i've been having quite a few issues which i'd like to get some clarity on.
shes an ex track bike, been pushed hard with around 35000 on the clock. ive replaced the battery and spark plugs, as well as some other odds and ends. will do more as time and money permits, but a few days ago i was riding on an uphill when the engine suddenly died - nearly wiped out completely. Seems like she was overheating, but there was plenty water in the radiator and coolant tank - had only been riding for a short while. she then would start and die if taken over 5000 odd revs - seemed to be running on only one cylinder. i got her home and looked her over - the plugs are fine, so are the battery and coils. she now starts first kick but only revs to about 6000, still feels like only one cylinder. Any suggestions as to what the problems may be and how to rectify them? i'm a complete newbie at this so any details would be greatly appreciated, thanks.