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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

View Poll Results: what type of bicycle engine do you have
2 stroke bicycle engine 301 79.63%
4 stroke bicycle engine 66 17.46%
electric bicycle motor 6 1.59%
hybrid (more than one motor type) 2 0.53%
All the above 3 0.79%
Voters: 378. You may not vote on this poll

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Old 10-26-2010, 08:02 AM
Black_Moons Black_Moons is offline
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Join Date: Oct 2010
Location: Canada, Bc
Posts: 207
Default Re: Bicycle Engine

Heh. I think the problem is the 50CC rule, Now if they had a HP rule insted, it would make a LOT more sense to use a 4 stroke.. And would'nt allow you to just throw $600 at it and have an unlisenced 10hp 10,000rpm loud death machine, when it was rules aimed at little 2hp chinagirls.

Course, then the cops would need chinagirl dynos. :P Insted of.. uhhhh... the displace-o-meters they currently uhh, don't have!
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Old 10-31-2010, 08:43 PM is offline
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Join Date: Oct 2010
Location: Merritt Island, florida
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Default Re: Bicycle Engine

Talked to a guy today at Walmart - has a Staton 4-STROKE Friction Drive on a Mongoose.
He regularly rides it 20 miles each way to the VA Clinic. Not a young guy.
I'm thinking of fixing up my old mountain bike with one. A Ross Mt Whitney -- no suspension.
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Old 11-07-2010, 04:56 AM
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fishguts fishguts is offline
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Join Date: Sep 2010
Location: southeastern MA
Posts: 313
Default Re: Bicycle Engine

Originally Posted by marts1 View Post
Too bad that twist an go thing would make them illegal to ride where I live.
Now ain't that weird - that's the only kind that are legal here (MA).
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Old 12-08-2010, 09:50 AM
buzbikebklyn1 buzbikebklyn1 is offline
Join Date: Jun 2009
Location: Brooklyn N.Y.
Posts: 208
Default Re: Bicycle Engine

Make mine morini please
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Old 12-14-2010, 09:13 PM
Bulldogg at MAD Bikes Bulldogg at MAD Bikes is offline
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Join Date: Dec 2010
Location: Welches, Oregon
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Default Re: Bicycle Engine

[QUOTE=thatsdax;14584]The 2 strokes are lighter by a few pounds and can mount more easy between the crank for a better center of Gravity and cost less and have a life of 1000-6000 miles depending on how you treat them.

The 4 stroke is much smoother, much quieter, and the 4 stroke 48cc Titan will run with and even out run the 70cc 2 strokes. So when you consider the 50cc Titan with the 70cc Dax 2 stroke, the weight is pretty close. Also, when the life of the 2 stroke is nearing its end, the 4 stroke Titan is just getting broken in.Also since the 4 stroke mounts behind you, it allows you to install on a full suspension bike and makes for a super smooth ride, and it is even more quiet to ride with the motor back there, and there is nothing intrusive on the top bar or between your legs. Also.. The Titan 4 stroke is an automatic making for twist and go operation. Also, it makes better torque. Also, the Titan rear mount will allow you to mount to a step through frame making for easy mount and dismounts.

These 2 strokes do last a little longer then you mentioned. more like 7000 to 10,000 miles if treated with respect. But then again I have only the Grubee 66cc, 2 stroke GT5's (5 of them and all have over 7000 miles and all still running perfect, and I ride everyday.
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Old 01-19-2011, 10:26 AM
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F_Rod81 F_Rod81 is offline
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Location: Denver, CO
Posts: 1,033
Default Re: Bicycle Engine

I have had a number 2 stroke and 4 stroke engines growing up. I like 2 strokes a lot better, easy maintenance, and more power = more fun.

