Based on the quoted info below, Unicorn front sprocket is straight fit to FZ. You can try the same for R15 if FZ and R15 front are the same. Max of 100rs.

Yeah i too noticed that. Also, the cost of Rs100 is pleasant as I was expecting upwards of rs250 atleast.

I wanted to clear some of my doubts about sprocketing.

1. My bike comes with 14-42 stock setup, hence the chain would be made for this particular setup (I'm referring to the no. of links / length of the chain). Now since I'm altering the sprockets, would it have any adverse effects of the chain? I really don't want a busted chain on my new bike.

2. My bike uses o-ring chain. I dont think that the unicorn uses an O-ring type chain. Would this cause any problems for the chain / sprocket?

3. Can the authorised svc void the warranty on my bike if i change my front sprocket?? If yes, then which parts' warranty shall get void because of changed sprockets??

4. This is not a sprocket related question but still :
I've had to tighten my chain once as it got loose while running. this tightening was done at yamaha authorised svc only and the mech shifted a part on the end of the swing arm which was connected to the chain/sprocket and it had indentations which allowed it to get stuck to a metallic kink on the swingarm.
My question is : Why does the chain get loose after running a certain number of kms? It is made of metal and is certainly not stretchable.....so how and why does it get loose ??

5. Another theoretical question: My friend had to replace his entire chain on his R15 after around 30-40k kms, as it had become loose and there was no more room for it to be tightened. Now since the chain had become loose or in other words had gained in length, would using bigger sprockets enable the use of the same loosened chain again?

Answers in bold to my knowledge !!

Thanks for the replies, specially to question 4 and 5

guys i am in need of making my p150 ug3 gears taller for top end speed. I think stock setup is 15/44 , bike is 25K [2 yrs ] old in stock setup.

1) Should i go for a whole new setup or just the front sprocket change?

2) Which bikes sprocket set is a direct fit for tall gearing?

3) i approched many mechs : local, castrol bike and bajaj service guys and these grease monkeys dont understand what i am asking for , they simply say u cannot do that, its impossilble and all the stuff, suggest me a good mech in HYD for this.

1. Front Sprocket? Very rare bikes have 16 teeth front, ok? Maybe Rx135 has it, but it won't fit.

2. P180 UG3's sprocket set, which is 15/43 is direct fit, but one teeth will hardly give you a difference.

Also, check all generations of Pulsar. If any one gen. has a 42 teeth, but with 4 holes, it might fit.
Older Pulsars mostly had 6 holes, which won't fit.

Also, I strongly think that, the 42 teeth rear of Discover 125 (after March 2006) might fit... can't guarantee though.

Try going into showrooms and try old sprockets to decide which ones fit. Old ones are lying around for free...

3. Only Hyderabad users can help about this. I'm not from there, so sorry.

Sorry to quote myself, but can anyone answer this for me??

Guys im interested in trying out a smaller rear sprocket for my FZ.stock is 40,is there any 39-38 sized sprocket that i can use with the FZ?

thank you

parth you could use.a bigger front sprocket

use front sprocket of unicorn!!..15 teeth i guess!!

replace 40T with 15T? no thanks!

40 Teeth is your rear sprocket man!! 14 teeth is your "Front or Gearbox Sprocket."

One end of chain is the rear sprocket. Front Sprocket located on the other end of the chain, the front side.

Currently, your FZ has 14 teeth in front sprocket. If its replaced with a 15 teeth one, you'll get more top speed.

You've heard wrong. You can change sprocket with any number of teeth safely, as long as they modify gearing "slightly".

An approximate Safety rule for a stock bike is maximum 1 teeth change at front and 3 teeth change at rear.
See my first post for more on final gearing ratio.

If you do extreme over-gearing, it should be only after your bike produces more power than a stock bike. For example, a modified bike with K&N, after market silencer, etc.

As for your R15, Just get the FZ's rear sprocket 40T, and get it installed..

Hi experts
I had a sprocketing query:
Stock teeth: 14/42
Change_1: 15/45 increase in both sprocket
Change_2: 13/38 decrease in both sprocket
How will it affect gearing? Any ways to increase both the top-end & accelaration, without screwing up any or both of them?

you mean you want both that is impossible,In that case stick to stock sprocketing....
If you want top end then change front Sprocket to 15 teeth from 14teeth,rather changing rear one.
If you want acceleration then change the front with 13teeth from 14T
don't change rear in both case let it be stock.

Thanks Zayn. Will 1 teeth make any reasonable difference? Be it in Accelaration or Top end? & How much will it affect (adversely) the other?