Im trying to learn how to put an engine on my mountain bike with a spring. I'm very new to anything like this and have no clue what im doing.

[k1ngkush]

I want to get a bike motor, some piece of crap off Amazon and put it on my mountain bike, but I need to figure out how to do it, help?

 

[cloakedvillain]

Pictures of the bike and a budget are the first things we would need to see. Those mystery kit china dolls aren't the best, a little bit more will get you one of the better made kits like something from zeda. Staton inc sells some great kits if you're looking for friction drive. Its honestly the easiest way, just attach it like a rear rack, twist and go.

If you are trying to motorize one of those Y shaped mountain bikes, you could get a friction drive kit but other than that you're sol.

New Zeda 80 Complete 80cc 2 Stroke Motorized Bicycle Engine Kit - Firestorm Edition

Your source for 2-Stroke and 4-Stroke Bicycle Engine Kits, Performance Parts, and Accessories!

www.bicycle-engines.com

 

[GW's Motorized]

Mountain bikea are among the harder bikes to motorize

 

[Amwicr]

Mountain bikea are amo g the harder bikes to motorize

It 100% depends...some are easier, some harder...if he puts it on a cruiser, he'll have to upgrade brakes(which is tricky to find U brakes that don't flex, and you can't use v brakes generally)

Also a decent old 90's cromo frame bike may well come with decent wheels, too, and with a 66ish cc motor there's no reason he couldn't use a rag joint.

tl;dr: mountain bikes usually come with better wheels, just don't use an aluminium frame bike.

 

[Amwicr]

I want to get a bike motor, some piece of crap off Amazon and put it on my mountain bike, but I need to figure out how to do it, help?

pics of the bike would be good, before you get the motor. Gotta see if it will fit and everything, and if the bike is up to it.

 

[GW's Motorized]

It 100% depends...some are easier, some harder...if he puts it on a cruiser, he'll have to upgrade brakes(which is tricky to find U brakes that don't flex, and you can't use v brakes generally)

Also a decent old 90's cromo frame bike may well come with decent wheels, too, and with a 66ish cc motor there's no reason he couldn't use a rag joint.

tl;dr: mountain bikes usually come with better wheels, just don't use an aluminium frame bike.

I used some old bmx u brakes on my cruiser build. They work good, but my wheels are the current weak link

 

[Sidewinder Jerry]

A GT STS mountain bike would be the best choice. I saw a frame on eBay for around $600. This is the best choice for an inexperienced builder.

 

[ImpulseRocket]

I want to get a bike motor, some piece of crap off Amazon and put it on my mountain bike, but I need to figure out how to do it, help?

If the frame of the bike is aluminum you will want to reconsider. It will work short term, but most aluminum frames crack a lot sooner than steel frames when motorized. There are some exceptions, obviously, but as a whole it's a good rule of thumb. Most of us have steel frame bikes for a reason.

 

[Sidewinder Jerry]

Found the perfect frame for you; act quickly. From what I can remember of these bikes the frame is aluminum but the rear stays are steel.

19" Vintage Specialized Ground Control Full Suspension Mountain Bike Rock Shox | eBay

Size is 17" (center of crank to center of top tube), 21.5" (center of crank to top of seat tube). Rear dropout spacing is 135. Takes 26" wheels. Takes V-brakes or cantilever brakes. BB and derailleur threads in great shape.

www.ebay.com

 

[Amwicr]

Found the perfect frame for you; act quickly. From what I can remember of these bikes the frame is aluminum but the rear stays are steel.

19" Vintage Specialized Ground Control Full Suspension Mountain Bike Rock Shox | eBay

Size is 17" (center of crank to center of top tube), 21.5" (center of crank to top of seat tube). Rear dropout spacing is 135. Takes 26" wheels. Takes V-brakes or cantilever brakes. BB and derailleur threads in great shape.

www.ebay.com

But as it has full suspension, the motor chain tension will continuously be changing, so he'd need to run a jackshaft, which might not be the best if he's a noob just looking to slap a motor on his mountain bike.

On the other hand, that kcvale bike is sooo hot...