Motorcycle Forum / General / Sportbikes / May 2007

I think I've bumped into a rev limiter somewhere near 15K on my 2002. That
bike just loves revs, no doubt about it. It doesn't even wake up till
6-7-8K.

    Yes, it takes some getting used to, but you can't overrev the
engine, it won't let you.

    It wouldn't hurt to replace all of those

Reassembler

You're really not describing a problem here. Be more precise. Your GSXR
engine would be OK at 16K RPM, the piston speed at 14K isn't even close to
the 5000 feet per minute where problems from piston ring acceleration start.

All GSXR's are like that because they are inline-4's with 4-into-1 exhausts
systems that cause a valley in the torque curve from 5K to about 8K. There is
only so much a port time fuel injection system can do to overcome the reverse
flow of air through the open valves during the overlap period.

The whole idea of the fuel injection system is to give the engine ONE squirt
of fuel, for so many milliseconds only when it needs it. This makes the
engine run leaner than a carbureted engine.

If anything goes wrong with fuel injection, the engine will lean surge.

Maybe your engine is lean surging. Does the whole bike start jerking around
6000 RPM and act like it wants to go faster, but immediately slows down?
That's lean surging.

Have you checked your throttle position sensor? Your fuel injection system
doesn't know to go to rich
if the switch doesn't work.

You'd better never accumulate very much carbon in your combustion chambers.
The capacity is only 17ccs, and the pistons are almost hitting the cylinder
head. Where would the valves go if you had a lot of carbon from, say, leaky
valve guide oil seals on the valve heads and piston tops.

Are the symptoms worse on hot days? That indicates a lean mixture.

Yes. The gas filter can cause a lot of problems in a fuel injection system.

Jebus, man twist that throttle.
It should *really* wake up around 10K!

Dave, For a 2000 your symtoms may be semi-normal but I think you
should have a smoother low and mid range. And yes these bikes don't
come into the REAL power until over 7K RPM. My 03 GSXR 1000 was
torque'y down to 3K and smooth until over 7K then it turned into an
Wolverine and took a slow hand to keep the front wheel on the ground
in the first 3 gears. I think you need to tune that 750 up. Doesn't a
2000 still has carbs? I'd start there and bebuild them; also change
the air cleaner & tighten any slack in the throttle cables.

7,000?? Man my R6 rarely sees less than 10,000!!

Stop pussying that throttle and REV THAT BITCH UP!

That's what it is made for!

The engine isn't telling you "shift up" it is telling you "REV UP!"

All other posts considered, maybe that isn't the best bike for you.
Sounds like its intended purpose is a race track.
I just cant imagine having to keep a bike pinned above 8,000 rpm
for street riding. That is pure suicide. C'mon were talking about
a 750 here, not a 50cc scooter.

I'll make a suggestion being this is your first street bike:
Dump the GSX-R and get a YZF600R.
You'll get a great handling bike that's comfortable,reliable and
doesn't need to be revved into the stratosphere to run properly.
It has a decent low power band and with a 13,500 red line you
still have plenty of top end balls when necessary.

Riding that GSX-R with the rev the piss out of it advice is gonna
get you killed. Lets be real, any 600cc plus sportbike above 8,000
rpm in first gear is fast approaching breaking every speed law in
the US. And you still have 5 more gears???

It's ultimately your call. I just hate to see someone get fuckin wasted
by having the WRONG machine for the job and by listening to BAD
advice.