Decided to build a Motor Bike (But budgets low)

[TonyGotSkilz]

Ok so i've decided to build a Motorized Bike to commute my 9 or so very hilly miles every day. I haven't ridden a bicycle in a few years (but its like riding a bike right? j/k) but i did own a motorcycle for quite awhile up to a year ago and loved it.

My budget is only about $200-250 and so far i've seen some kits on Ebay for $120 and i've got someone who will install any kit for $25 so i'm looking on Craigslist for a $50 or so bike. I was just wondering if anyones had any experience with the E-bay kits cause i'm a bit warry.

I've spoken to a local guy (to San diego) and he has a small business selling these kits and bikes and he says he can sell me the best/faster 80CC motor you can get for $160 and he'll bore out the carbs (cause he says they come with barbs and rough edges on most kits) and add some extra needed o-rings and stuff for that price. He sounds pretty legit, and says he's tested 12 different engines and now thats the only ones he uses (he's made tons of motorized bikes) so i'm thinking about going that route. The only advice i've gotten so far was to get a bike with cantelever brakes so i'll actually be able to stop from 30-40 mph safely.. Any other advice or knowledge would be appreciated. Oh and my names Tony btw if you haven't figured that out yet. Thanks all.

 

[Mountainman]

My budget is only about $200-250 and so far i've seen some kits on Ebay for $120 and i've got someone who will install any kit for $25

welcome

HT dealer close by here sells MB's complect for 300 dollars
PM me if interested

what a deal -- 25 dollars for an install !!

makes it good to ride that thing

 

[bluegoatwoods]

However you do it, I'd avoid the ebay sellers. You just don't know who you're dealing with.
And you can get just about the same price from trusted mbc vendors. Links on the left of these pages.

You've got just about enough money to build yourself a bike with a two stroke, frame mount engine. There's some other stuff you'll want to add, but they can wait a little bit.

So I'd go ahead and do it. I doubt if you'll regret it.

 

[will_start]

My one piece of probably bad advice, use super-glue everywhere.
For me, It prevents things falling off.
these motors viabrate the bike lots,
and in my humble expensive glue costs money,
and runs out.

Read the stickies in each area, they help lots.

 

[wheelbender6]

Buying an engine kit in your budget should be doable. I spent very little on my engine kit and it has been reliable enough for 50 mile round trip commutes to work a few times per week.
Since you are in a hilly area, your rear sprocket should be at least 40 tooth. Good luck.

 

[Hawaii_Ed]

Man, save the $25 and do it your self. These kits are not that hard, and the reward of building it yourself is worth it. Any obstacles you hit we can help ya overcome And worse case, if you just can not figure it out, then you can take it to your guy.

 

[duivendyk]

If you have hilly terrain,a single-speed setup is unlikely to cut it!.You need GEARS !.SBP has a kit you can use in conjunction with derailleur or geared hub.But without gears you're either geared too low for the flats or to high for the steeper hills.

 

[hurricane billy]

how well or sould i say how easy are the kits to use with say a 3speed hub?
i know have a beach c with 80cc 1sp . info on gears would be helpfull...

 

[duivendyk]

The SBP kit is intended for a bike with a front derailleur setup with a jackshaft driving the large chainwheel and the small driving the rear wheel sprockets.Shifting is done with the rear derailleur but could also be done with a multispeed internal hub(expensive ).You need a freewheel crank at the front,check out Sick Bike Parts.

 

[duivendyk]

TGS,I did some number crunching,to see if you might get away with a single speed drive or not,which would be cheaper of course.The answer is maybe,it would help if you got an 80cc HT engine,you need all the torque you can get (torque is pretty much proportional to displacement) so the bigger the better.I think they have a 4:1 reduction built in .With a 12/44 (12T ? output sprocket) reduction to the rear wheel you have an overall reduction of 14.67 which means a speed of 25mph at 5 k rpm and should be able to get up a 5-6? % grade.assuming that you + bike don't weigh more than 275 lbs.Use a 'clamshell' rear wheel sprocket mounting bracket instead of that through the spokes clamping abortion.