well i read comments on this post reply but i wont agree that you cant get performance from this tiny 800cc engine ,,,,,,,,,,years before i make this engine for performance and really it performs even batter than any 1000cc car,,,,,,,,,,recentelly i have make a cultus engine and i can clearlly say that it can beat any 1300cc car on an open road , even they can stand near to it,,,,,,,,,,and all that be achieved without installing any turbo or super charger ,just the original engine with some real upgrades in engine,,,,,,,,,,,,,,,few things you can do to improve your engine performance ,,,,,,,,,,,first of all you have to increase the compression ratio,,,,,,,,,,,i guess originally this f8b engine comes with 8.5:1 (i cant say exzactelly),,,,,,,,,,try to take it to 9.5:1,,,,,,,,,you have to skim the combustion chamber and head face for that , which is not as easy as you thing ,valve timing marks will also need to reset after that , and our mechanics have littel knowlege about that ,,,,later check the compression ration , search google how to check compression ratio of any engine,,,,,,,,,,,,,be prepared for rough engine idle after increasing compression ratio , its a -ve point but can be ignored ,,,,not a big issue ,,,,,,,,,,,second thing you have to enlarge the intake and exhaust ports,,,,,,,,need to do that with extreme care and accuracy without touching the valve seats ,,,,,,,,,,,,,another mod is to increase the efficency of carb second butterfly ,,,,,,,,,,,,i guess if you skip all other and do just this single mod than you can get a lot more from your car,,,,,,,,,,,,,i just do this single mod in my cultus and i wonder what result i get if i completelly rebuilt that engine for just performance ,,,,,,,,,,,,,,