WTB a good Motorized bike

[dpj247]

im looking for a brand new bike and engine all new. 50cc, and can go up to about 45mph. im spending $300-400$.
pm me if you have any to sell. If not please send me some links of places i can buy motorized bicycles for cheap or good bike kits.
Thanks

 

[Ibedayank]

Re: Buying a good Motorized bike

you want links... try the sides of this forum
$300 ..... only if you build it yourself
and want ads should be posted in the for sale section

 

[biknut]

Re: Buying a good Motorized bike

im looking for a brand new bike and engine all new. 50cc, and can go up to about 45mph. im spending $300-400$.
pm me if you have any to sell. If not please send me some links of places i can buy motorized bicycles for cheap or good bike kits.
Thanks

If you find one let me know. So far all my bikes end up costing more than $500, and only go 35 mph.

 

[dpj247]

Re: Buying a good Motorized bike

biknut why are they so slow? cant they go 45mph? whats the problem?

 

[nightcruiser]

Re: Buying a good Motorized bike

biknut why are they so slow? cant they go 45mph? whats the problem?

There is no problem, a stock 2-stroke kit is geared to go about 30-35 MPH when tuned up well. In the $300-400 range for bike and motor you are only going to afford a stock setup, if that. If you want to hit 45MPH you're gonna need to upgrade a few things and know what you're doing, that's for sure....

 

[dpj247]

Re: Buying a good Motorized bike

whats the difference between 2- stroke and 4- stroke? im interested in a faster bike... and do all the kits work on all bikes because i have a mountain bike and idk if the you need a certain bike for kits

 

[biknut]

Re: Buying a good Motorized bike

As long as your frame is 18" or more you'll probably be alright with a china girl style 2 stroke motor in a mtb frame. 4 strokes need more room, so that might be trouble without some extra skills. I think if you want a true bolt on kit, you're stuck with a 50cc or less 4 stroke.

Just about anything else you'll have to fabracate your own mounts. Harbor freight has some popular utility 4 stroke motors people like to use.

 

[biknut]

Re: Buying a good Motorized bike

whats the difference between 2- stroke and 4- stroke? im interested in a faster bike... and do all the kits work on all bikes because i have a mountain bike and idk if the you need a certain bike for kits

I'll be honest with you, if you're looking for dependable 45 mph running you'll be a lot happier with a small motorcycle, or scooter. Something around 100 or 150cc.

If you want a bicycle to last very long at those speeds, you'll need to replace and upgrade almost everything on the bike, especially the wheels and brakes.

 

[Nipash]

Re: Buying a good Motorized bike

I think you need to have a little change of plans......

This is exactly the same thing that I thought when I was first interested in getting a motorized bicycle. I actually wanted to go around 45 (because that is the speed limit of the only road into town) on my bike, so I didn't have the expense of insurance with a motorcycle. But, there are a few problems with that:

1. A regular mountain bike CAN go 45 in the same way a baby carriage CAN go 45 down a hill and off a cliff. Trouble is, that bike will not stand up to the abuse for extended durations, and most likely the frame will become soft (might even break), wheels will become loose and not to mention the bearings...

2. It is NOT safe to do that AT ALL. What sort of brakes to you have on your bike? If they are anything less than the mondo brakes you have on motorcycles you can be sure you definitely won't be able to stop quick. And what about tires? Most tires have a speed rating, but not tires for bicycles. You can be sure that if you kit a rock or any sharp object the tire will pop and you will be on the ground. And if you're not wearing motorcycle leathers at 45 your shirt WILL rip off and you will slide at 45 across the road on your bare skin.

3. What about legality? Most motorized bicycles are dubiously legal; and if a cop sees you fly by at 45 you can be definitely sure he is going to impound your bike at the very least. What if you get in an accident? The list goes on...

4. Bicycle engines simply do not have the power to go that fast. According to my calculations, you'd need about 6hp to go around 45 and that is flat out. The regular chine girl produces around 2hp (optimistic estimate) so there is a pretty large gap. There is a reason the specs sound so good on all the Chinese engine dealers' websites: They're lying! The only engines that have that much power are the Morini's or Briggs', and they either require the use of custom welding or cost over $600 for the engine only.

Sorry for being blunt, but I do not want to see anybody injured, or the reputation of the MB'er ruined by a freak accident. What do I think you should do? Look for a good, reliable, four stroke honda of subaru kit that will propel you up to around 25 and get around 100mpg, now that woud be a truly useful bike.

 

[dpj247]

Re: Buying a good Motorized bike

actually im looking for a speed of 30-40mph.. 35mph max. ill be fine with. I was wondering can i buy any kind of kit 49cc or 50cc 2-stroke. for my bike. i have 2 mountain bikes and 1 GT bmx bike. im going to try it on them all.

