Motorized Bicycle Engine Kit Forum - DIY Home Built Motorized Bicycle (non kit)

Is this CRAZY???

SPENCER15 — Thu, 19 Nov 2009 22:08:26 GMT

Ok so i want to build a moterized bike and i thought it would be awsome to take a shifter kit/JAck shaft from sick bikes parts but instead of having the chain go into the frame i would have it go out the to the back rack where i would have an engine mouted, i thnk about 4 horse...OR is the shaft from the engine spun the right way i could go strait to a free wheel on the front sprocket. Is this a good idea.bt.

Can anyone help me here?

sona1111 — Wed, 18 Nov 2009 20:10:37 GMT

well, basically, i bought an electric scooter years ago, and the steering system broke so its been sitting there for a while. mainly i use a bike with 3 gears in front and 7 in back. i took apart the scooter and safely obtained all of the electronics from inside. so i already have a speed control handlebar (not sure how to attach this) the controller, batteries, and the motor. (and some lights and stuff) all of this is in working order. i also took the chain that attached the motor to the scooter wheel and the back wheel itself. i could get the gear off the wheel, but not the freewheeling part. (its pretty much welded to the wheel or something, i still have it if anyone has ideas of how to remove it) it turns out the chain is weird (i don't know many bike terms yet XD), its teeth are closer together then a standard bike gear/chain.

so i am wondering whats the best way to go about attaching this to the wheel. from what i have seen online, the most common way is buying a "southpaw freewheel" to attach to the left side of the back axle. however im not sure if this would fix my bike or not, and i am on a tight budget so i do not want to waste money. how can you tell if it would fit? also, how can i buy a matching tooth size gear to put on the motor shaft? i found out this is the motor i have online: >had to remove link because of forum<

i tried to contact this company to find out if they have any optional parts to put on the motor axle, but they have not responded as of yet.

the batteries (theirs two) weigh about 17 pounds, and i have found a read rack online that can take about 25 pounds, so i figured i could just use a few hose clamps to keep them in place after i order it.

so basically i can either find a way to attach this gear to my bike, and keep the motor and its gear, or if the company responds or you guys know where i can get a replacement gear, i can attach a southpaw freewheel and run that to the motor. (preferred) how would i go about mounting this motor and/or gear? i do not own any welding equipment, but i do have a large amount of hardware at home (nuts, bolts, and plates of all sizes). is it possible to attach the motor securely enough with nuts and bolts to withstand the pressure of bumps in the road and the torque of the motor?

i hope i have explained everything clearly, and i can take pictures or measurements if needed, thanks alot in advance for reading and helping.

My Briggs Powered Bike

MarksA-C — Wed, 18 Nov 2009 07:17:18 GMT

Hello everyone. I decided to post a thread of my motorized bike I'm currently building.

It was a Schwinn girls bike and now its an almost usable awesome motorized bike! Like I said, it was a standard girls bike, I cut out the top bar, used a piece of the top bar and stretched the bottom bar 7" (Approximately) and then made a nice curve top bar with a piece of scrap pipe (Beating it against the ground) and then making the motor mounts! Top bar should have a bit more of a curve, but I don't feel like cutting it out and trying again. The motor I'm using is a 3 Hp Briggs and Stratton engine I got a few months ago. It was seized, but I was able to bring it back from the dead and it works better than ever! I still don't know about the final drive. I know there is going to be a jackshaft and clutch but I don't know about the final drive.

Girls bike before...

This is how far it is now.

I will get more pictures as the project goes on.
Mark-

usflg

Oldwheeler

Oldwheeler — Wed, 18 Nov 2009 06:58:34 GMT

Hello! I'm a 74-year old man getting back to my boyhood. In my teen years, boys took old gasoline engines and put them on bicycles and made motorbikes. I couldn't afford them back then, so now that I have time and occasional spare cash, I plan to make up for it. Besides, I can't afford a Harley 45, or an Indian Scout. "Make" magazine directed me to this website, and I expect to get a lot of information and enjoyment from it.

