Hey, so ive ran into a wired problem with my cbr600 f1 from 87.
the bike havent run for about 3 months and when i went to try and start it i had no luck, i then clearned out the Karbs as it turned out the person who had it before me had done the same but then use a siliconbased sealing that wasent petrol resistance so the nozzle in the karb was full of said sealing, i then clearned it out.

after i got the bike back togeather i started right up and ran smoot the entire day i was rideing it, now the next day i went to pick it up and drive it home, on my way home it started to run really wired, like it was only running on 2-3 cylinder it had no power, allso notice it got quite hot, so i turned around and drove it back to the garage, i then bleed the cooling system to see if that helped, after i did that it didnt get to hot anymore but it was still running like only 2-3 cylinder, i then had the karbs synchronized and that sort of helped, now it runs really great from 1-5000rpm then from 5-9000 it runs like its missing a cylinder, but from there it runs really great all the way to 13000rpm but in that middle range its really wired.

i really dont know where i should start to try and sort this out so iam hopeing someone here might have an ide what could be wrong.

i know its a wall og text and i do apologize for my english as it aint by first language.

Thanks in advance for any help/advice you might have

 

Thanks for the reply dodger79 i'll try that and see if it works and post here with the result