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Discussion Starter #1
Well i have a 05 600rr and im noticing a odd acceleration with my bike...when on full throttle or atleast close to it seems the bike accelerates and then drops off a bit and lags at 9k rpm and then again at 12 and then its fine..so it pulls, lags and then pulls and lags and then pulls...is this normal...or could it be another issue.

The bike is stock other then a yoshi slipon and there is no map done on it.
 

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Does it make any odd noises at those points? The secondary injectors kick in around 7k so it doesn't sound like a clogged secondary affecting performance. Does the engine sputter at those points or does it just lag off a split second then surge up the rpms?
 
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Does it make any odd noises at those points? The secondary injectors kick in around 7k so it doesn't sound like a clogged secondary affecting performance. Does the engine sputter at those points or does it just lag off a split second then surge up the rpms?
or at 5500 RPM @ >50* throttle app...

but i'd be interested to know how exactly it lags as well... if it's just a dead spot or it actually bucks.
 

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I couldn't remember off the top of my head exactly when the secondaries openned - knew they were open above 7k on the tach tho, long before the observed lag at 9k

edit - forgot to say originally too - lag at those points is not normal, should pull cleanly and hard north of 7k clear to redline (as long as you aren't already doing 135+)
 

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Discussion Starter #5
It doesnt buck persay..it just lags a touch and then surges i guess is a good word to use...its not a inear pull what so ever. It seems to be around 9000rpm and 12000 rpm.
 

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Discussion Starter #7
umm i bought it in canada? So not the cali version..
 

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Does the engine sound like it's combusting smoothly at those points or does it sound like it misses a stroke momentarily?

Thinking maybe you've got a slightly fouled plug or 2 - still a bit stumped on this one tho so I'm educationally guessing at this point
 

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Discussion Starter #9
Hmm its so hard to explain...sometimes it just lags for a second and then times like today it fell on its face so hard it was like i let the gas off and then i let the gas off and got into it again and it was fine for the short burst.

If it helps the bike was in a accident before i bought it..
 

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Maybe a pinched fuel line (if the bike was in an accident, this could have happened during reassembly) or blocked air filter?
 

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quite fix: buy a new bike...

j/k

if you down shift at the 9000 does it still feel less powerful or it is just the gear you are in?
 

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Have you messed with the exhaust valve at all? That's exactly what happened to me when I disconnected the servo but didn't have it secured right.
 

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Hmm its so hard to explain...sometimes it just lags for a second and then times like today it fell on its face so hard it was like i let the gas off and then i let the gas off and got into it again and it was fine for the short burst.

If it helps the bike was in a accident before i bought it..
Have you ever had the tank out to check the throttle bodies and velocity stacks - might have a crack in one, that would give you oddball behaviour
 

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Discussion Starter #14
No i havent..i changed the air filter but didnt pay that much attention to the velocity stacks..the accident was minimal and really just rashed the plastics mostly...

I have been playing with it over the past couple days and it feels like its mis firing to me....now its just dying and sputtering.

The bike has 24,000km so im starting to think maybe its just the plugs have lived thier life
 

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fuel pump....do a search. Very common. My street bike(03) went out last year with the exact symptoms you stated, and yesterday my trackbike(04) went out.
 

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Discussion Starter #16
fuel pump?? why would it work fine though at most rpms? and even at 14k it seems ok..Its just if you can get it there..
 

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I'd go with checking the plugs first - at 24k they might be a bit dirty or fouled - either way it'll tell you something about what's been thru the ignition chamber...
 

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Discussion Starter #18
Yup..im changing the plugs and i am going to take the pump out and see if the fuel screen is plugged..then ill take it for a rip and see if that fixes it..if not ill change the fuel pump.

Ill keep everyone posted..phil
 

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Discussion Starter #19
Well i got the plugs pulled to put some new ones in..they look ok but they are looking like it was maybe not the worst thing to change. Sorry for the bad pics but its hard to get good ones so close to show the color..

 

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Color looks Ok (hard to see like you said) any part of the cathode or annode missing (divot,pit, etc)? btw I would think if the screen on the fuel pump was clogged it wound't be so predictable rpm wise it would be much more random as to when you got the lag/launch behavior
 
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