Hey back again after a while.
Putting up my latest project, a ground up very fast 4T scooter build.
I bought a crap chinese scooter from trademe for $54 dollars that wasnt working, but it had what i needed which was an un bent frame and a GY6 50cc engine case that wasnt wrecked.
i started by ripping the engine right down for a blue print and full rebuild with new (non chinese) parts. i dremmeled out all the machining marks in the engine case and grinded all the oil tracks to the honda GY6 spec cleaned it all up so it was all nice and tidy.
Ordered all the internals which was a new crank from scooter attack in germany, the cylinder is a 90cc made by BGM with a super corsa piston, head is a performace variant with big valves and larger porting and a race cam shaft also from BGM in Germany.
Put the engine all back together checked timing and valve gaps. Now coming to the carb it was difficult as i could not find a matching intake manifold for the carb to the head that was a 21mm, so a i bought one that matched the head and modified to suit but filling with JB weld and port matching to the carb with a custom made insulator.
Gearbox being a CVT needed an overhaul so a new sport variator from Naraku in Japan that is designed for modified engines above 72cc, the clutch needed to be good to cope with the power to the wheels, so a RMS racing clutch with adjustable springs which i have set to release at 3000rpm, also fitted a heavy duty contra spring and racing clutch drive plate for better acceleration. replaced all the bearings in the final-gear box that i sourced from SKF and filled with motul performance GB oil.
Still need to make up the loom for the scooter but i have already got a racing CDi and racing coil for a Yamaha scooter, a new Trailtech vapour will be hard wired into the loom with an RPM guage and engine temp, also got a digital rectifier from KOSO to help with getting the right voltage through the system as the chinese ones suck, tail light to be fitted is from an 07 ZX-6R and still deciding what to do for the front.
Frame has been cut up and re-weled as its going to have a naked rear end. fuel tank has been lowered to allow for a lower seating arrangement, handle bars are to be replace with a downhill mountainbike set up, so it should have a good setup for knees down scooter riding lol. Brakes have been tidied up and have fitted braided lines that my friend made up with earls fitting and airoquip lines, Suspention on the front was rehauled with new valves and oil and bought a YSS racing shock for the rear also got some new wheels as the others were fckucked and fitted some nice michelin S1 scooter tyres.
Still a bit to do with the welding and electrical, gota put the gearbox together and get the engine started but ill keep everyone posted as i update everything. and if anyone asks why a chinese scooter, well the answer is that parts for the engine are cheap and easly available, and the only chinese left is parts of the frame and the engine casing, otherwise its german, japanese and a bit of kiwi.
Originally Posted by gatch
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