The p220 is sold in malaysia also
and a lot of the guys there have resleeved there engine even to 250cc
the parts required for these mods could be acquired from there
u can get oversized pistons, camshafts, cdi's etc.also ffe's

did u sell the 180

@kb100:

No dude am having it ..... how can i think about selling it???

why sudden interest in 220

Itz not a sudden interest dude...
an usual thirst... and i am looking something outside the box..
proper ratio of power and torque

Why are you soo keen on changing the head ??
Get your head ported by an expert, it will give you remarkable increase in performance.

get an rd350

gettin an rd: easy part

maintaining an rd: difficult part

would need some good contacts in saudi to keep the tank always full

@NCG:
am planning it to take it to higher cc's buddy, both in terms of bore and stroke..
I need it to be cruisable.
if am doing a mod am looking for maximum possible gains, so a head change is necessary..
Please tell me about the sleeve

I'll tell you about whatever i know (i could be wrong too), all i am trying to do is give more information.

If you want to increase your CC, you have to increase either your bore or your cylinder stroke.

Now normally what everyone do is change the bore size, this is easier and the output is relatively better than working on the stroke.
Also this process is very very cheaper as compared to stroke thingy.

To change the bore, as you know one needs to machine out the metal as much as possible from the sidewall of the cylinder sleeve.
Now every cylinder is lined with this sleeve which actually looks like this.



now imagine this sleeve to be of say 4mm, in this way if you bore this cylinder more than 4mm, the sleeve will be lost.
So what these guys actually do is, bore out 9mm, ofcource loose out the whole sleeve by doing this, and put up a new 5mm sleeve and again bore out to say 1mm.
Now this is dependent on the engine layout and the cylinder geometry as well.
Hence it difficult to judge how much can you bore by just naming the bike. If the expert analysis your cylinder thickness, the joining bolt spacing, etc etc only then he can confirm as how much bore is possible.

If you bore more than 4mm you need a new sleeve (AFAIK).
my friend has gone from 57mm to 65.5, which is 8.5mm and he had to change the sleeve.
That particular sleeve can still be bored out to 67.5mm, now its the beauty of the engine more than the beauty of the work done, to handle all these things.

Now comes the stroke part.
Well, if you increase the stroke, you won't get top end performance, which every engine mod enthusiast as well as racer (who mods to compete) wishes for.

Comparatively, the improvement as well as reliability is difficult to judge.

For example if you have bored out to say 5mm, and you feel that the compression is too much to handle with the stock head, you can increase the diameter of your head to decrease the compression, but what option do you have if you increased the stroke to 5mm and the compression is too much to handle ???
You cannot enlarge your head more than your bore size.

but if you are still keen of increasing the stroke as well as bore, you can still do it, but all i would say is that playing around with stroke (for what you'll achieve with it) with the amount of money you'll spend on it is not worth it.

As already explained before, boring upto say 5mm is possible on almost every cylinder.
Go to an expert, show him your cylinder, he'll tell you how much he can bore out (ofcource with a new sleeve).

Your current engine capacity is 198.85cc
If you increase the bore upto 5mm, you'll get 229.63cc

But arguably if you increase your stroke upto 5mm, you'll get 216.47cc

lets again calculate if you increase both the bore and the stroke upto 5mm
i.e 72mm bore and 61.4mm stroke, you'll get 249.99cc (a quarter liter)

But if you can keep the stroke same, and maybe bore out till 75mm, you can still get a quarter liter of 249.17cc

All this was to inform you that changing the stroke length is not a feasible option.
Even if you do that, you'll have to change the block (maybe not), the crankshaft, the con-rod, the timing chain, and most importantly fitting the engine back on the chassis would be difficult job as the top height will increase and the upper bolt on the chassis will mismatch.

Besides, after deciding and doing the much waited bore, you can still get the current head enlarged to ease off the compression a bit, and still get it ported to have a marginally good increase in performance...

I hope all this information helped.

Thanks a lot dear buddy...

I have never thought of the join bolt spacing...

What am aiming is better power and cruisability

if you want to make your engine feel more relaxed for cruising then why not first try a few sprocket setups??
maybe u can bore out the engine as well as make the gearing taller to get better pickup due to bigger bore and better and more relaxed speeds with the taller gears

Revvhard:

Ya that is good suggestion dude..
But i will be trying only after the mod.
Am looking for really good gains and then towards cruising.