Building a bike for wet/snowy conditions...?

haydenslides — Mon, 16 Nov 2009 05:36:20 GMT

Wow, new to this forum and stoked!
I'm going to build a motorized bicycle with a Husqvarna 142 chainsaw engine.... I have a few questions!

I have a couple of requirements for this bike: #1: Needs to be able to work in wet conditions and snow. and #2: I still want to be able to pedal the bike.

So, my first question is how well does friction drive work with a tire slicked up with snow or water?
This is my only fear of using a friction drive setup. At this point I am unsure as to how I would attatch a roller to the clutch drum. Any suggestions? If i go this route, i'm thinking of using a urethane skateboard wheel with grit glued to it.

My second question is how would i set up a chain drive setup (possible even? )that would still allow me to pedal?

I'm going to be building this bike for accessing terrain for skiing that is on closed, gated roads...as far as snow riding goes it will be just having to cross patchy snow sections on gravel roads, not long sections of snow.

I'd greatly appreciate any info the gurus might have....wee.

STIHL chainsaw motor ms440 will it work?

Microwaveman — Fri, 13 Nov 2009 23:45:40 GMT

I have the motor and I am new to the whole bike + motor thing... would it be a dumb I idea to mount the ms440 on a bike. I'm a need for speed kinda guy and I know that chainsaw has some big power would it be possible to do this? and if it is possible how fast could I run the bike I know this motor is 71cc Engine Power: 4 kW (5.4 bhp)

weedwhacker question

deacon — Thu, 12 Nov 2009 15:26:48 GMT

Okay
I have used weed whackers previously as friction drive motors. I had less than perfect results due to vibration problems. But that is not todays question.

I plan to build a DIY generator using a scooter motor, as a generator, a #25 chain, and a weed whacker engine. I plan to mount them both together. I am first going to try doing it eliminating the batteries completely. Run the electric drive of the bike directly from the generator. I read that diesel locomotives do not run from the diesel engine. That engine turns a generator which powers an electric motor. The reason is so that the power can be applied to the drive wheels more precisely than any clutch could. If I can make this thing work, there would be no need for shifters or gears. You do not need them on an ebike if it has enough power. If I can't get it consistant enough then I can at least charge the batteries while I ride to increase the range a bit.

For it to work even a little consistently I need the weed whacker to turn the motor at pretty much the same speed all the time. I'm not sure that a weed whacker is capable of that for say thirty minutes at a time.

I don't think turning the scooter motor will be much more strain than turning the cutting head in a weedy lot. However I wanted to get your opinions.

http://i36.tinypic.com/15pk605.jpg

I was at wallymart this morning and found a 25cc blower for 68bucks. I wonder if that will turn the scooter motor fast enough. I wont need a clutch but maybe an electrical switch to interrupt the current flow to the bike motor.

craftsman weedwacker

trimguy247 — Wed, 11 Nov 2009 01:10:46 GMT

ya just built my first friction drive. took a weedwacker motor and welded a plate to the front fork and bolted the motor on with the throddle opened with a spring use a kill button to slow it down works great but nothing like a china girl

Tryin to figure out how to put a motor on this bike:

george_n_texas — Tue, 10 Nov 2009 01:39:36 GMT

Can someone help me figure out how to motorize this bike?

