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Pre-Motorized Bicycle Information. Before you mount that engine to your bicycle frame, you'll want to know if the bike is ready for the engine! Ask our experts here for advice on what motorized bicycle engines perform well on what bicycles.


2 stroke Vs. 4 stroke

Before you mount that engine to your bicycle frame, you'll want to know if the bike is ready for the engine! Ask our experts here for advice on what motorized bicycle engines perform well on what bicycles.


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  #1  
Old 04-14-2009, 01:37 PM
MFC7548 MFC7548 is offline
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Default 2 stroke Vs. 4 stroke

hey again just another question from a newbie what the difference between 2stroke and a 4stroke engine? im trying to figure out what type of engine i should get what what the pros and cons are fron each
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Old 04-14-2009, 04:49 PM
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Default Re: 2 stroke Vs. 4 stroke

2 cycles use a gas/oil mix to run and lubricate, vibrate a lot, the exhaust has fuel particles in it (spews oil) (the frame-mount 2cycle(chinagirl), is cheaper and shows it in the qc from the factories)

4 cycles use plain u/l gas, have an oil fill, smoother running (minimal vibrations), cleaner exhaust
(most 4cycle kits use better quality engines and usa-made parts for the gearbox, mount...etc)
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Old 04-14-2009, 11:49 PM
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Default Re: 2 stroke Vs. 4 stroke

o you forgot the 4-stroke cost double what my 2-stroke kit cost
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Old 04-15-2009, 09:50 AM
Weedylot Weedylot is offline
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Default Re: 2 stroke Vs. 4 stroke

Con: The price is higher for a 4 stroke most likely to cover the extra moving parts and assembly.
Con: 4 strokes are also heavier, than the same horsepower output 2 stroke.
Pro: 2 strokes rev up to their peak power quicker.
Pro: A quality 2 stroke is usually preferred by performance seeking buyers.
Con:You can't as easily pull up to a gas pump and fuel up, compared to 4 stroke. You have to measure 2 stroke oil and add it to the tank, or carry a supply of premixed fuel.
Con or pro: Even a European quality 2 stroke goes "Rrriiinky-dink-dink-dink-dink" when you rev it up.
A 4 stroke goes "Bump-bump-bump-bump" on a steadier beat.
As a personal observation, I've seen 2 stroke MBers that ride a "kit" bike with grimed up shoes because the exhaust pipe in the kit dumps its oily smoke almost directly onto your foot or feet.
I ride a 2 stroke moped with a long exhaust pipe and a four stroke moped (Whizzer)
It's all a matter of taste.
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Old 04-15-2009, 01:14 PM
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Default Re: 2 stroke Vs. 4 stroke

agreed the 4cycles are more money...but, you get what you pay for
you never hear of any engine probs with them (gearboxes yes, engine no)
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Old 04-15-2009, 03:23 PM
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Default Re: 2 stroke Vs. 4 stroke

you dont always get what you pay for,some websites are charging more for the same quality engines and just want more profit.i hear many problems for both 2-stroke and 4-stroke engines,leaking engines,engines not starting,lack of power,etc..
what extra parts with a 4-stroke,it just sits over the rear wheel.they just charge more beacause you dont have to hook up a fuel tank and line and they charge more for there cheap mounting bracket.and they charge more because it takes just gas.
im not saying either one is bad or good,each one is for the right person.
and my 2-stroke dont go rink a dink dink,its starts on first try and sounds like a mini motorcycle but its more quiet,it actually goes putt putt putt in a steady beat.
and i would like a 4-stroke on the back of my bike so i could hide it by putting a milk crate over it,even thou it stands like 2 feet over the rear rack,lol.plus it wouldnt interfere with the peddals,but like i said a 2-stroke kit is $99-149 and a 4-stroke is over $249-300?
o and my exhaust does not dump on my foot it dumps it straight down to ground.

Last edited by Cabinfever1977; 04-17-2009 at 01:30 PM.
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Old 04-16-2009, 01:10 PM
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Default Re: 2 stroke Vs. 4 stroke

Howdy MFC. I have both Chinagirls and one inframe 4 stroke.
4stroke; much better ride and sound. No mixing fuel. More dependable and much higher quality (you can get a $500+ 2 stroke, just saying the basic kits for bicycles) Much easier for any distance ridding. Although faster (top speed 35.4 stock Honda/grubee kit) Not as "quick" as a china girl and takes longer to get up to speed. Once at top speed, still smooth and MUCH Less vibration and does not sound like it needs to shift or die. Better gas mileage and emissions. Not as sexy as the classic looking china girl. With the commercial gear boxes available at present, wide and a bit cumbersome. Much better longevity. 3+ times the price and very well worth it.

ChinaGurl; I love em, sexy lil wonders. But loud at top end with stock parts. Mixing oil is a pain away from home, on the road. More emissions. Designed for 1940's English steel bicycles and seldom fit easily on to a modern aluminum frame. They are cheap and getting cheaper. ($ wise) Intrinsic manual clutch Although the clutch on a Chinagurl can be challenging to a beginner to set up initially, it is all but bullet prof later. Price, just cant beat the price.

If one can easily afford it, I would suggest a 4 stroke kit for a first build. Far easier, dependable and less hair pulling. But is a preference thing to be sure. If you get a chance to ride one of each, I would. Lots of members in AZ and spookytooth is located at 1 Cochise Row
Bisbee, Arizona USA 85603
1.866.243.4552 Spooky Tooth Cycles - Motorized Bicycles: Gas Powered and Electric Bikes - Home
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Last edited by Dan; 04-16-2009 at 01:29 PM.
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Old 04-16-2009, 05:57 PM
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Default Re: 2 stroke Vs. 4 stroke

I agree. The 2 strokes are lean and cool. The 4 strokes are super duty, almost as lean, do not look as cool but still very cool. But the 4 strokes are much much smoother and make better power. The Titan 4 stroke which is a 48.8 cc 4 stroke will run circles around the F80 2 stroke kits. But the 2 stroke kits are much cheaper. They are both a blast !! I consider the 2 stroke Good times motors to be chevys. and the 4 strokes Titans to be caddies. Just depends on what you want and what you can afford. You can also get Caddie 2 strokes. Franco Morini Motori or KTM 2 strokes. These 2 strokes are of super quality and is reflected in the cost at around 500 bucks or more per pop just for the motor. These 2 strokes will run circles around any 4 stroke of comparable size. They make so much power it may tear your bike in half. Keep that in mind.. As for emissions, with these new 2 stroke bio and synthetic oils, the 2 strokes do burn super clean for sure. So do the 4 strokes. They are all clean burners these days and get well over 100 mpg to boot. Enjoy the ride...
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Old 04-16-2009, 07:37 PM
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Default Re: 2 stroke Vs. 4 stroke

Quote:
Originally Posted by Dan View Post

If one can easily afford it, I would suggest a 4 stroke kit for a first build. Far easier, dependable and less hair pulling. But is a preference thing to be sure. If you get a chance to ride one of each, I would. Lots of members in AZ and spookytooth is located at 1 Cochise Row
Bisbee, Arizona USA 85603
1.866.243.4552 Spooky Tooth Cycles - Motorized Bicycles: Gas Powered and Electric Bikes - Home
I was thinking, man how did he know that AZ is next to NM. Then I realized Dan is on the east coast and distance concepts between states are weird. Short trip, LOL Heck, it 200+ mile for me and I live in AZ Your gonna need a
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Old 04-16-2009, 09:38 PM
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Default Re: 2 stroke Vs. 4 stroke

LOL Flightaz. I read the wrong location. (looked at Bill's)
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