I have A 2000 zx600j and I took off the rear tire to change the sprocket. My mistake was doing the back before the front sprocket and I've already cut the chain. Now I'm having a heck of a time breaking the bolt on the front sprocket. Any tips?

Do you have cutouts in the disc or solid?. Seen this before- Caused by loose pads- and they rattle.

Wait until you get new chain and sprockets to do it.

hi, in there wisdome kawasaki played around with tyre sizes on the zx6r ninja,

tyre size rear 160/60/17.
tyre size front 120/60/17 1995-98 models zx600f

rear. 170/60/17
front 120/60/17 1998-2000 models zx600-g1

rear 180/55/17
front 120/65/17 2000-01 models zx600j

the only thing they didnt play around with is the tyre pressures all models front 36psi or 2.5 bar
rear 41psi or 2.9 bar

hope this helps and thanks for using fixya.
paul

You will need either a larger transmission sprocket or a smaller wheel sprocket. The larger percentage change will occur with an increase in the front sprocket number of teeth. The way to mathematically determine that is to consider the present tooth ratio/RPM and relate that to the desired ratio. There are practical limits on how big the front sprocket can get before having interference problems. A 2-tooth increase should come fairly close. It would take about 4 to 6-tooth decrease in the rear sprocket to achieve the same results. Take your pick--the front sprocket should be cheaper and much easier to install. You will need to adjust the chain length accordingly. There will be a minor acceleration decrease due to the change. A fatter rear tire will also increase speed somewhat too. Hope this helps!

wheel rim damaged ?? locating pin for wheel not lined up

Usually, it seems that changing the front sprocket is more cost effective and easier to do. The front sprockets are about $10-$20 and rears are normally around $40-$50. Usually 1T gearing changes made to the front sprocket are the equivilant of a 3T-4T gearing change to the rear. I personally would go up on the front instead of down on the rear. Right now your gear ratio is 3.846 (meaning every 3.846 rotations of the front sprocket, the rear sprocket makes 1 rotation) If you go down 2T in the rear (13/48) your gear ratio would be 3.692 giving you a little less torque and a little more top end. If you go Up 1T in the front (14/50) your gear ratio would be 3.571. This would be about the equivilant of a 46.5T rear sprocket. (If they made it) The nice thing about doing the front sprocket first is the cost. If you decide it's too much difference and you want something in between, you can put the stock 13 back on and then change the rear (and you would only be out the $$ for the front sprocket) If you start with the rear and decide it's not enough then you change the front you're out the $$ for the rear.

usually kawazaki zxr 400 has these problem the main reason is due to the overspeed.only authorised kawazaki dealer can solve it.....

Wind the chain through the rear sprockets, grab a hold of the rear sprocket and rotate the smaller sprocket towards the pedal, that should give you enough slack to put the chain on the front sprockets

I struggled but still managed to get the job done. I think I knicked up my rotor and sprocket teeth and had a hard time putting the new tire back on the rear rim. How do you guys do it? Any suggestions? How do you save your rotor? Do you take it off? I've got what you need. I've watched it 1000 times. After struggling 20 years it's not that bad now. Here's a video tutorial http://youtube.com/watch?v=qw0B2gIwbBg ,,,

what are the considerations given my weight and riding style ? Is it better to modify rear spring firstWould save the labour fitting the springs when the seals are done . Bets to fit a set front and rear however just front is still an improvement but you may soon find the back isn't up to it , because springs ideally should be matched. Using higher preload on the rear will help , but you will run out of pre load 2 up and loaded. ,,,