tuning small bikes!!!

[pepperami]

Hi! i`ve been into bikes a long time now and have had my share of different machinery.
i`ve one or two quick bikes in my limited career as a biker such as race tuned Bultaco Pursangs, race tuned LC, and i now have a ZX6R.
but getting them done profesionally or buying them was very expensive but no challenge.

so now i am looking at doing my own and easy tuning on a shoestring buget.
and this got me thinking off all the small bikes out there that may be suitable?
so what tune up bits are out there and for what bikes?
does anybody know of any tune up tips for the Honda CG engine?
i know they can be tuned as i have seen them in junior Grass-Track bikes, and they whizzed along at a right old lick

dont say buy a bigger faster bike as that defeats the object!

the sort of bikes i am thinking of would be 250cc or less and single cylinder.
Either 2 or 4 stroke

come on folks give me some pointers please
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[hmmmnz]

well the obvious is a 2 stroke,
as real tuning on a 4 stoke on a shoestring budget is an oxymoron

as to what bike, well 250cc 2stroke singles are almost all limited to dirt bikes,


so a smokey supermoto project sounds like the best idea given your criteria
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[chris-red]

Sounds like you want an MZ
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[oldbiker]

get the book by A.G.Bell performance tuning in theory and practice (four strokes) and read it many, many times.

for tuning two strokes the books by Gordon Jennings And A.G.Bell are the must haves.

If you search the net you will find them on some of the race\tuning forums. as downloadable pdf files.

Don`t just search for engine tuning I did that once and found loads of fake virus programs attacking my pc
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[pepperami]

thank you for replies folks...

firstly.. tuning a 4-stroke? ... could a way of improving a Honda CG engine be as simple as rejetting the carb? or putting a different carb on?
are there aftermarket exhausts out there, that might let the little engine breathe a bit better?
i dont think i will go down the route of trying to put bigger valves in a CG as i think that would be more trouble than it`s worth.

Buying an MZ i did think about this and there is loads of stuff out there to upgrade your MZ.
Have you seen the price of some off that stuff the tune up bits would cost more than the bike
having a zippy MZ does have some appeal though

i will be looking out for those books over the next few weeks and thank you for the suggestions.... the ones by A.G. Bell are first on my list.
thanks for the tip about viruses
____________________
I am the sum total of my own existence, what went before makes me who I am now!

[EnergyInducti...]

For parts out of the shop for the cg, all you can really get is a free flow air filter, carb rejet and a sprocket set to alter your gearing. If you want to go further, you're looking at some major cash. But here are some things you could do.
Lighten the valvetrain with some lighter yet stronger pushrods.
If you must, you could cut and weld your own piping and weld a sports can on the end of your home made header,
Having your head p&p will increase gas flow.
Skim your head to increase compression ratio, but you will have to run higher octane fuel to prevent detonation
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[pepperami]

[hmmmnz]

[chaz e z]

RS 250
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[hmmmnz]

[G]

Probably means the CB250RS - always turn up when looking for funner ones - especially the Honda RS250 .