Commuting - Built a Motorized Bike this Weekend.

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.




theden
04-04-05, 11:16 AM
Hey guys.

Well, I built up a motorized bike this weekend that I have been planning for a while. I can post a pick in a couple days, but I used a used cruiser and a 48cc motor kit, like they sell here: www.motorizedbikes.com . I found the kit at www.birddogdistributing.com for $177 to my door, and the used bike put me back $60, plus a couple bucks for a new throttle cable, and two longer bolts... Total cost around $250.

Anyway, it was originally meant for my wife, but it is a little finicky two-stroke motor, single-speed, with a motorcycle-like clutch and throttle. Seems a bit too tempermental for her. Anyway, it fired right up on the first try, and seems to be breaking in well. I have about 10 miles on it now, and have ridden up to about 20 mph, with atleast 1/3 throttle left (no need to work it too hard at this point). My Cateye computer works fine with the motor off, but is getting some interference with it running -need to figure that out. I know I am not going 60 mph! :rolleyes: It climbs moderate hills, but bogs down on steeper ones. I can help this a little bit by getting a larger drive sprocket, but that limits top speed a little, so no changes for now.

All in all, I would definitely say it was worth $250. If I can get a few thousand miles out of the motor, the gas savings alone will pay for it (by using the motorbike instead of the car). This thing is definitely inferior to my normal commuting bike, and won't be used daily. More like for short trips to the store when my legs are too tired from the days' commute.

It is definitely a good alternative to car though in some situations, but a regular bike is still ideal. Still a fun little toy though, kind of a poor man's motorcycle. :)


kf5nd
04-04-05, 02:14 PM
wrap the cateye pick-up wires with aluminum foil, and ground the foil to the bike... or go whole hog a splurge on a piece of shielded cable. The wires are picking up spark noise, the wire needs to be shielded from the spark energy, which is RF

theden
04-04-05, 02:22 PM
Peter,

Thanks for that information, I'll give it a shot tonight. It would sure be nice to know how fast I am going...


rykoala
04-04-05, 02:42 PM
That is VERY interesting. Neat kit! I wonder though, how does the cog attach to the rear wheel? That is a little puzzling.

theden
04-04-05, 03:36 PM
The drive sprocket for the motor attaches on the outside of the rear spokes, using rubber washers and 9 bolts/nuts. Definitely works best with a 36-spoke count wheel. You need a strong wheel to mount it on, since it is doing all of the pulling from the spokes themselves. Not an ideal way to do it, but short of building a dedicated wheel for this application, it's about the only way to go. I haven't had any problems yet, and the wheel remained true during installation. A friend of mine has about 2,000 miles a rear wheel -so far so good.

jeff-o
04-04-05, 04:08 PM
Heh, the kit mounted into a chopper-style bike is awesome. :D

slvoid
04-04-05, 04:49 PM
Nice...motorcycle? :)

jeff-o
04-04-05, 08:01 PM
moped.