Last edited by F_Rod81; 08-11-2011 at 10:12 AM.
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Old 01-24-2011, 01:13 AM
buzbikebklyn1 buzbikebklyn1 is offline
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Location: Brooklyn N.Y.
Posts: 208
Default Re: Bicycle Engine

Over the years I've had both 2 and 4 stroke engines in my bikes.
I hate to say this in print, but the China doll does have several design flaws (mostly repairable or modifiable) and reliability problems if not fueled and maintained properly
(as do all small engines).
In this aspect, my friction drive,rack mounted 31cc Honda 4 stroke GX30 engine was easier to live with day to day than the average frame mounted left side drive china doll (if not a bit boring performance wise and ungainly in appearance).

This next part is purely subjective on my part so PLEASE don't flip out you 4 stroke guys out there!

Now we come to my real point, 2 strokes are just plain cooler than 4 strokes.
I find a 4 stroke has to have at least twice the displacement of a 2 stroke to generate any kind of excitement.
The current crop of 4 strokes available for M/Bs still look like weed whackers to me, and don't look like they belong mounted in a bike frame.
Whereas the China doll LOOKS like it belongs bolted into a bike frame(let alone the mighty Morini).
It all comes down to subjective choice...
I still like the china doll for its easy maintenance and repair ability, but it doesn't have the "holly s--t" factor of the Morini.
4 strokes have some catching up to do style wise before they attain the "cool" factor.
What ever you choose, ride it like you stole it, have fun and take care of it with regular maintenance.
Its a big sport/hobby with lots of room for personal interpretation...
Keep em shiny side up...
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Old 02-20-2011, 09:22 PM
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mopedjay mopedjay is offline
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Location: Haverhill Ma
Posts: 41
Default Re: Bicycle Engine

theres no diesel engine on there i wanna diesel bike
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Old 05-29-2011, 02:01 AM
nate-m nate-m is offline
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Join Date: May 2011
Location: Georgia
Posts: 13
Default Re: Bicycle Engine

<blockquote>In this aspect, my friction drive,rack mounted 31cc Honda 4 stroke GX30 engine was easier to live with day to day than the average frame mounted left side drive china doll (if not a bit boring performance wise and ungainly in appearance).</blockquote>

I recently switched out my china 2-stroke for a Honda 50cc on friction drive.

I'm happy with this decision. It's quieter, smoother, more fuel efficient, and doesn't smell as bad. I still like the 2-stroke though. I want to get another bike and put it on that.

The differences as I see it (not a mechanic type)

+ More powerful. 200% more power strokes per rpm. At higher RPM it's not that big of a difference though.
+ simpler
+ lighter.
+ smaller
+ cheaper
- likes gasoline a lot
- smellier
- noisier
- top end wears out faster
- sustained travel at (relatively high) speed wears it out faster
- must carry around 2-stroke oil. Unless you have oiling system (none of these kits seem to have that) then you need to premix gasoline in separate container (ideally)

- lower torque. Especially off the line
- more complex. You have the valve train.
- heavier
- typically more expensive
+ typically more efficient
+ quieter
+ less exhaust stink
+ longer times between overhauls
+ better at long distance at sustained speed
+ get gasoline at any gas station.

And it seems that 2-strokes are much more finicky with changes and fuel mixture. Like they will tend to foul plugs much easier then 4-strokes if they get out of tune. More sensitive to temperature changes (and other environmental factors) and jetting needs to be mucked around with a lot more. Although this could just because I have far less experience with small 4-strokes then 2-strokes. But I won't drive anywhere on a two stroke without having a extra spark plug in my bike's tool kit.

If you want something that is cheap, fast and good for jack rabbit starts. Fun and fast... then 2-stroke is where it at.

If you want something that will be traveling longer distances at sustained speeds then 4-stroke is what you want. Much more neighbor friendly also.

Last edited by nate-m; 05-29-2011 at 02:04 AM.
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Old 05-29-2011, 06:05 PM
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Mike B Mike B is offline
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Location: Central CA
Posts: 2,259
Default Re: Bicycle Engine

I like my Robin Subaru 33cc friction drive twice as much as my 66cc grubee.

Less power, less speed, less acceleration, but more fun -

It just purrs down the road smooth as silk. Of course there is a better bike under it too, but that is as it should be.
The only thing in my garage with 4 wheels is the lawnmower
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