Cbr f1 87 running problem
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Cbr f1 87 running problem
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
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
Senior Member
Joined: Apr 2012
Posts: 229
Likes: 0
From: Sheffield, England
Hi mate
There are guys on here who can give better advice than me but I would be tempted to: take it for a run and get the bike to make the same issue. Then take a roadside reading of the temperature (using a cheap infrared thermometer) of each exhaust header at the start of the first bend. The coolest header might indicate the carb/cylinder that isn't supplying the most fuel/working as hard. Then back at home check that carb thoroughly for cleanliness: jets, float height, needle valve condition, diaphragm and so on. Also you might check the ignition system for that cylinder.
Just an idea or two, like I say others on here will advise you better.
Hope you find a solution and if you do let us all know.
Safe riding
Roger
There are guys on here who can give better advice than me but I would be tempted to: take it for a run and get the bike to make the same issue. Then take a roadside reading of the temperature (using a cheap infrared thermometer) of each exhaust header at the start of the first bend. The coolest header might indicate the carb/cylinder that isn't supplying the most fuel/working as hard. Then back at home check that carb thoroughly for cleanliness: jets, float height, needle valve condition, diaphragm and so on. Also you might check the ignition system for that cylinder.
Just an idea or two, like I say others on here will advise you better.
Hope you find a solution and if you do let us all know.
Safe riding
Roger
Admin Emeritus & MVN
Joined: Jan 2000
Posts: 6,908
Likes: 3
From: Conyers, GA
Keep in mind the interior cylinders tend to run a bit warmer so a small temp swing with outer pipes cooler is normal. If your carb drops out altogether you'll get a substantially cooler pipe but if the carb just has restricted flow it can actually run much hotter. A lean condition can run very hot.
Senior Member
Joined: Apr 2012
Posts: 229
Likes: 0
From: Sheffield, England
That's good thinking chainstretcher about a lean air fuel mix making a cylinder run hotter. Something I don't know but would like to - if you have our bike with everything working correctly, how much hotter the middle cylinders are at optimum running temp compared to the outer ones?
Admin Emeritus & MVN
Joined: Jan 2000
Posts: 6,908
Likes: 3
From: Conyers, GA
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