sprocketing

[me is rossi]

But, the stress on engine is as much as driving in higher gear. I mean by this way, even a normal bike can be stressed. Drive a Pulsar in 5th @ 10 kmph - it will be stressed. right?

I think it won't be stressed provided you're in right gear/ rpm ... I had 3 teeth short, nothing happened!
!

dude if u could achieve that u will be a feature in this year Guinness books of records
btw can we have gear boxes changed; as in a honda gear assemble on a pulsar...possibility hai??

[Harmeet]

my p180 v1 had 42 rear,,,I changed the stock rims to alloys which support hero honda hub earlier i used cbz sprocket and now im running on ambitions sprocket,,,

cruising is sweet, reduced vibs and better ripping,,it can hit 90 in 3rd gear now very easily,,,but while commuting i do get some knocking and have to use a bit more clutch.

with cbz sprocket wheelie was soo easy ,,,i could do it without even using clutch

[silver_falcon_46]

hey guys i wanna increase the cruising abilities of my cbz xtreme and increase the top end so I thought id do some sprocketing well i have two options
opt 1 take the chain sprocket kit from my bros zma(lying unused for for the past 6 mts since he has gone abroad) or
option 2 manually reduce the number of sprocket teeth through welding

the reason i plan on doing this is that the xtreme can red line quite easily in 5th and and does around 115-118(speedo) at around 9000rpm redline and can go on to touch 125 tops at around 9500+ rpm hence if I put the zmas sprocket i can do around 115-118 at around 8000 rpm and be able to touch around 130 before it redlines the cbz xtreme being more rev friendly unlike the zma which looses massive amounts of power after 7500 rpm I hope a little tall gearing would not be hazzardous and more beneficial during long tours with lesser strain on the engine I would like some gyaan from some experts before carrying out this mod..

Btw does any one know the front and rear sprocket sizes of the xtreme???

Why don't you just use the your brother's 6month old unused Zma instead

We'll dont push it with the teeth in the rear. The reason why the company chose the certain no. of teeth is for a reason. You mess around with the teeth and you will struggle to pick up speed on every gear and going with a pillion will feel like your on a Boxer or soemthing. I changed my 200's rear from 38 to the 220's 37 and I can already feel the difference. On a 150cc it would be way more apparent. I got a better topend, got about 4kmph more than a stock 200 and cruising ability has been better, about 300rpm lesser rev's and I hit a good mileage on the highway at about 44kmpl too. highest ever was a 41. But I know that if I decrease 1 more teeth i will be spoiling everything. replacing it with the zma's rear sprocket, baaad idea, try one or max two teeth less. If you over do it, and if you plan to do any wheelies with a smaller rear sprocket, you surely going to end up with a bent crank.If your a city commuter then you will loose your clutch plates soon enough too. So watch out.

[Richard]

ok i rode this 180...its almost impossible to get the thing moving without dragging the clutch..couldidnt shift above 3 gear in the city..but after getting onto an open tarmac...i ripped it upto a speedo indicated 139..n it did it with ease the rpm meter wasint working..but i think i was at around 8k something..

dude if u could achieve that u will be a feature in this year Guinness books of records
btw can we have gear boxes changed; as in a honda gear assemble on a pulsar...possibility hai??

its not possible on our regular four stroke ponies..but many replace the 4 speed on bulls to the newer 5 speed ones.

[me is rossi]

ok i rode this 180...its almost impossible to get the thing moving without dragging the clutch..couldidnt shift above 3 gear in the city..but after getting onto an open tarmac...i ripped it upto a speedo indicated 139..n it did it with ease the rpm meter wasint working..but i think i was at around 8k something..

its not possible on our regular four stroke ponies..but many replace the 4 speed on bulls to the newer 5 speed ones.

>what was the config of the sprockets??

>can you please provide hopefully a technical/logical argument for that one?

[Joel]

A certain 220 I know was running the ZMA's 40T rear sprocket, instead of the 37T stock rear sprocket. The dude landed up with a bent crank and a few more things....

Well this is news to me.
I m wondering how u guys come-up with this. How on earth can final gearing affect the crank? Its impossible.
FYI, I except my R15(coz it has to remain stock for racing) I have never used stock sprokets on any of my bikes. My Fiero, all its life has only run on smaller sprokets. With the engine producing nearly twice the stock power. How do u explain this? Going by this logic, my crank should be mangled to a lump of metal.

The only reason why such a pulsar ended like that is coz the user dragged the clutch a lot to gain low down poke courtesy the tall gearing. So the clutch bell/primary would have taken beating for sure. Also keeping in mind the great quality of bajaj parts, abuse is never recommeded.
A bent crank, well I'd say its an offset problem that could have developed coz the pulsar 220 runs a longer stroke.