 

[Ibedayank]

Re: Buying a good Motorized bike

why not look through the mountian bike section and see what eveyone else has built

 

[dpj247]

Re: Buying a good Motorized bike

making one of these motor bikes. are they dangerous? like if i ride normally nothing should fall off or wheels pop?

 

[nightcruiser]

Re: Buying a good Motorized bike

actually im looking for a speed of 30-40mph.. 35mph max. ill be fine with. I was wondering can i buy any kind of kit 49cc or 50cc 2-stroke. for my bike. i have 2 mountain bikes and 1 GT bmx bike. im going to try it on them all.

I'm pretty sure it's been said here already, but a 2-stroke kit should have a top end of about 30MPH tuned reasonably well, 35MPH is not impossible with a stock kit, but you'd have to have her tuned up pretty damn well, and its not gonna be good for the motor to red line it constantly to achieve it...
The cheapest thing you can do to get a little more speed (beyond tuning her up really well) is put a smaller sprocket on the rear wheel. This will give you a little more top end speed but it might not run as smooth at lower speeds.
A new NGK BP6HS plug, quality plug wire and boot are also upgrades that make a big difference for a small investment. Beyond that you're talking shift kits, expansion chambers, etc, and more $$, or more expensive 4-stroke motors which require a lot more customization to install all adding up additional $$.
As far as kits go, they are all pretty similar, and can be a crap shoot with any of them. There are entire threads about "the best kit" you can read to help make that decision....

 

[Ibedayank]

Re: Buying a good Motorized bike

making one of these motor bikes. are they dangerous? like if i ride normally nothing should fall off or wheels pop?

not anymore dangerous then a car or just walking to the store.
It depends on how well you build the bike and how well you ride plus if you take stupid chances and ride like an assclown

build it right and ride safely!!! yes they are out to KILL you so ride like it and take no chances if the car don't stop you better cause in an accident the car will always win... Only you can choose what bucket your brain goes in... hopefully you wear a helmet so that bucket is not made by rubbermaid

 

[bigbutterbean]

Re: Buying a good Motorized bike

what we are telling you is, if you want a performance tuned motorbike, its going to cost you money, time, and possibly fabrication skills. is it safe for a motorized bicycle to go 40mph? not if its stock. after you get done spending what its going to cost you to tune your engine up, youre going to need to spend money on good brakes. drum brakes, hydraulic disc brakes, or even mechanical disc brakes. coaster brakes and rim brakes do not effectively stop a motorbike. sure, they slow you down, but emergency stops are very dicey with standard bicycle brakes. if you want a performance tuned motorbike that is safe and reliable, expand your budget. im getting ready to spend $500 or more just to install a shift kit and get some better wheels, and I already have a good chunk of change invested in my bike, which currently tops out around 30. listen to our advice. please dont think you can just make your bike do whatever you want it to when we are sitting here telling you that its not easy, cheap, or necessarily even safe.

 

[dpj247]

Re: Buying a good Motorized bike

well i want something simple. goes around 30mph. so a basic 50cc 2-stroke kit for my bike?

 

[bigbutterbean]

Re: Buying a good Motorized bike

you can do 50cc or 66cc, what the chinese call 80cc but is really 66. they make close to the same amount of power. installing the kit yourself will save you a lot of money, since you can get a kit on ebay for about 160 shipped. they are not too difficult to put together, but sometimes the instructions are not very clear. come here and ask questions and you will find all the advice you need. since you have a mountain bike, a shift kit is another option. its a kit that allows the engine to use the bicycle's gears. it takes a little more mechanical know-how, but perhaps there are forum members that live close to you that can assist you if you need help. if you have a full suspension bike, you may not have room in the frame for an engine. if there is a big spring directly under your seat. but if you have a hardtail, it shouldnt be an issue if the geometry of your frame is friendly to mounting an engine. it helps to have at least 18 inches of frame clearance. smaller frames have been done, but not without great effort and skill.

 

[dpj247]

Re: Buying a good Motorized bike

well im 16 and 50cc is the only legal one for me.

 

[bigbutterbean]

Re: Buying a good Motorized bike

a lot of people buy the 66cc and take the stickers off. thats what i did. cops or whoever aint gonna know the difference unless you tell em. some people even stamp their engines 49cc. i just took the stickers off mine.

 

[Len455]

Get the 66cc you wont be disapointed. I live in az and we have a 48cc limit but i ordered the 66 and when i got it there was not evan a way to tell what it was! The only reason i know its a 66 is because i beat my friend and his 48 in any race. So get the 66, dont tell anyone, have fun and be safe.
Best of luck, ben