Hi, my bike only seems to rev up to 3000 revs and splutter really bad at full throttle. I have adjusted the tappets once and the revs were alot better but no getting near the red line. after one ride the revs were dropping very quickly back down to 3000 again and then eventually the engine would struggle to start. I think tappets have moved again or is this a fuel issue? I'm new to fuel injection. Any suggestions?. Thank you.