L
luke_mcmahon85
Guest
hi! this is my welcome post, i really really want to post pictures of my project, but alas, have just joined this site, tommorow i will put some up. i'm really dissapointed i only just found this site, as i'm almost finished my build. i'm also dissapointed that i went the hard way to making a motorised bicycle, i only realised there were kits to do this type of thing a little while into my build (after i had bought the bike and engine) oh well...maybe next time.
given that i was unaware of the kits that seem so popular on this site, i simply bought an old 60's or 70's dragster bike (that's what we call them here in australia, i guess it's the same in the US) and a 49cc engine off a chinese pocket bike. i then modified the frame and welded on engine mounts etc. also given that i'm not a big fan of exercise, i did away with the pedals all together. so i have the engine mounted in the frame, with a tiny sprocket from the left hand side having a chain going to a large sprocket welded on to where the left pedal would be, and then where the right pedal would be, there is a small sprocket that leads a chain that goes to a large sprocket welded onto the rear hub...which is a sturmey archer 3-speed internal hub, which i'm hoping will give me 3 gears. this way i have enough power to take off and still get a reasonable high top speed, all without pedalling. the engine has a centrifugal clutch, and a pull start, so i'm hoping to get the idle and clutch adjustments right so that i will be able to bring the bike to a complete halt, and keep the engine running, just like a motorbike or a go-kart....
i have had it running, and it takes off fine, and is quite fast (haven't got the gear changer hooked up, so this is all in 1st) but i keep munching the funny rear grooved washers that are used to hold the hub in place (these seem to be unique to SA rear hubs so if it continues i mihgt have to go with a fixed gear rear hub...ah well). anyway, i will post pictures tommorow...
given that i was unaware of the kits that seem so popular on this site, i simply bought an old 60's or 70's dragster bike (that's what we call them here in australia, i guess it's the same in the US) and a 49cc engine off a chinese pocket bike. i then modified the frame and welded on engine mounts etc. also given that i'm not a big fan of exercise, i did away with the pedals all together. so i have the engine mounted in the frame, with a tiny sprocket from the left hand side having a chain going to a large sprocket welded on to where the left pedal would be, and then where the right pedal would be, there is a small sprocket that leads a chain that goes to a large sprocket welded onto the rear hub...which is a sturmey archer 3-speed internal hub, which i'm hoping will give me 3 gears. this way i have enough power to take off and still get a reasonable high top speed, all without pedalling. the engine has a centrifugal clutch, and a pull start, so i'm hoping to get the idle and clutch adjustments right so that i will be able to bring the bike to a complete halt, and keep the engine running, just like a motorbike or a go-kart....
i have had it running, and it takes off fine, and is quite fast (haven't got the gear changer hooked up, so this is all in 1st) but i keep munching the funny rear grooved washers that are used to hold the hub in place (these seem to be unique to SA rear hubs so if it continues i mihgt have to go with a fixed gear rear hub...ah well). anyway, i will post pictures tommorow...