Yesterday afternoon I had my 1990 Honda CBR600F dynoed at the local Honda dealership for one of their summer sale parties. Here is the information regarding my bike:

YEAR: 1990
MILEAGE: 25,800

MODS: K&N filter
Yoshi header pipe with V&H SS2-R muffler
Factory Pro 6 degree ignition advancer

GEARING: stock gearing (44/15)

JETTING:Stock pilots (38s) at 2-3/4 out
Dynojet needles with shims set at stage 2 position (4th clip down)
Keihin 110 mainjets (stock jets)

RESULTS: RUN 1
79.35 degrees F
29.21 in-Hg
humidity 24%
SAE 1.01
Max Power 55.07 HP
Max Speed (4th gear) 105.00 MPH

RESULTS: Run 2
80.69 degrees F
29.21 in-Hg
humidity 25%
SAE 1.02
Max power 56.74 HP
Max speed (4th gear) 106.37

I'm a little dissapointed with the results because I would have guessed that it would have been up around 60-70 rear wheel hoespower. Instead it was dynoed at about 57 RWHP. The guysrunning the dyno said for a bike being 18 years old having 25,000 miles that was pretty good. This the first time I have even seen a dyno in action so I was pretty exited see my bike strapped on top. What are some of your thoughts about my runs? I would of thought the exhaust and advancer would of helped out a bit?

EDIT: Today our airport runway was converted to an NHRA style drag strip for the afternoon.
Here were the results in fastest to slowest.
E/T R/T
1. 14.013 1.016
2. 14.0651.047
3. 14.125 .749
4. 14.143 1.072
5. 14.162 1.183
6. 14.166 1.092
7. 14.1911.280
8. 14.317 1.264
9. 14.368 1.232
10. 14.490 1.074
11.14.55 N/A
12. 14.610 1.279

 

I recall also that it seemed to accelerate quicker down the track when I wasn't holding the thottle wide open but instead starting at 1/2 throttle and raising it as the rpms grew after hitting the next gear? What is that indication of richness or leaness?

 

IMO too rich in the center of the curve. If you full-throttle it and it bogs a little in the middle, but it's fine up top then you're too rich. You could maybe move UP a notch on the clip and see what happens, that will lean it out in the middle - 6-8 or 9k rpm.

But as you know, especially with your bike; I've been wrong before

 

what was the stock rwhp when the 1990 was new ?

 

IDK about rwhp, but its stock was 93.00 HP (67.9 kW) @ 11000 RPM.

 

what octane/heat range plugs. how do your plugs look something is wrong. you wont be able to hang with anything. something is def wrong. looks like you didnt fix your problem. power to weight ratio your bike is slower than a es250

 

Plugs look great and I am running 87 octane.

 

you seriously have to be kidding me right now. you are running 87octane on a +6 advancer......detination central just cuz you cant hear it doesnt mean its not there do a rip shut down the motor right after the rip pull a plug and look at it. i bet you you will see metal particles on that plug.. you are runnin to much timing for that **** octane. hell on my 89 im runnin a +4 i only run 93 and if i feel daring turbo blue i dont trust runnin 87 even when the motor was stock better be safe than sorry.

 

N0, I have no pinging/detonation issues. There are no metal shavings. The spark plugs look fine. Why would you run 93 with a stock bike even when the manual calls for 8 octane? Running higher octane can cause you to lose power if your not tuned for it. Factory Pro reccomends 87. Like I said, there are no pinging issues except for extremely hot days when I am purposly bogging in 6th gear.

 

You may not hear pinging but there is damn sure something wrong with your bike. Detonation is a result of the combustion chamber setting of the explosion before it's supposed to. Advancing the timing FAR enough and yes.......you will detonate. (I dont know 100% that your bike will, but if you go far enough with even a lawn mower it will detonate). Try a higher octane. It's not going to kill you for one tank.
There is also something else wrong with it........I realize a noob rolling a 1/4 mile will not set any records but even half asleep I could run in the mid 12's onmy stock 88 Hurricane.
What are your MPH at the end of the 1/4? That is a good indicator of the HP. 50 is way low.......should be in the high 60's to mid 70's if tuned even semi-ok.

I would also be willing to bet your jetting is way lean even with the new needles. Your main jets are stock? With all that increase in airflow, you need to increase the fuel flow as well. Heat.......(caused by running lean) will also contribute to detonation along with the +6.....it could easily be detonating.

To check the plugs......you need to make a wide open run..and kill the engine. Idling back to the pits will not give you a correct reading. Did you do that?

Do as you please but there is certainly something wrong with it.
Good luck.