Now WTF!?!?

CBR Forum Classifieds News Photo Gallery Search Member List Timeslips Contact Sponsors Register Login

Now WTF!?!?

Printable Version

CBR Forum >> Past CBR Models >> CBR 600F2 >> Now WTF!?!?

Page: [1]

Message

<< Older Topic Newer Topic >>

Now WTF!?!? - 5/11/2008 8:41:12 PM

benjiboy

Posts: 43
Joined: 12/13/2007
Status: offline

After changing the plugs due to some occasionaly low RPM hesitation and sputtering the bike won't rev past 10-11k!!! I have no clue what could be going on here. I also changed to an APE manual cam chain tensioner but this has to be fuel or spark, right?

What could be going on here? Someone mentioned the petcock might be bad...?

Post #: 1

RE: Now WTF!?!? - 5/11/2008 8:45:38 PM

lonewolfcbr

Posts: 191
Joined: 3/23/2008
Status: offline

Plug wires??? And did you gap the plugs right? My NGK's came pre'gapped

(in reply to benjiboy)

Post #: 2

RE: Now WTF!?!? - 5/11/2008 8:59:53 PM

benjiboy

Posts: 43
Joined: 12/13/2007
Status: offline

Yea I guess it could possibly be the wires, CDI box, coils, something in the carbs, petcock, or bad plugs but it did not do this at high RPM before I changed the plugs, removed the airbox and sprayed a very little bit of carb cleaner in each carb, and installed that cam chain tensioner.

Plugs are gapped to .035, maybe I'll try like .030 or something? The only thing I can think of is this petcock but I took it apart tonight and saw nothing strange...

While is doesn't run perfect, at lower RPM's it seems to be just fine.

(in reply to lonewolfcbr)

Post #: 3

RE: Now WTF!?!? - 5/12/2008 3:57:52 AM

lonewolfcbr

Posts: 191
Joined: 3/23/2008
Status: offline

.35 Is where its supposed to be your not wrong on that one. When the bike doesn't go past 10-11k...what does it sound like? If the petcock is bad i would imagine you would have worse fuel problems...but what most have suggested is that you take the petcock apart..and lightly clean it before putting it back together....some have said problems have disappeared for them after doing so

(in reply to benjiboy)

Post #: 4

RE: Now WTF!?!? - 5/12/2008 4:57:52 AM

tazshido

Posts: 110
Joined: 1/16/2008
Status: offline

Get a clean container to hold gasoline and make an adapter to connect the conntainer directly to your fuel hose going into the engine (after removing your tank of course). In your garage run the motor that way with absolutely NO restriction in fuel delivery. If she runs better that way then look at fuel delivery problems. If not then you can move on to toubleshooting other things. I've learned the hard/expensive way to check everything you can from cheapest/easiest on up to the expensive/hard stuff. Don't waste your money and energy fixing things that aren't broke. MAKE SURE that what you're fixing needs to be fixed.

_____________________________

Est non aevum , est loginquitas!
Tazshido

1994 CBR600F2 (Running and nearing completion)
1983 XV920MK Midnight Virago (custom cruiser project)
2005 Chinese Tank Urban Touring 250 Scooter (wife's)

(in reply to lonewolfcbr)

Post #: 5

RE: Now WTF!?!? - 5/12/2008 7:45:06 AM

benjiboy

Posts: 43
Joined: 12/13/2007
Status: offline

Yea I took the petcock apart already and put it back on with no significant change. I planned to just remove the diaphram inside the petcock altogether and run it that way to see if that is the culprit...I mean the thing is extremely simple!!!

If I were to hook up a seperate fuel tank like mentioned above what should I do with the vacuum reference line from the #1 carb to the petcock?

(in reply to tazshido)

Post #: 6

RE: Now WTF!?!? - 5/12/2008 9:19:57 AM

benjiboy

Posts: 43
Joined: 12/13/2007
Status: offline

Got it! At least for now...
Either the fuel line was pinched (more likely) or the air filter was too oily. I'll have to track down a new line since putting the fuel on/off/res valve where it needs to be in relation to the fairing pinches the line. Right now the air filter is still off (I did both of those at once which isn't good for diagnosis) but it does seem a bit too oily (UNI filter very similar to a K&N).

Thanks for everyones help and support, I really appreciate it!!

On to the clutch... :(

(in reply to benjiboy)

Post #: 7

RE: Now WTF!?!? - 5/12/2008 12:44:54 PM

lonewolfcbr

Posts: 191
Joined: 3/23/2008
Status: offline

Your having clutch problems too?! Damn man....good luck

(in reply to benjiboy)

Post #: 8

RE: Now WTF!?!? - 5/12/2008 7:09:18 PM

benjiboy

Posts: 43
Joined: 12/13/2007
Status: offline

Yea clutch slips at about 11k. Got the plates jsut need to get the oil, filter, locknut, and gasket and hopefully it goes smoother than everything else...

Thanks for the luck, I'm sure I'll need it.

(in reply to lonewolfcbr)

Post #: 9

RE: Now WTF!?!? - 5/13/2008 3:24:08 AM

rider0033

Posts: 430
Joined: 1/21/2008
Status: offline

quote:

ORIGINAL: tazshido
I've learned the hard/expensive way to check everything you can from cheapest/easiest on up to the expensive/hard stuff. Don't waste your money and energy fixing things that aren't broke. MAKE SURE that what you're fixing needs to be fixed.