problem with the zx9r

[shinnynoggon]

had a top day at the creek but have a problem with 3rd gear,,,,,,3rd is fine when on the gas but when i back off the bike starts to serge ,,,,,bring on the power and it's fine,,,,,,when gearing down and using the engine to slow down everything is good but in 3rd gear,,,,,problem is with 3rd gear only when off the gas,,,,,,hoping someone mite know what the fark is going on,,,,, i've got 2 more track days left this year with the 13/12 chrissy the last until after WSB so wishing to have it fixed by then,,,,,,help needed asap if any damage will occur on the next trackday,,,,last session at the creek wasn't using 3rd gearing down ,,,,cheers paul

[shinnynoggon]

has anyone got any ideas ,,,,just need to know wether i need to cancel my track days till it's fixed

[dave#3]

Paul,

It doesn't sound like any of the gearbox issues I've ever heard of 9's having (popping out of second being the most common). As I said at the track I can't think of what it might be based on your description (if it was worn plates or springs I'd expect it to be spinning up when you get on the gas not surging when you're off).

Is it possible that the issue is fuel related rather than gearbox/clutch related but you're only noticing it in 3rd gear? Which corner(s) did you notice it most?

[shinnynoggon]

every time i backed off in 3rd ,,,,, what puzzles my i still have drive with no probs

[Rusty]

What's got me is that it's only in 3rd. Every cause of a surging problem I can think of will affect every gear.

[JetPilot]

Mate its really hard to tell what its doing without riding it to feel the problem 1st hand.
When you mean a surge, do you mean a rise in rpm with no momentum forward or a surge of movement from the bike?

[shinnynoggon]

when i back off in 3rd the bike feels like it freewheels then engine brakes and just continues doing this until you get back on the gas or change gears ,,,,thats the best way of explaining the problem

[robracer]

Clutch? but then it would be every gear

[shinnynoggon]

on the 24th i'll give it to dave or who ever mite be able to pin point it ,,,take it for a lap see what happens

[Six Addict]

does kinda sound like fuel, only as its been stated, that would be affected in every gear...

would be something wrong with the actual gear or gear slector??

[Rusty]

Clutch? but then it would be every gear

And worse in lower gears.

[jl4049]

Is this accompanied by a god awful crunching or banging noise?

[98ninja]

maybe its because of the midrange
too much midrange power