Rev problem? Between 8500 and 11000

[SamVeilleux]

Rev problem? Between 8500 and 11000

09-06-2019, 08:28 AM
Hello everyone!

Im pretty new to motorcycle in general and ever newer for Katana.
I recently bought a 1999 Katana GSXF750.

Bike runs fine, idle is good. Clutch is responsive.

My problem is, on gear 2-3-4 ( could not test 5-6, not going that fast ) i feel like past 8500-9000 up to 11000 rpm I don't have any acceleration or power.
So the bike would do a great acceleration between 0 and 8500rpm, but as soon as I hit pas 8500rpm, Nothing.

I was wondering if its the transmission or clutch, because the powerband feel very linear between 0-8500rpm, and weirdly going flat after.

Is it a normal thing for Katana750 ? Are they setup like? Or do I have a problem?

IM REPOSTING CAUSE NOW IM IN FIXING MODE.

1 - THE ENGINE STILL GOES IN ACCELERATION, YOU CAN HEAR IT RAMP UP
2 - NO GAZ IN OIL AND DID 3 OIL CHANGE SINCE I GOT IT, LESS THEN A YEAR
3 - INSPECTION ON THE CLUTCH AS BEEN MADE, SOME BURN MARK ON THE STEEL PLATE, PADS ON THE FRICTION DISK LOOK GOOD AND IN SPEC(MM) NOT NEW BUT NOT DONE

I installed some aftermarket Clutch lever and brake lever. The ''universal'' one. could it be that the clutch cable is badly adjusted, and when i hit Higher power, since its badly adjusted the clutch does not sit in at 100%? It would explain the hot spot on some of the steel plate?

[Lachie]

If you have probs with the clutch is usually as you take off and would be noticable well before 8500.

I think I remember reading on another oil cooler forum somewhere a similar problem and he ended up replacing the sparkplugs and it was sorted.

This where I would start before getting in too far

[Court93kat]

I would agree. Does not sound like a clutch issue to me. The clutch is much more likely to slip at take off then at high rpm. If the spark plugs are old, change them. I would also check to make sure the fuel system is in good order. There is a large demand for fuel at those rpm's. It might be a slight restriction that flows well enough for lower engine speeds, but not quite enough for the higher rpm's.