pbeggs
Member
greetings!
my name is paul im new here but have been motorizing bikes since 2000.
my current project is a 1960's beach crusier bike with a 80cc "raw" frame mounted engine and a homebuilt jackshaft kit
this is my third build my fist kit was an island hopper friction drive unit ,.. on that i have about 2000 miles,..
after pedaling home in the rain a few too many times i decided to do a chain drive bike and got a angelwings 50cc bike ,..two rear wheels later i started working on a jackshaft. currently im in the final stages of building my second jackshaft prototype (test drive monday? waiting on the wheels!)
the bike,... typical murray beach crusier mid 1960's i think
ebay special was barely used and stored for decades,..
RAW 80cc motor with pull start,..
jackshaft 3/4 inch shaft,.. engine side 30 tooth sprocket on sick bike parts freewheel and freewheel adapter (modified for 3/4 shaft pedal side 36 tooth sprocket to a 16 tooth freewheel,.. inboard of pedal freewheel 13 tooth fixed gear (both mounted on a threaded adapter)
the 13 tooth fixed gear sends power of pedals and engine to a 8 speed sturmey archer internal gear hub with drum brake (25 tooth cog)
the jackshaft and gears work out to in first gear to be like a 60 tooth sprocket,.. in top gear (8th on hub) it is like a 20 tooth sproket mounted on the rearwheel i should have very good hill climb and high speed
anyone needing help with figuring gears out, my mechaninical drafting degree,.. and the two years i spent in engineering school make me very good at it,...
front wheel matching sturmey archer drum brake ,...
lights (dual engine powered) (white wire) with a small 6 volt battery being charged by a rectifier & regulator circut.
my name is paul im new here but have been motorizing bikes since 2000.
my current project is a 1960's beach crusier bike with a 80cc "raw" frame mounted engine and a homebuilt jackshaft kit
this is my third build my fist kit was an island hopper friction drive unit ,.. on that i have about 2000 miles,..
after pedaling home in the rain a few too many times i decided to do a chain drive bike and got a angelwings 50cc bike ,..two rear wheels later i started working on a jackshaft. currently im in the final stages of building my second jackshaft prototype (test drive monday? waiting on the wheels!)
the bike,... typical murray beach crusier mid 1960's i think
ebay special was barely used and stored for decades,..
RAW 80cc motor with pull start,..
jackshaft 3/4 inch shaft,.. engine side 30 tooth sprocket on sick bike parts freewheel and freewheel adapter (modified for 3/4 shaft pedal side 36 tooth sprocket to a 16 tooth freewheel,.. inboard of pedal freewheel 13 tooth fixed gear (both mounted on a threaded adapter)
the 13 tooth fixed gear sends power of pedals and engine to a 8 speed sturmey archer internal gear hub with drum brake (25 tooth cog)
the jackshaft and gears work out to in first gear to be like a 60 tooth sprocket,.. in top gear (8th on hub) it is like a 20 tooth sproket mounted on the rearwheel i should have very good hill climb and high speed
anyone needing help with figuring gears out, my mechaninical drafting degree,.. and the two years i spent in engineering school make me very good at it,...
front wheel matching sturmey archer drum brake ,...
lights (dual engine powered) (white wire) with a small 6 volt battery being charged by a rectifier & regulator circut.
