Honda CBR600RR 2003 Bouncy Idle When Held at 5500 rpm only

[ian505050]

Hi,

I am hoping someone on here can offer some assistance with a problem that i have with a CBR600RR 2003 that i recently bought and refurbished.

The previous owner rode the bike to my house and i basically stripped it to a frame, engine and wheels as i noticed many nuts and bolts were loose on the bike after it had been delivered.

I went over the bike with a fine tooth comb as i found brake disc bolts loose, the nose cone had 1 loose bolt holding it together and when the guy was riding the bike to my house the nose wobbled up and down about 3 inch.


Anyway...

After rebuilding i took the bike for a test ride to look for faults or areas for improvement.


My main issue is that the bike has a bouncy revs sat at 5500rpm only.

It pulls through the revs fine but its not possible to hold the revs at 5500 rpm weather the engine is hot or cold. This makes it difficult to ride when going round a sweeping corner as it unsettles the front end as it feels like you are constantly on and off the throttle slightly.

After a little research the honda workshop/tecnical mnual states that at 5500 rpm is when a second set of injectors kick in which matches the rpm when i have my issue. mmmmmmmmm....

I think the previous owner failed to mention the fault which is not a problem as i assume buying a bike private is going to have issues half the time anyway.... so sold as seen etc....


Oh.... just to confirm the bike rides perfectly fine apart from this, does not back fire and idles perfectly. Its got 20k on the clocks and service history is unknown.

A few snaps... to follow

[Pete.]

How can you have any sort of idle at 5500rpm?
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[ian505050]

I used the wrong word, it will not rev smooth at 5500 rpm

[MarJay]

All the emissions/noise tests are done at 5500rpm...

Does it have an aftermarket exhaust? Aftermarket air filter? Any other engine mods?
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[Fizzer Thou]

Balance the butterfly valves after checking the valve clearances and spark plugs.
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Just talk bikes.What else is there?

Always have a 'Plan B'

[ian505050]

[ian505050]

[orac]

is the ECU throwing any code that may shed light, I presume all the injectors are working correctly?
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Current rides - 2016 Triumph Street Triple Rx, 1994 Suzuki Bandit 400 VM, TGB 204 Classic 125cc
"with nothing left to lose, there is everything to gain. It's not the size of the dog in the fight, it's the size of the fight in the dog"

[ian505050]