bad running

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bad running - 9/18/2008 11:25:07 AM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

hi all can anyone help me please . my 1990 cbr 600 fl keeps bogging down at high revs . its fine going around town but as soon as i get on the open road and open it up it dont want to know . i hav cleaned the cars out changed the filters and plugs with no joy . please help .thanks

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lloydiecbr

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RE: bad running - 9/18/2008 11:42:22 AM

michigan_313

Posts: 705
Joined: 2/24/2006
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what exactly did you do when you cleaned the carbs? did you just hose it down with cleaner or take them apart?

bogging at high revs sounds like floats or needle problem.

(in reply to lloydiecbr)

Post #: 2

RE: bad running - 9/18/2008 1:37:34 PM

Hurricane rider

Posts: 623
Joined: 8/23/2008
Status: online

or a synchronization issue.

(in reply to michigan_313)

Post #: 3

RE: bad running - 9/18/2008 3:09:35 PM

thrasher572

Posts: 430
Joined: 1/5/2008
From: Alberta,Canada.
Status: offline

or starving for fuel... Check your fuel filter, and pump output.

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Post #: 4

RE: bad running - 9/18/2008 11:27:32 PM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

thanks for your reply . i replaced the fuel filter when i cleaned the carbs . how would i check the out put of yhe pump . the pump ticks and pumps fuel at low revs ie tick over . is that normal ?

< Message edited by lloydiecbr -- 9/19/2008 4:48:40 AM >

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lloydiecbr

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RE: bad running - 9/18/2008 11:29:10 PM

lloydiecbr

Posts: 17
Joined: 9/18/2008
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thanks for your reply . im a bit thick what do you mean sink.

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lloydiecbr

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RE: bad running - 9/18/2008 11:33:23 PM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

thank you for your reply . i stripped the the carbs as best i could without getting mixed up . but i did manage to get them clean ie the floots jets and needles and breathers . and still at a loss .

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lloydiecbr

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RE: bad running - 9/19/2008 3:42:45 AM

Hurricane rider

Posts: 623
Joined: 8/23/2008
Status: online

by synching them, I mean basically balancing the air flow to each cylinder. do a search on carburetor synch, you''ll get the idea. I''ve done every single carb rack I''ve owned, some more than once.

(in reply to lloydiecbr)

Post #: 8

RE: bad running - 9/19/2008 4:47:12 AM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

thanks ill give it a try

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lloydiecbr

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Post #: 9

RE: bad running - 9/19/2008 4:56:16 AM

Hurricane rider

Posts: 623
Joined: 8/23/2008
Status: online

no problem, a good carb synch never hurt anything.

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RE: bad running - 9/20/2008 5:19:05 AM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

hi i did a carb synk and checked the fuel pump out put they are fine but still the same thing happends .

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lloydiecbr

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RE: bad running - 9/20/2008 9:39:52 AM

Hurricane rider

Posts: 623
Joined: 8/23/2008
Status: online

how about the clamps on the rubber boots? are they secured properly? I hear if they''re loose it can cause issues.

(in reply to lloydiecbr)

Post #: 12

RE: bad running - 9/20/2008 2:30:09 PM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

i replaced them with new ones a few months ago and they are good and tight. thank you for your reply

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lloydiecbr

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Post #: 13

RE: bad running - 9/20/2008 3:49:12 PM

Hurricane rider

Posts: 623
Joined: 8/23/2008
Status: online

just a thought, have you checked the plug wires and coils? if you''re getting weak spark to a cylinder or two, or more, think about replacing the wires and seeing how much that helps you. bear in mind the bike IS 18 years old, and by now could probably stand to have new plug wires put in.

(in reply to lloydiecbr)

Post #: 14

RE: bad running - 10/11/2008 10:43:21 AM

lloydiecbr

Posts: 17
Joined: 9/18/2008
Status: offline

ive fixed it , i put a fairing on it now it go,s like stink thanks guys

(in reply to Hurricane rider)

Post #: 15