2-Stroke Gas Bike Build

[Adirondackstihl]

Thinking on my Halo Sondre... but I’ve got a suspensionless diamondback in the basement I can start with...
I don’t ride it now... with a motor, hell yeah!!!


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Same here Hombre!!

 

[SOS Ridgerider]

Got any old cruisers kickin around the shop Sondre?
I’ve got a vintage TREK Singletrack that could use a motor

We could have races in Greenwich

I’ll take a look in the basement at the shop. We just donated a bunch of bikes to a non profit in Hartford, so we might have slim pickings. There’s usually something down there, though. The Trek will do just fine. I’d just make sure the brakes work properly.

Thinking on my Halo Sondre... but I’ve got a suspensionless diamondback in the basement I can start with...
I don’t ride it now... with a motor, hell yeah!!!


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The old rigid bikes are the best for this kind of project, so your old DB will do just fine.
I’ve worked on quite a few of these converted bikes. Unfortunately we have to turn most of them away, as we don’t have insurance to work on anything motorized. We’re also not set up to deal with gasoline spills etc.

Thengine puts a lot of extra stress on the bikes, and keep in mind these things weren’t meant to have engines, so the parts on them reflect that. They are a lot of fun, though, and like with everything else in the world; if you use common sense you’ll be fine.

 

[paragonbuilder]

I’ll take a look in the basement at the shop. We just donated a bunch of bikes to a non profit in Hartford, so we might have slim pickings. There’s usually something down there, though. The Trek will do just fine. I’d just make sure the brakes work properly.


The old rigid bikes are the best for this kind of project, so your old DB will do just fine.
I’ve worked on quite a few of these converted bikes. Unfortunately we have to turn most of them away, as we don’t have insurance to work on anything motorized. We’re also not set up to deal with gasoline spills etc.

Thengine puts a lot of extra stress on the bikes, and keep in mind these things weren’t meant to have engines, so the parts on them reflect that. They are a lot of fun, though, and like with everything else in the world; if you use common sense you’ll be fine.

Any thoughts on good kits?


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[SOS Ridgerider]

Any thoughts on good kits?


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Not really. Lol

All the stuff I’ve seen is usually from eBay or some other online source.
The only kits we have in our catalogues are battery powered

 

[paragonbuilder]

Not really. Lol

All the stuff I’ve seen is usually from eBay or some other online source.
The only kits we have in our catalogues are battery powered

Okey dokie...
eBay it is! [emoji41]


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[CR888]

I was thinking with these new electric bikes that look almost like a regular bike you would fit/add a 2smoke kit to one and have two power sources.....and plenty of torque.

 

[Adirondackstihl]

Okey dokie...
eBay it is! [emoji41]


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You gonna port it Dan?

 

[Terry Syd]

I first got interested in the motorized bicycle idea back in the '60s. There was an exchange student from Africa that brought one over with him. The engine sat over the front wheel and had a friction wheel that engaged against the front tire.

He drove it everywhere, using 20 to 1 motor oil as the pre-mix. He had to take it apart every now and then to clean the carbon out of the engine. No clutch on the engine, all he did was peddle it up to speed and lower the engine onto the front wheel - and off he'd go.

 

[Red97]

I have one of these...

Made an intake, and adapted an hda carb and 357 elbow/filter

My slide carb was defective out of the box. And who wants to fiddle with jets when ya can turn a screw.

I heard these China kits are all 66cc regardless of how they are labeled. I know mine was listed at 80cc but is indeed 66cc.

Can get close to 30mph with a cheap mountain bike and knobby tires plenty fast enough.

Have an old huffy to build up next with the 3 speed hub, that one is getting a jackshaft kit so I can bang gears lol.

 

[Red97]

Forgot I still had it up at the work apartment. Lot more efficient that a 1 ton truck for 1/4 mile trips. Guys at the shop love riding it around. Cheap/stupid fun till ya start buying go fast stuff...

 

[Terry Syd]

Have an old huffy to build up next with the 3 speed hub, that one is getting a jackshaft kit so I can bang gears lol.

The jackshaft concept I hadn't heard of before. Crikey, I've got a 7 speed hub that I can use - this could get dangerous real fast!

 

[Red97]

The jackshaft concept I hadn't heard of before. Crikey, I've got a 7 speed hub that I can use - this could get dangerous real fast!

Replace the crank with a free wheeling one, use the jackshaft to spin the crank sprocket. Use the bike Chain to run the gears. Can use a derailer to get a lot of gears...

Brakes and bike chains become the issue. Those hubs don't like power shifting either.

 

[Stihl working Hard]

I don't normally work on the kitchen table, but special times call for special measures

You are the second person I know Brad that’s allowed to work on an engine on the kitchen table the other person is @chipper1 but he’s not recovering from surgery

 

[Red97]

I wonder if they would require a safety inspection to register it? I highly doubt you would ever get any trouble from a cop though. I wouldn’t even worry about it.

What I want to know, is do they make a gearbox and clutch for these, to replace the centrifugal?

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They have a normal slipper clutch.

Pedal/dump the clutch to turn the engine over, pull the clutch in to stop. Stock gearing it can get my 280lb mass going with minimal peddling.

Now until you get all the bugs worked out don't travel further than you want to peddle back.....

The kit engine /chain adds a lot of mass to a pedal bike...

 

[Terry Syd]

I've got a hardtail with a seat post, but the jackshaft concept could allow you to use a bike with rear suspension.

I better not build one of these things, I can see myself already spending heaps of time and money to try and create something between a mountain bike and a motocross bike.

 

[Red97]

I've got a hardtail with a seat post, but the jackshaft concept could allow you to use a bike with rear suspension.

I better not build one of these things, I can see myself already spending heaps of time and money to try and create something between a mountain bike and a motocross bike.

They have em.

 

[Red97]

I've got a hardtail with a seat post, but the jackshaft concept could allow you to use a bike with rear suspension.

I better not build one of these things, I can see myself already spending heaps of time and money to try and create something between a mountain bike and a motocross bike.

See

 

[blsnelling]

After tons of research, the best kit for the money that I have found is a Zeda 80.

http://www.bicycle-engines.com/Firestorm-Z80-Complete-80cc-Bicycle-Engine-Kit.html

These engines are not all the same size. The bore varies from 40mm to 47mm. The stroke varies from 38mm to 40mm. Also, there ar 85mm rods and 89mm long rods. The Zeda 80 is a long rod with a 47mm bore and 40mm stroke which gives a displacement of 69.4cc. The shorter 38mm stroke gives a 65.9cc displacement.

 

[Red97]

After tons of research, the best kit for the money that I have found is a Zeda 80.

http://www.bicycle-engines.com/Firestorm-Z80-Complete-80cc-Bicycle-Engine-Kit.html

These engines are not all the same size. The bore varies from 40mm to 47mm. The stroke varies from 38mm to 40mm. Also, there ar 85mm rods and 89mm long rods. The Zeda 80 is a long rod with a 47mm bore and 40mm stroke which gives a displacement of 69.4cc. The shorter 38mm stroke gives a 65.9cc displacement.

That was what I was getting at. It lists 80cc on most of them, but 66/69cc is all the big ones are.

Either way lots of fun. You will enjoy the build no doubt.

I got 5 cylinders for 60$ lots of different ideas to play with.

 

[blsnelling]

Yeah, they call them all 80cc for some reason, although none of them actually are.