Loose chain can often cause that, ratio being a bit harsher and less bike momentum (may be more clunky short shifting). Could be oil going off (old/cold/condensation).
Mick
as Mike said
I would be checking the chain (and sprockets) first
for wear..and for correct adjustment
also make sure there is little or no wear
on the cush drive (rubber bumper) in the rear end
yea mate..id check the chain, and the oil..altho kwak's are notorious for being clunky..very clunky..ussually 1st-2nd tho..sumtimes higher...
my money is on oil...
My ZZR6 often did that particularly in relation to the chain as others have said.
Also occured due to laziness sometimes in not loading the gear lever before pulling the clutch in
If you have no fear, you're not going fast enough. Never argue with an idiot. He'll drag you down to his level, then beat you with experience.
It's a ZZR600 - it's always going to be a little harsh in the lower gears. I can NEVER get the 1-2 change on mine perfectly smooth. 2-3 is a bit smoother and I can often get 3-4 through without even a click.
Having said that, if it's bad enough to bother you then do the checks the others have suggested. If all that's ok, then ignore it.
If ducati can rattle, then Kawasaki can clunk. Mine clunks on 1st gear I just call it a "character".
andi - Red GPZ900R, GPZ750R1, KLR650 Tengai, KLR250 "my dad's motorbike is cool it is all ways clean.oheter pepole' s motorbikes
are't like my dad's one it's because their is one not always clean." -ariel circa 2007 http://GPZninja.blogspot.com/
As mentioned Kawasakis are often clunky in the box-particularly first to second- can be the 'positive neutral finder' being 'positive' about going into second....
2 X ZRX1200R 4 X ER6N, GT550, 1988 ZX-10, 4 X GPZ250R, 4 X GPZ900R and GPZ750R Yeah I like Kawasakis.