Question about 1997 Honda CBR 1100 XX Super blackbird

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1997 cbr1100xx, slight hesitation of throttle response at higher rpms & speed. The bike only has 6900 original miles on it! It pulls like a beast up until about 9000 rpm range and then it acts like it's not getting gas just for a split second

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Hi and welcome to FixYa,

Offhand, I am tempted to suspect a small airleak (not a vacuum leak). This could be on:

  • any of the rubber couplings from the airbox to the air intake, loose, mis-aligned or detached;
  • a torn air filter/cleaner or unevenly fitted;
  • the upper half of the airbox loose, mis-aligned or not fitted properly;
  • in some instances, this could be brought about by aftermarket air filters such as those by K&N without a rejetting/tuning done.
Good luck and thank you for using FixYa.

Posted on Feb 22, 2009

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hi Corey !i ahve worked as a motorbike mechanic for 6 years !so the easiest thinks to check is your fuel filter as you said,the spark plugs are a very essential thing to cause such anomalys and of course ,the purity of your gasoline because it may be watered or blemished.also your coils may be malfunctioning.

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The following discussion is based on the assumption that you are trying make the bike go faster than the factory original specifications. I did not see anything in the manual resembling a speed governor, so i assume the limits are set by the engine and transmission parameters. Aerodynamic drag increases as the square of the speed above 20 mph, so anything you can do to reduce drag will significantly cut the power needed at higher speeds.
Probably the most significant limitation to engine output is airflow through the throttle body. Increasing fuel flow at wide-open throttle will only waste fuel on a rich, cooler, dirtier burn. However, there is a maximum amount the cylinder can pull in, so simply installing a larger carburetor may produce only a limited increase in power. Forcing more in (as in supercharging) risks an over-pressure condition and blown engine.
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Speaking of timing, higher power engines will typically advance the spark at higher RPM to ensure combustion pressure starts rising at top dead center. Unless your ignition magneto has a centrifugal stator advance mechanism, your engine probably has fixed timing. Modifying this is a tricky business; if you fire the spark too soon you will lose power and risk damaging the engine with detonation.
The maximum RPM shown on the spec sheet is 5000. Exceeding this can damage the engine; the lubrication system may not be able to keep up with the demand for oil flow, and centrifugal forces may exceed the strength of the metal. If the engine throws a rod at high speed, you could easily get hurt. The only way to go faster than the design speed without exceeding the engine speed limit is to install a transmission with a higher top gear ratio. But if you do this, you may find your brakes are inadequate for emergency stops at this speed.
I suggest you would be better off saving your money for a bike designed for higher speeds rather than risking this one on potentially hazardous and damaging modifications. In some jurisdictions, it is illegal to travel over a certain speed (typically between 25-35 mph) on moped or scooter class vehicles.

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