The Treadmill Bike

Lookin' for a project

deacon — Mon, 09 Nov 2009 19:11:38 GMT

never mind....

stuck motor old briggs

motor_head — Sun, 08 Nov 2009 02:50:08 GMT

well i found a cool old motor it's a wmb briggs and stratton made in '57(think thats
what the tag said).
i have gotton the crank freed but the piston won't budge all i can do is rock the crank back and
forth a little.so i was wondering what the best thing to try to free it with is

hoping to put it on a bike on a website it says 1/2 hp but it was probably rated pretty modestly
and with a better carb should put out 1-1 1/2 hp in todays rating

Custom frames.

marsrover — Thu, 05 Nov 2009 23:20:06 GMT

Seems all the people here need fresh ideas.
Atomic Zombie Recumbents, Trikes, Choppers, Scooters and Electric Bikes Homebuilt DIY Project Plans
I got their book for free.
But due to coppyright problems i can't leagly post the link.
Google may help.

Starting Greyhound Build

Elmo — Thu, 05 Nov 2009 21:07:29 GMT

Well I have one of those 79cc HF Greyhound engines so I thought I would build a bicycle for it. I have acquired 2 of the inexpensive mountain bikes as donors. I intend to cut 1 behind the seat post and the other in front of the seat post amd join them together with tubing so I would have an easy place to mount the motor. Sort of a mid engine deal. .weld.spr.scratgThis MB will be my winter project. I want to use a centrifigal clutch and gear it so it will hit 30 mph at 4000 rpm.
Elmo

Lifan with a bar mounted shift system, possible?

pedro5189 — Thu, 05 Nov 2009 06:11:49 GMT

I've just had an idea,

How about a semi auto lifan with the gears being controlled by a regular handle bar mounted thumb shift. some sort of armatures off the end of the gear shaft with your right hand operating up and your left hand operating down. The rachet system with in the levers would need removed. Or because a lifan (or at least sum) have that strange gearbox where you shift up (or down by foot) from forth and it takes you straight back to neutral, meaning you could do it all with just the one lever.

What do you think?

I know lifans are wide but the are always ways around that, btw how wide are they?

Titan In Frame Shifter

NEAT TIMES — Wed, 04 Nov 2009 04:38:47 GMT

HAVE MY INGREDIENTS ALL ON ORDER, MOST OF IT IS HERE. I THINK I HAVE IT ALL FIGURED OUT. SHOULD BE AN EASY BUILD. I THINK IT WILL BE TROUBLE FREE AND DEPENDABLE LIKE THE TOP FRAME SHIFTER BUILD. I HAVE SOME DIFFERENT , CLEANER IDEA`S FOR IT ALSO. HAVE HAD A WEB SITE FOR OVER A YEAR. OVER 6000 HITS AND HAVE NOT TOLD ANYBODY ABOUT IT. PUT SOME UGLY PICS ON IT, NEED TO CLEAN UP THE PICS. HAVE NOT BEEN IN A RUSH. JUST RETIRED IN JUNE. WILL BE A FEW DAYS BEFORE I HAVE PICS OF THE INFRAME. BUILD. HAVE SENT PLANS TO SOME MEMBER FRIENDS. THEY THINK IT IS THE BEST SYSTEM THEY HAVE SEEN FOR A SHIFTER, 6 AND 7 SPEED. USING SBP SHIFTER PARTS. THEY ARE THE GUYS THAT STARTED THE SHIFTER CRAZE, TO MY KNOWLEDGE. THATSDAX IS ONE OF THE FEW SELLING THE TITAN. I HAVE 3 OF THEM. ONE ON MY CVT FREE WHEELS BUILD, ONE ON THE TOP FRAME SHIFTER AND THE 3RD ONE WILL BE IN THIS IN FRAME SHIFTER. I STARTED BY BUILDING MY OWN DIY FRICTION MOUNTS. I STARTED THE FRICTION DRIVE THREAD MY FIRST DAY ON THE FORUM, IT HAS DONE WELL, FAIRRACING31 (MODERATOR & WINNER OF THE DEATH RACE OCT 31, 09) INFORMED ME RECENTLY THAT IT IS ONE OF THE LONGEST THREADS ON THE FORUM!! WILL POST PICS OF THE INFRAME BUILD AS IT PROGRESS`S ENOUGH FOR PICS . RON .cvlt1

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