Question: Whats better 4 stroke or 2 stroke?

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  1. Tizzy, engines are not my specialty, but I found this list of pros and cons when I looked…

    Advantages of 2 Stroke Engines:
    – Two-stroke engines do not have valves, simplifying their construction.
    – Two-stroke engines fire once every revolution (four-stroke engines fire once every other revolution). This gives two-stroke engines a significant power boost.
    – Two-stroke engines are lighter, and cost less to manufacture.
    – Two-stroke engines have the potential for about twice the power in the same size because there are twice as many power strokes per revolution.

    Disadvantages of 2 Stroke Engines:
    – Two-stroke engines don’t live as long as four-stroke engines. The lack of a dedicated lubrication system means that the parts of a two-stroke engine wear-out faster. Two-stroke engines require a mix of oil in with the gas to lubricate the crankshaft, connecting rod and cylinder walls.
    – Two-stroke oil can be expensive. Mixing ratio is about 4 ounces per gallon of gas: burning about a gallon of oil every 1,000 miles.
    – Two-stroke engines do not use fuel efficiently, yielding fewer miles per gallon.
    – Two-stroke engines produce more pollution.
    — The combustion of the oil in the gas. The oil makes all two-stroke engines smoky to some extent, and a badly worn two-stroke engine can emit more oily smoke.
    — Each time a new mix of air/fuel is loaded into the combustion chamber, part of it leaks out through the exhaust port.

    What do you think? Are engines your specialty?


  2. My cat says four strokes are always better than two.

    I won’t pretend to have a clue about engines. I’m utterly useless. As my son says “Mom is good at biology. But don’t ask her about car stuff.” You can expand that to include all engines.


  3. Whichever means less work (petrol use etc) for more vroom, I’d go with that one…

    Simply put, I no nothing about engines either! lol


  4. I ride a bike and haven’t ever owned an engine but I do remember my grandfathers two stroke chainsaw. It was loud. Very loud + smelly. Four stroke engines are more fuel efficient and environmentally friendly when compared to two stroke engines. I’d go 4 stroke.



  1. Well I own a 2 stroke race bike, and while 4 strokes are more efficient and better for the environment, 2 strokes have a better power to weight ratio, which gives them quite alot of power over four stokes, especially in the smaller bike range, although too much power can be bad because it will wear a racer out and can throw them off the back if the throttle is twisted too much. You will see that most motocross bike producers have actually turned to 2 strokes in the smaller bike ranges simply because they can juice more power from the smaller 2 stroke engines, I also like 2 strokes because there loud and are actually very easy to maintain compared to your modern day 4 stroke race bike. Thanks for giving your opinions guys.


    • Tizzy, looks like you know more than all of us combined! You’ve definitely taught me something! Hope you’ve enjoyed I’m A Scientist!!