done some more work.