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Discussion Starter #1 (Edited)
Hi there,

recently picked up an '09 cbr600rr with about 11k miles and today I finally stretched its legs to see where it topped out at and only got to an indicated 145, and 146 coming back. Im roughly 6 foot and 230 with gear and was as tucked as I could get while still seeing over the screen. Can weight affect speed that much? I know I'm not the smallest dude but I've seen far bigger guys hauling ass with no trouble. These bikes are supposed to do 160ish.

Bike has fresh oil, and a new air filter. Not sure if its re-geared but 7k rpm is exactly 77mph, and 8k is 90mph.

Does this seem off a bit or am I going crazy? I previously had an Fz-06 that would see 155+ with no issue.
 

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Discussion Starter #3 (Edited)
Count you sprocket teeth. Front would be 16 teeth, and rear would be 42 teeth if they were stock.(which I doubt).
Rear has 42, ill have to check the front tomorrow when I can pull the plastics off. At that 145 its far from redline so the previous owner probably geared it for highway/lower rpm cruising, but then again it should still be able to max out in 5th, which it currently cant.
 

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Something ain't right.

Bike should have no problem hitting redline if geared lower (say 14-15t front).

I cant' believe it's geared higher to the point it won't pull, either.

17t countershaft sprocket is largest available.

What speed is shown at 7k rpm?

on my 09 w/stock gearing (16/42) 7krpm = 77mph.

But , you need to check with an independent speedometer.
 

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Discussion Starter #5 (Edited)
Something ain't right.

Bike should have no problem hitting redline if geared lower (say 14-15t front).

I cant' believe it's geared higher to the point it won't pull, either.

17t countershaft sprocket is largest available.

What speed is shown at 7k rpm?

on my 09 w/stock gearing (16/42) 7krpm = 77mph.

But , you need to check with an independent speedometer.
Yeah I think something is definitely wrong with it. If the stock gearing puts 7k at 77mph then mine has to be stock because that's exactly the indicated speed at 7k. 8k is 90mph. I was riding with a buddy side by side and our speedos were identical, so speedometer inaccuracy is ruled out.

Could the exhaust flapper be stuck closed causing excessive back pressure which is then multiplied with higher rpm?

Edit- forgot to mention that both tires are at 36psi, so low tire pressure is ruled out as well.

Edit 2- Elevation around this area is approximately 4500ft, could that effect power enough to reduce top end by 15mph? At this elevation Im losing about 16hp at the crank. I had a friend on an 08 model hit 160 no problem, but he was about 60lbs lighter.
 

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Oh, you might be hitting the ignition retard at above 11k rpm in sixth.

Do research OTF about DJ IRC (throttle clamp) or Bazzaz Z-Bomb?

if flapper stuck closed, you would get a code.... it should cycle open/closed when Key turned/fuel pump primes.

I run at about 30 psi cold, tire psi not a problem.

Can't say about elevation...... but the 08 you mention revs good, and they do not have the "ignition retard" thing....which may explain what your experiencing.

If it's a flat stretch of road, that weight difference shouldn't affect top speed much.

Accel is affected by weight more than top speed......

Top speed I have seen on speedo is 163 mph, bike was still pulling good......strong tailwind.

2 ways to get around restriction on 09+ bikes.

Fit a 07-8 ecu and do the pin mod. (search OTF)

or what i did.... DJ PC5 and IRC, a good street map on the PC5.

PS Li batt + Arrow full system (SS).....Wet Bike weighs about 375 lbs, rider weight about 180 lbs.
 

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Discussion Starter #7
Oh, do you have this bike completely stock?

you might be hitting the ignition retard at above 11k rpm in sixth.

Do research OTF about DJ IRC (throttle clamp) or Bazzaz Z-Bomb?

if flapper stuck closed, you would get a code.... it should cycle open/closed when Key turned/fuel pump primes.

I run at about 30 psi cold, tire psi not a problem.

Can't say about elevation...... but the 08 you mention revs good, and they do not have the "ignition retard" thing....which may explain what your experiencing.

