information on the performance and running costs between a 4 stroke engine and a 2 stroke , any advice and exsperince on buying unknown brand mopeds from china and such.
2007-06-19 10:24:14 · 6 answers · asked by Way Dommy 1 in Cars & Transportation ➔ Motorcycles
most of the stuff coming out of china is cheap...but you get what you pay for...they do work.. & if you dont expect a performance rocket.. they are OK
learn about engines & what they do here
http://www.carbibles.com/fuel_engine_bible.html
the car & bike bibles have lots of info on motors, brakes ,suspension and the like..
2007-06-19 12:45:33 · answer #1 · answered by Anonymous · 0⤊ 1⤋
The 4 stroke goes 1. suck 2. squeeze 3. bang 4. blow. (intake of air fuel / compression of air fuel / ignition of compressed air fuel / exhaust of burnt air fuel) All this is done between the cylinder head and the top of the piston, (so there is only one chamber where all this happens). Valves in the cylinder head let the fuel mix in, close for compression stroke and firing stroke the open for the exhaust stroke. The 2 stroke combines all of the above into 2 strokes, by using the piston to replace the function of the valves in head of the 4 stroke plus the area under the piston (i.e. the crankcase). So there are two chambers where this happens. There are a number of tubes and holes (called ports) in the cylinder wall all at differnt heights. 1. between the carburettor and the crankcase, 2. between the crankcase and the upper part of the cylinder 3. between the cyclinder and the exhaust pipe. To keep it simple we start from when the engine is first kicked over. When the piston goes up, it opens the port between the carburettor and the crankcase so that fuel/ air is sucked into the crankcase. When the piston goes down it closes the port from the carburettor and forces the mixture through the next port past the top of the piston into the combustion chamber. As the piston continues it closes this port and begins to compress the mixture. ( At the same time the next lot of mixture is being sucked into the crankcase.) This the suck and squeeze both happening at the same time. That is one stroke. When the piston gets to the top of the cylinder the spark plug ignites the fuel which pushes the piston back down the cylinder, as the piston goes down it opens the last port to the exhaust pipe. The shape of the exhaust pipe helps to suck the burnt mixture out, and it is pushed along by the next lot of mixture coming up from the crankcase. This is the bang and blow combined into the 2nd stroke. The whole process is continuous and a little more technical but it should give you the basics.
2016-05-19 23:36:54 · answer #2 · answered by ? 3 · 0⤊ 0⤋
A 2 stroke engine is meant to be more efficient as it has a power stroke every second stroke. In practise they are more smelly as they rely on this shot of oil.
China has a large and growing internal market. Ten years ago the advice would have been don't. Today it is take the risk or let your friends try it out first. The Chinese industry is often partnered by western brands. For example you can, or could, get BSA bicycles in China, built by the Chinese for the Chinese market.
2007-06-19 10:41:22 · answer #3 · answered by d00ney 5 · 1⤊ 0⤋
Spend the extra money and buy a quality brand name scooter.
You won't be able to buy parts or get someone to work on an unknown brand, like something from China and through mail order, except at an authorized dealer.
Have you seen any in your area?
And it takes months to get parts.
The only warehouses are in China.
To save on shipping costs, they ship parts on a monthly basis.
If they make a mistake with your order, or you ordered the wrong part...sorry, come back in a month.
Parts and service manuals are not offered to the public, just authorized dealers.
So dealers that don't sell them, don't want anything to do with them.
Because of their inferior quality, it'll need major repairs in about a year.
2007-06-19 12:49:37 · answer #4 · answered by guardrailjim 7 · 2⤊ 0⤋
guardrailjim is absolutely right on all counts. Two-strokes can be smelly but there are scented synthetic two-stroke oils you can buy.
2007-06-19 15:42:56 · answer #5 · answered by infernoflower 3 · 0⤊ 0⤋
For better answers . . edit your question to include:
approximate budget
speed expectations
some reference of where on the globe you reside
New To Scooters
http://scootdawg.proboards59.com/index.cgi?board=general&action=display&thread=1181608486
2007-06-19 10:47:18 · answer #6 · answered by Anonymous · 0⤊ 0⤋