actually the power output between first generation kips and second gen superkips do not differ much between each other. its around 30-30.5PS. but superkips engine do it with so much more efficiently, saving fuel and improving power delivery at the entire rev range, instead of just top end.
but in the end, the superkips will have a better acceleration due to its stronger mid-range powerband.
there is this model known as ZSR Cyclone, produced in 1998 in Malaysia with some tweaks to the engine and others and therefore capable of about 40hp, an increase of about 25% power. among the changes made were different engine block (1855), CDI, power valve as well as exhaust pipe. but i doubt your scrambler need that extra power.
Thanks for the info it's very helpful. Regarding extra power, this is important for dirt bikes, many 125cc motorcross bikes have around 35hp. However I think a lot of this extra power comes from large carburetors (38mm), enduro bikes generally have less power but are more reliable and fuel efficient. I'm interested to get a little more power, enough to lift the front wheel easily.
So I'm interested to increase power, especially at bottom and mid range, however reliability and fuel consumption are important. I'm also interested in large radiators as overheating can be a problem.
Regarding prices in Thailand, after a web search I found this. Please note, many people over here are using second hand parts, as they're much cheaper. I was quoted $200 for a new engine in excellent condition.
Cylinder block KR 1855 Gold 4550 Baht.
Cylinder head + ring 1165 Baht Cylinder head + ring 1165 Baht.
A top cover of cylinder block 1000 baht A top cover of cylinder block 1000 baht.
O-Ring 125 baht O-Ring 125 baht.
Order to build new Muffler 2800 baht Order to build new Muffler 2800 baht.