In India you wouldn't get a ready made performane camshaft. You will have to modify one.

See attached image. The outer circle is the existing base circle and the inner circle is an imaginery circle. The blackened area need to be grinded/ polished off to let the valves open early and close later. In the process, the lift is also increase and is called high lift cam. Grind only 0.5 mm or so. Keep valve-tappet clearance a little bit loose like .2 or .3 mm as any grinding by hand would be coarse or uneven. Use aftermarket cams available for Rs. 250 or so and start experimenting.

For degreeing, refer to CRF 150 numbers.

http://www.megacyclecams.com/catalog.../page%2020.pdf

If you can understand all this and more, then go ahead. Or else, stop at filter/jetting/lightening/exhaust stage only.

P.S. : One concession you will have to give is that there would be an inbuilt auto engine kill switch into your Carb. You will have to always keep your throttle open 5% at all times.

P.P.S.: Where is the originator of this thread Karthik_R by the way.

Dude,its KARTHIK.K not R...
my comp got screwed up,couldn use it for a long time.
Checked a site xr100.com i guess,in tat they've mentioned bout SLOTTED cams,timing chain drive.does it make any diff??my air screw is still the same,the stupid service center ppl dont take orders nor have stocks of CBZ parts,i've ordered for air screw and engine mounting rubbers of zma,clutch springs a month back,still its on the way.
i've consulted around 10 mech guys,everyone says CBZ has vibes,it cant be controlled,and engine is perfect,they blame the plastic cowls,batt shields for vibes :-)
funny ppl.i know the engine vibrates hard,but they dont agree..
i also askd 2 ppl bout polishing the head,valve assy,but they say unless i've prob with teh bore,its not neccessary..
wat do i do???Is there no perfect mech for CBZ??????????

@invinciblef--dudeeeeee..cool ride u've got there.neat work,and what kinda service u wann me to do??if i ask some mech,they say engine is intact,no need to open it now.
except for polishing the head,replacing new valves and seating adjustments,what else can i do???u suggest some reasonable repairs..
P.S-my bike revs upto 10k,but peak output is at 8.5k,whass the need to rev uptp 11k?? its jus a flat spot beyond 8.5k rite?? or is there anyway to extract adrenaline from the mill beyond 8.5k??

@misterio--dude,that plastic thing is the TPFC..if that is broken,bike'l die without proper idling.is tat happening to u???also heard that without TPFC the bike fetches better mileage.dono to what extent its true..

It can be done. There r few expert hands, ull hav 2 do da research urself as 2 who does it. Vibes r kind of big problem 4 cbz classic's. As far as the fibre parts r concerned. They tend 2 get loose very soon. Even m trying 2 find a solution 2 da vibes. Yes, the mech's dnt agree wid strong vibes in da engine. Wen u go beyond 80kmph, dat time it becomes noticeable. Well da place i live, i get all da things done from the castrol bike zone. I like their work.

Sorry, Bhai Sorry. My mistake. Some simiar sounding names here.

@Karthik.K I Was eager to know your experience with the fiddling of Air/fuel mixture in your bike as suggested by me.

I don't think CBZ has CDI limits beyond 9.6K rpm.

Have anyone of you out there experimented with raising the CR in any way and its effect on revvability of the engine..

Why don't we discuss and argue in the CBZ Classic Motorcycle Owner's Experience thread specifically opened for us, hereafter?

@Maxx--Am tired of searching for cbz or zma experts..all they know is to dismantle the engine,replace bore,bearings,pack it back.they dono what causes what.hope i get some good mech.castrol bike zone ppl also say the same,they wann to experiment with my bike,they wann to open my engine and then find faults.showroom ppl say the same,but ask 9k-10k cash,its too very high,also cant ensure engine will be factory fit and runs smooth.so confused...

@technician--i'l check out the new method u've told..i'l try adjusting the screw in the cylinder side.CBZ doesn've rev limiter but what i askd is,whass teh use in revving beyond 8.5k when the peak power is at 8.5k???

Look at the situation in a different way.

It had 12.8 PS stock. With all those tuning including modified cam, you can add maybe 1.5 PS max. That is it. But then CBZ-Extreme comes with 14.3 PS stock. RTR comes with 15.5 PS stock. Both cost Rs. 60 k plus.

Point is, with all this fiddling, you get a performance similar to these new bikes while saving Rs. 60 k in the process.

And then, for some, the journey (Fiddling) is more juicy than the destination (outright power) itself. It is your decision. And then, there is that attachment factor with your old bike. Only a dumb and an animal would not have an attachment with one's old bike. Therefore, enjoy your bike. If it vibrates, let it be so.

My bike does touch 120 with all those mods and can stretch it further if I employ front end of ZMA and its alloys. But heck, that would be Rs. 10 k plus expenses for a 5-7 kmph top end increase. Why?

If the bike touches 110 kmph on speedo, there is nothing wrong with the engine. A bike with faulty setting cannot touch 110.

On the positive side, the old CBZ was rated at 105 or so while the later version did 110 kmph. If you are able to reach 120-122, that is 10% increase in top end. That is the bike tunning all about.

