No problem doing it. but keep one thing in mind , dont lug the engine too much because at stock setup the rpm drop to higher gear will be 1k rpm max but after overgearing it may go upto 2k rpm .

Talking about my experience , i have a ns200. stock is 14T39 , so i dropped the driven sprocket to 36T to make it overgear . result was good to some extent but 6th gear was not usable till 70kmph , after that at 5k rpm 80kmph was too great . but city ride & with pillion ride got hampered. frequent gear changes etc
so i reverted to stock again .

Actually i want to maintain a higher cruise speed without putting much stress on the engine, because fz25 feels a bit stressed in triple digit speeds. What size would you suggest?

I feel 42t sprocket will be too much overgearing from a 46t sprocket. You may end up riding in 1 gear lower at a given speed or lugging the engine. Take this into consideration.

Will try. Thnx fr the help[emoji4]

Not much bikes use a .428 sprocket with 6 holes. So the choices will be limited I guess. You can try the sprocket of the R15 v1. It has 42 teeth.

You can refer to the opening post of this thread. You may find something useful.

The rear sprocket has 6 holes and its a 46 teeth sprocket

How many bolts does the rear sprocket have?? Also the number of teeth in the stock sprocket??

Hello guys...i want to overgear my fz25. Can anyone suggest me 43 or 42 teeth sprocket from other manufactures which will be a direct fit?

[MENTION=96476]ayrus[/MENTION] apart from the difference in shaft design, note that the FZ25 has a .428 kit, so anyway it would have been pointless.

Try the 14 T front sprocket from P220 DTSi, or older model, if you're sure the chain pitch is .520 only. This model's spares would be cheaper too.

DO NOT PURCHASE DIRECTLY, first go to Bajaj SVC, try getting hold of an old front sprocket and try fitting it first... If it fits ok, purchase a new one and you're good to go.

Mostly, the service center sells a kit together and this kit (2 sprockets+chain) combined kit may get a little expensive... Maybe between Rs. 1200-1500 or so.

One way is to give the 36/37 tooth rear sprocket to someone else and share the cost... Another way is to go to a local market and ask for genuine Rolon sprocket and tell them to sell it individually.
Maybe if you offer Rs. 700 or so, they might agree to take the risk of keeping the chain and rear spr... that is, if they can sell it.

There are no adverse effects of overgearing if done properly and if the new kits fit ok.

The petrol engine is accustomed to carry loads, and in India we even overburden it and ride upwards on a slope, nothing happens.
Plus, if you ever feel a gear is too high, just shift a gear down, its the same thing technically.
Just make sure the 1st gear doesn't turn out too tall to pull in some situations. (which it shouldn't, on this setup. Read on...)

You're just doing a small change, no big deal. 45/13 is 3.461 and your new setup is 45/14 which is 3.214. Little overgeared.
No big deal, but it will be noticeable. Do let me know how it turns out.


NOTE: Skip trying for the FZ25 front, 15T would be a bit heavy unless you've modified the engine for more power...




Done bro, Thank you so much.



PLEASE NOTE ALL: FAQ post added on Page 1. Check it out...

Part Number: DV101048

Rs. 162/-

14T Front Sprocket, the exact same one seen on all motorcycles even remotely related to Bajaj with a .520 pitch setup.

I'm planning to get a 14 or 15 teeth front sprocket that suits the .520 chain for my RTR 200. What will be the cost? (not worth if it costs more than 500 bucks) (also I want the front sprocket only. I don't want to waste money by buying 2 sprockets and chain set)

Try the 14 T front sprocket from P220 DTSi, or older model, if you're sure the chain pitch is .520 only. This model's spares would be cheaper too.