If it's a flat stretch of road, that weight difference shouldn't affect top speed much.

Accel is affected by weight more than top speed......

Top speed I have seen on speedo is 163 mph, bike was still pulling good......strong tailwind.

Have DJ PC5 and IRC, a good street map on the PC5.

Arrow full system (SS).

Wet Bike weighs about 375 lbs, rider weight about 180 lbs.
The bike is completely stock except a Leo Vince slip on.

I just googled the timing retard and that on top of the elevation is probably whats causing it to fall on its face in the high rpms. Ill order the Bazzaz Z-Bomb and see if that solves the issue.

Thanks for the tips!
 

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Where are you?

I do not think elevation is as much of a factor as you think.....(your friend's 08 runs strong)

I can feel motor elevation sluggishness at above 6-7 K ft, not really noticeable below that elevation.

Get a fuel controller (PC5 for me) and dynotune if you want a solid solution.

Personally, I prefer Dynojet's stuff, they stood behind their warranty for me.
 

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Discussion Starter #9
Where are you?

I do not think elevation is as much of a factor as you think.....(your friend's 08 runs strong)

I can feel motor elevation sluggishness at above 6-7 K ft, not really noticeable below that elevation.

Get a fuel controller (PC5 for me) and dynotune if you want a solid solution.

Personally, I prefer Dynojet's stuff, they stood behind their warranty for me.
Im in El Paso, Tx. 3800ft. Top speed run was at roughly 4500ft. It is true though that his bike hit the 160 mark at this elevation and mine cannot (mods unknown).

Ill be ordering that bazazz z-bomb in the next few days and if that doesn't cure it then Ill be looking at tuning options, I've had previous success with Dynojet so wouldn't mind sticking with them.
 

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Discussion Starter #10
Was out riding around messing with the bike to see if I could find any issues and when revving the bike to a steady rpm and holding it at say 6k with minimal throttle, its completely steady. Doing the same while rolling along in gear with the clutch pulled in the motor bounces between 6-6.5k and sounds as though its got launch control. It does it at any rpm, so starting to think it could be a faulty TPS

Ive been away from bikes for a couple years but it seems to pull just fine otherwise
 

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Discussion Starter #11
Took the bike out for a spin and hit 158, which is in the neighborhood of what it should be able to do. Really not sure what caused it to bog down a few days ago but whatever the case, shes back to normal. Only thing different was the gas used, couple days ago I had filled up at the 7eleven and this fresh tank was Shell V-power. No idea...just really happy theres nothing wrong with it

Thanks for all the input
 

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I've gotten upto 210km/h on the drag stip, probably can still pull more speed as well if the 1/4 mile wasn't so short.
I'm 62kg 170cm.
I was told by DynoJet that my bike didn't require the IRC even though I fitted it. They said it did nothing for me.
 

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Bad fuel can definitely cause issues with bogging.. If you have any inkling that you've gotten bad gas, go get yourself some Seafoam or other fuel treatment product that reduces excess moisture and such..
 

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Discussion Starter #18
I've gotten upto 210km/h on the drag stip, probably can still pull more speed as well if the 1/4 mile wasn't so short.
I'm 62kg 170cm.
I was told by DynoJet that my bike didn't require the IRC even though I fitted it. They said it did nothing for me.
What year is your bike? only 09+ would benefit from an IRC, an even then it may be a wiser choice to go with an 07-08 ecu to avoid having to add fuel at the top end
 

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Discussion Starter #19
Bad fuel can definitely cause issues with bogging.. If you have any inkling that you've gotten bad gas, go get yourself some Seafoam or other fuel treatment product that reduces excess moisture and such..
She runs strong now so it must have been bad fuel. Sticking with only top tier pumps from now on, Shell, Chevron, etc.
 

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Discussion Starter #20
Maybe you were in 5th but thought you were in 6th; not trying to be a ****


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It stopped pulling in 5th, then clicked up to 6th and it just held 145ish. Haven't experienced the issue since and ive been over 150 a couple of times
 
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