For a S6 Sport pro ? 20 for racing, but 16 for road use. The C 20 is a 14,000 rpm hooligan. With a stock crank - it's too much. Far too much.
Yeah for road use, I haven't got my 70cc kit yet but seeing as it's £180 new £70 was a good deal, could I just keep my s6 rep exhaust when I get the 70 put on? I'm not going to run my stock crank my bikes done over 20,000 miles maybe even 30 lol only about a month left till I upgrade everything though
70 is indeed a good deal - but you would need a strong crank, at least a stage 6 sport pro cylinder and a 21 mm carb. You'd need a box of jets from 90 to 130 and you'd need to remove the snorkel from the air box. You'd also need a significant quantity of rollers, very probably a Top perf transmission case with needle bearings, at least a Malossi Multivar variator and a decent clutch. You would need to be able to set that little lot up - and you would need to live somewhere where there were no police- because whatever silencer you put on it, it would make a helluva lot of noise. Are you ready for all that? I actually have an engine like that and, yes, it's fun. But it's a lot of hassle. Yes, it´s insanely fast. But for every day use I quickly get tired of it and put the stage6 with the yas R back on. i have seen the graph of the sport pro with the Yas 20 and it's definitely a beast. But at 14000 rpm. And that requires a lot of attention.
I've got a lot done to the bike, only things I can do to it now is 70cc, crank, carb and gear up. This is what I'm getting; http://www.pedparts.co.uk/product/542/stage6-cylinder-kit-streetrace-70cc--aerox-minarelli-lc http://www.pedparts.co.uk/product/1217/motoforce-evo-crankshaft--aerox-minarelli-10mm-pin http://www.pedparts.co.uk/product/515/stage6-primary-gearing--aerox#
