Hi all, I've been a long time lurker on the forum but this is my first post. I've got a 1990 model VFR750 that has a bit of an odd issue. Back last year I was out for a ride and about an hour in it started running really rough, almost like a misfire. A few weeks later I gave it a full service making sure I checked the spark etc and everything seemed ok. After the service it run really well and I've done several rides since lasting up to an hour each and they all went well. This week I went out for a longer ride and after 90 mins the problem came back. It struggles to rev under load, mainly between idle and 5k rpm and then slightly better above this. I can let the bike go cold and try again and the problem is still there. My first thought was an issue with the carbs but in all honestly I don't really know. Any help would be much appreciated. Ps. To top it off, the ignition switch also failed on the last ride so I had to do a temp fix to bypass the ignition switch.