changing sprocket for a zx2r

[krusty]

This document tells you everything you need to know about the ZX-2R..
Do a search for "sprocket", check index or go straight to pages 90-92

http://ninja250.kingston.net/~jeb/Kawas ... %20FAQ.pdf

The American "ninja" is actually what we call the GPX250R

[team-gt]

sorry if i'm rehashing old news but how did the conversion go?

I'm up for chain and sprokets soonish and was considering the same.

With the zx2 we are already changing gears often enough!

I hate changing down to 1st on the really tight stuff (probably just a personal mental thing). Can you get any more use from 2nd a little lower on the speedo?

[GForce]

ive found the chain i am looking for its called xring chain gold. cost around the 130 mark.
as for the rear sprocket, no one in adelaide here knows how many teeth it has on the stock one. they get can from a 40 teeth to a 48 teeth but god damn stupid bike shops have no idea what the stock one is. they just said they would just use whatever is on their screen and 3 bike shops had diff teeth.
im gonna count my teeth and ill get back to you soon of what to get.

[krusty]

as for the rear sprocket, no one in adelaide here knows how many teeth it has on the stock one. they get can from a 40 teeth to a 48 teeth but god damn stupid bike shops have no idea what the stock one is. they just said they would just use whatever is on their screen and 3 bike shops had diff teeth.
im gonna count my teeth and ill get back to you soon of what to get.

Page 1-6 in the "general information" section of service manual you have says it has a 48 tooth rear sprocket.

I just noticed an interesting thing, I've compared the gear ratios of the 6 gears in the gearbox of the gpx250/zzr250 and the zx2r and they are the same (but the components are different).

[GForce]

i know this is this a very late post but i found something very interesting. today when i was cleaning my chain for the first time ever, i was counting my rear sprocket teeth. i was going to get new sprocket and chain a few months ago but i the sprockets werent fully shagged yet.
anyhow, the zx2r manuals says i should have a 14/48 but the sprocket on mine is 14/40.

the reason why i counted it today is because when maxing out my bike, i couldnt rev out my 5th gear. i was hitting roughly 210-215km/h on the speedo and i think i had another 2000+ rpm to go (cant fully remember coz i was going too fast)

my question now is should i go up 3 on the rear? or should i go up to a 48? im worried that going up 8 on the rear might be too much

[Neka79]

u sure??

the more teeth u have, the quicker the acceleration.....but the slower to top speed.

i thought the rear of them was abt 42-44..sumthin like that, and i kno Logan went to 48 teeth the other week cos the bike shop stuffed up, its made his acceleration great, but he's lost top speed...

if u go from 40 to 48 ur bike will slow down to abt 180kph top speed i reckon, but boy it will be easy to wheelie.

i think who ever last changed it, dropped a few on the back to pick up top speed, cos ive never heard of a 250 doing more than abt 190-200kph with standard gearing....

if u got ne dramas drop me a pm and im sure i can assist in sum way

[GForce]

thanks neka, your a champ.

ive rang around all the places in adelaide i can think of and they only come with a 40,41 and a 48 teeth rear sprocket for the zx2r. i wanted to go up 3 on the rear but thats not possible so might go and settle for the 48 which is the stock setting.

[Neka79]

is what u have now good for u???

that gearing is slower off the mark but has a faster top speed...kinda like a train...slow to get going, but once they get going they wind out to a handy top speed....

its funny, sum sprockets they dont make in a full range of say 40-48 in 1 tooth increments...but sum they do...

if u change the back, and the chain, then change the front too , otherwise itll just chew out the others neway.... think abt what u want...faster acceleration (handy off the lights) or faster top speed (handy at the "track" )

oh and 3 at the back is the same as one at the front....
so consider going to 13/40 would be similar to 14/43 (if 14 is standard front- u dont want to go less than 1 standard on the front or u start having probs with sprocket wear AND chain running circumference)

[GForce]

yea i think 1 down on the front is the way to go. im sure that will make my bike accelerate faster of the line and good enough for track. i just want more acceleration coz i know i got good top speed compared to most 250s.

[Barrabob]

Go for whatever stock is on the 250 and yeh be prepared to change gears lots but thats how they work and just try to avoid useing the brakes.

I had a cbr 250 and you couldnt get smaller fronts for them just diferent rears and the stock one was the best one for me.

if you are fitting new chain and sprockets http://www.chaingang.com.au do custom sizes in steel but they are pricey and once again they dont do fronts.

The babyblade had a 428 pitch cain i dont know what a zx2r has.

[GForce]

i am going to experience with a 13 front and 41 rear. that would be very similar of 14/44.
now does anyone here know where i can get this put in for me for cheap? peter stevens wanted to charge me 120 to install.

[Gosling1]

...now does anyone here know where i can get this put in for me for cheap? peter stevens wanted to charge me 120 to install.

was that *just* for the install ? At approx $80/hr workshop charges, thats 1.5 hours, which is a *bit* slow for a chain/sprocket change, bit I doubt you will get it much cheaper than that anywhere else.......

[Neka79]

...now does anyone here know where i can get this put in for me for cheap? peter stevens wanted to charge me 120 to install.

was that *just* for the install ? At approx $80/hr workshop charges, thats 1.5 hours, which is a *bit* slow for a chain/sprocket change, bit I doubt you will get it much cheaper than that anywhere else.......

yea...all u need is a rattle gun or big breaker bar, a chain breaker/joiner...and the perts....

i could do it in my garage if i can borrow greeny's joiner...tho i dont have my rattle gun ..its at my mates place with my compressor...

where do u live??

[GForce]

i have a rattle gun but dunno about the chain breaker/joiner. i live down athol park area near arndale and i am happy to pay you neka79 as long as it doesnt cost me an arm or a leg. i just hope by going down 13/41, my 520 chain will still fit.

[Neka79]

i have a rattle gun but dunno about the chain breaker/joiner. i live down athol park area near arndale and i am happy to pay you neka79 as long as it doesnt cost me an arm or a leg. i just hope by going down 13/41, my 520 chain will still fit.

if u go down in teeth it could affect ur chain length..no biggie if u gotta cut a link or 2 out, but a BIG issue if its not long enuf...
how olds the chain?? if u change the sprockets but the chain is buggered it will chew out the teeth- better to wait an extra week and buy aa chain too and do it all together...

mate im not gunna charge u..i dont want ur $$... i get my licence back friday (busy day for me) , work sat, and im goin riding sunday...when u free to do it??
ill borrow greeny's breaker or alternatively he may even come laugh at me...

actually u may only need a clip join chain ona 250 (it may have one already) ..if its riveted ull need a new link neway, but for the sake of abt $70 for a chain, id get it too...