2003 600RR Top End Bog?? - 600RR.net
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post #1 of 6 (permalink) Old 11-16-2016, 11:26 PM Thread Starter
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2003 600RR Top End Bog??

Hey guys! So I recently traded my atv for a 2003 600RR, great bike! I used to have a cbr250r and wow what a world of difference, from a one cylinder to a four! When i got the bike, it had a bit of problems, mostly with sprocket which i fixed but also with engine- low rpms sucked and the idle would fluctuate, almost like a misfire, it would bog in low end and when it reached 5-6k rpm, it would fix itself. So, I had a weekend off from work and I wanted to do a full clean up, so i removed the injectors, cleaned them internally and put new o-rings on it, cleaned KN air filter and reoiled, oil and filter change, new iridum spark plugs and throttle body cleaning and radiator fluid change. So, I go to put everything on my bike and reassemble everything, and my idle problem is fixed and it runs amazing- low end. But now, when I WOT it, it runs fine until it hits the 9k RPM and then it bogs- it still accelerates but you can tell its a huge bog, now if i 3/4 WOT, it runs like a charm. What does this sound like?? Im so confused as i never had this problem before, I thought injectors but there is no leaks?? What can this be, its annoying me and dont want to dissamble stuff without having an idea where to start, someone told me its TPS thats bad, but that coincidence would be crazy since it worked amazing before, im almost thinking its misfiring at high rpm but its so odd since it runs fine otherwise? I also feel like it has bit less power after the rebuild, but it may just be because I got used to it. Please let me know, thanks!
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post #2 of 6 (permalink) Old 11-16-2016, 11:43 PM
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Check gas tank, has rust inside?

Ton of threads about "fuel pump" and "won't pull above XXXrpms" OTF.

use search!
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post #3 of 6 (permalink) Old 11-17-2016, 01:31 AM Thread Starter
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I had gas tank assembly out while cleaning the injectors but when I put it all back it all looked like no rust was there. I just find it odd it did it when I put it back and not before ?
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post #4 of 6 (permalink) Old 11-17-2016, 02:13 AM
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Clean your strainer & fuel filter. Also do a volume test, manual recommends 170cc (min) of fuel in 10sec, any less you're experiencing fuel starvation.


2003 CBR 600RR JDM
HRC ECU AMA spec
HRC radiator
Electrex World race alternator
WP 4618 rear shock
WP 1508 steering damper
Ohlins 9.0N fork springs
Overrev tuned fork cartridges
Akrapovic Evo Carbon FS
Dynojet PCV WB2 POD300
BMC race air filter
AFAM 15/47 sprockets
DID VX2 520 gold chain
Brembo 19RCS MC
HEL brakelines
Euro Racing riser plates & lever
HM Plus quickshifter
EVR CTS slipper clutch
BST CF wheels
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post #5 of 6 (permalink) Old 11-17-2016, 06:00 PM Thread Starter
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Thanks man! You really think that this would cause it to do it even tho it worked fine before??
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post #6 of 6 (permalink) Old 03-13-2017, 09:29 AM
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see https://www.600rr.net/vb/194-engine-t...e-low-rpm.html

Seems like you may have a faulty coil pack.

2005 CBR600RR - bone stock
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