BTW, the Xtreme runs 14T front and 43T at the rear. Use the 42T from the pre 2007 unicorn. Will improve top-end a bit. Anything lower will kill acceleration drastically unless its producing more horses.
If u need to have the same level of acceleration as stock and yet get better top-speed with a 2-3T smaller, u better have atleast 2bhp more. Which is impossible. So just drop one teeth at the rear.
Thats about it.

Joel

[Aparajith]

^^Joel, if u use a 40T rear-sprocket on a 37T recommended, ur making the gearing shorter, right?

Also, am not sure of 40T wrecking the crank, but I have seen skyscraper's 220. It uses a 54T rear-sprocket for wheelie purposes and he said that he bent his crank and had to lighten the sprocket, crank etc to prevent it from occurring again.

[Joel]

Like I said, looks like the p220 is prone to a lot of crank offset issues.
Well thats a one-off product. Leave that alone. There are other bikes to worry about.

Yes, larger sproket at the rear means shorter gearing. People still havent understood gearing, which is the most basic thing. jetting is anothing big black magic.
Its better is such people leave their bikes stock.
I guess this is disussed some 100000 times on this forum.

[road_ripper]

The 40T rear makes the 220 gearing shorter and i dunno how a shorter gearing will result in a bent crank
With shorter gearing the load on the engine will be much less right?? Only if the load is terribly high it'll result in something weird.. so..
I think this news is purely a speculation...


Hmmm.. Is the Discover 135 sprocket available seperately or do i have to buy the complete chain sprocket set?? The complete set is costly..
The discover 135 sprocket is 42T rear and direct fit to 180 ug3 right??

[Andy-)]

Why don't you just use the your brother's 6month old unused Zma instead

If only I had a bike tailor made for my requirements with good low end torque which is consistent up to he red line If the zma could redline more easily up to 9k rpm I would be content and the xtreme hits the rev limiter quite fast hence i thought that some slightly taller gearing could extend the powerband slightly higher up and increase the top speed so I wanted to know if there would be any detrimental effects
btw the zma is around a couple of yrs old but becoz my bro isnt using for some time it Im free to experiment with it.So i thought id try a sprocket swap.

[Andy-)]

Well this is news to me.
BTW, the Xtreme runs 14T front and 43T at the rear. Use the 42T from the pre 2007 unicorn. Will improve top-end a bit. Anything lower will kill acceleration drastically unless its producing more horses.
If u need to have the same level of acceleration as stock and yet get better top-speed with a 2-3T smaller, u better have atleast 2bhp more. Which is impossible. So just drop one teeth at the rear.
Thats about it.
Joel

well thanks for the info ill try to source the sprocket from the uni if I can get my hands on it.any way if the power loss is too bad with the zma's sprockets i have the liberty to switch them back anytime.Let me see how the bike performs after the swap!!!

[steveburnside2001]

@joel - I thought the sproket size of a uni was 42. has it changed in the newer model post 2007

[silver_falcon_46]

If only I had a bike tailor made for my requirements with good low end torque which is consistent up to he red line If the zma could redline more easily up to 9k rpm I would be content and the xtreme hits the rev limiter quite fast hence i thought that some slightly taller gearing could extend the powerband slightly higher up and increase the top speed so I wanted to know if there would be any detrimental effects
btw the zma is around a couple of yrs old but becoz my bro isnt using for some time it Im free to experiment with it.So i thought id try a sprocket swap.

I'm surprised you find the Xtreme better for you needs. The Zma has low end torque way better than the 150cc machines and even though it may not rev happily all the way till 9k, by 7.5k you have achieved all of the 17bhp, and its way way more quicker and the ideal machine for touring. Probably you would love the RTR - revs mad.

[Joel]

@joel - I thought the sproket size of a uni was 42. has it changed in the newer model post 2007

Post 2007 models, i.e the ones withthe alloy wheels and the 100/90 rear tyre has 43 at the rear.
The xtreme also comes with the same 43.

[Andy-)]

I'm surprised you find the Xtreme better for you needs. The Zma has low end torque way better than the 150cc machines and even though it may not rev happily all the way till 9k, by 7.5k you have achieved all of the 17bhp, and its way way more quicker and the ideal machine for touring. Probably you would love the RTR - revs mad.

Im not trying to compare the two bikes but im trying to get more out of the xtremes power band before it hits the rev limiter the xtreme being my primary mode of transport im hoping to get some more out of it.
ne way if im going for another bike it hopefully must be something with higher displacement and substantially higher performance and moderate pricing until something like that comes along ive got to make do with what I have.