Even now if you are desparate, then try increasing CR to 9.5:1 and cam modification as mentioned by me earlier in this thread. Start experimenting. The total cost would be less than Rs. 1 k.

with 12.68ps classic cbz can compete equally with the xtreme rite??
ya i do love my bike,anyday its better than the dumb pulsars,apaches,cbz is indestructible,rigid,solid bike,rip it as u like,still its solid,vibes are a prob when cruising,but still i'l compromise for this adrenaline pumping machine..
i like to improve my bike's perf,i'l take a lil time to start experimenting.
and,27ps outta crf150 is unbelievable,cbz with 27ps on indian roads is like woooooooooow

How should i increase the CR? What is the CR currently? I hav port polished the head and the gasket assembly, shaved off 0.7mm off and for detailed mod's cud u plz check my message section. Apart from that i hav a ngk iridium 9 and m planning 2 put in achievers 15/42 sprocket? Is it worth the catch or should i give it even longer final drive ratio? Forgot 2 mention dat in final i m at 9.5k's@110kmph!!!

The current CR is 8.5:1.

Where and what did you polished and shaved off.

With 15/42 sprocket and at 9.5 k rpm, the speed should be 144 - 10 = 134 kmph. Why are you stuck at 110 kmph. Please explain.

Technician - I'm just wondering how u have attained this 120+ kph true on the CBZ. I hope you not quoting off the speedo and then saying that you have referred a gearing calculator.
We have hit 118kph true with the rev-limiter cutting off on the Dyno. And as per the speedgun tests, they max clock 112kph true in 1km.
Whats was that point about increasing top-end by putting the karizma front end? U mean the fairing?
FYI, the gearing in stock wont allow you to get there and so will the CDI.

Bro, in an old issue of one of reputed magazine(OD perhaps), some of Indian bikes were tested to reveal their true power figures where CBZ was rated at 125 kmph at 96xx rpm, Fiero 124 kmph, ZMA at 140 kmph at 91xx rpm. With a stock 5th gear 12.95 kmph per 1krpm, it exactly matches the figure. So it is theoritically possible, at least, that too with stock gearing. I have seen some Members here claiming the stock 5th gear ratio to be 13.1 kmph per 1krpm which was perhaps the case in later versions which did 110+ kmph top speed.

I am running a rear 42 instead of 46 set up where theoritically a max of 136 can be achieved, provided engine makes enough power.

I have no access to Speed gun and don't want to invest in GPS, etc. I have seen 113 kmph at 8.8 rpm on my recently replaced Speedo which is equivalent to 116 kmph on an speedo with stock tyre (as I am running a bigger Zapper C 18" instead of stock Dunlop or Zapper FS 18"). The tacho reading shows 121 kmph with 5+ kmph going in clutch sleepage.

Once I had reached to 9.1k rpm but then my speedo was not working then.

Of course, all this is best case scenario with a little help from WinD God and a race to 2-3 kms. marathon.

By ZMA set, I meant the front and rear alloys with thinner 4 ply Zapper FS tyre at front which are quite light as compared to iron front rim set up of my CBZ with 6 ply heavier Zapper C tyre.

Well, you need an accuracy device to get the right speeds.
Regarding the dyno test in 2006, half the bikes that were tested for that issues belonged to my friends. I know all the numbers and I even had the dyno graph print out. We dyno on the same dyno here.
You cannot claim your numbers based on speedo reads, tyre swap data and claims by other members.
the CBZ has the shortest gearing of the 150cc lot and it does under 120kph on the dyno at cut-off. You might wanna check that graph again.
The Unicorn is the next short geared engine and in the test the Fiero F2 was the tallest geared bike which clocked 125kph.
Again, this is not the basis. Lot of real world conditions such as ur tire pressure, contact circumference, sproket ratio, wheel size etc are the variables.
You cannot prove a point on speeds unless you have a V-box, GPS or a speedgun. You will be surprised when you plonk a V-box.
I have even build a CBZ engine for drag and the bike is currently quite fast in street trim(the bike is transformed later for drags). Runs stock cam and piston, with just a few other tweeks and runs a diff CDI. Runs short gearing and wheelsize/tire. When we tested the bike on a 800mtrs straight, it would do 122kph on the speedgun and do some 10k rpm on th tacho. At the same point a stock CBZ would do 106kph while the speedo was reading around 115kph.
Accuracy devices can take you to new levels.
A lot of these 12sec and 13sec bull-shiit stories in drag racing are no more in existence. With laser devices handling the timing and launch reaction, there is no room for moronic statements. All these 12sec 2-strokes are now doing 15 secs in the real world .

I have only speedo, tacho and mathematical data of tyres, rim, sprokets and data as published by different magazines.

I have no access to a professional environment which may make available things like V-Box or speed gun to me.

I have found that old copyof OD concerned but it never showed that CBZ did only 118 kmph at dyno at cut-off. And that figure was also corborated by official kmph per 1krpm data also, i.e., 12.95. May be something is there between settings of dyno then and now.

Any way, thanks for enlightening us that 115 kmph on speedo is 106 kmph on v-box or something like that high-tech. I presume this is with stock tyres, i.e., Zapper FS.