nickclayton
stranger
Reged: 12/04/2009
Posts: 2
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Hi all i have a 1998 cbr 600 fw. Which runs fine except that when im in 4th or 5th gear i have a flat spot between 6000 and 7000 rpm and in 6th gear between 6000 and 7500. There are no mods on the bike and it runs fine before and after and in lower gears. Is this a common problem and is there anything i can do about it. Any info would be much appreciated cheers Nick 
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chappers
Carpal \'Tunnel
Reged: 31/12/2006
Posts: 6701
Loc: Mind your own business
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Is it STD?
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Say what you think and think what you say.
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nickclayton
stranger
Reged: 12/04/2009
Posts: 2
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yeh its all std
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chappers
Carpal \'Tunnel
Reged: 31/12/2006
Posts: 6701
Loc: Mind your own business
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Could be the tuning from the factory it could be to pass emmisions and noise tests. If not check your air filter.
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Say what you think and think what you say.
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BigHam
veteran
Reged: 12/11/2006
Posts: 1420
Loc: Letchworth, UK
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They all do that sir.
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Where there's a will and Gaffa Tape there's a way!
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cbreddie
newbie
Reged: 21/05/2009
Posts: 47
Loc: Rochdale, Lancashire
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I ride a 1998 cbr600fw aswell, mine does not have a flat spot, it just pulls like a train right through the rev range, from about 4500rpm. Mine is standard apart from K&N air filter. My old Cbr600fm had a similar problem, it turned out to be crap in the carbs, after cleaning the carbs and running on a tank with redex, it was fine.
Air filter would be my starting place tho
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Only worry about the things you can change, never worry about the things you cant!!
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