** LAMS / Learners Bike Discussion **

[Type R Positive]

Well thats a good reply but Ill rephrase it...

2 strokes are less reliable...

Because of this they do have efficiency problems... the reason they are used is because they are lighter (power:weight)... and cheaper to make... but you wont find a car with a 2 stroke engine because its not as reliable or efficient...

There is also the fact that the engine is burning oil at a higher rate than a 4 stroke so its going to need a topup of oil more frequently than the 4 will... so its less efficient

A 2 stroke wont last as long, so its less efficient...
More expensive maintaining it as well... costs more to run

Less reliable? I'd stop now if I were you.
From your talk I can tell you have never owned a 2 stroke.

CR500 2 stroke = most reliable bike ever built.

2 strokes make more power per capacity than 4 strokes.
Power efficiency goes to the 2 stroke.

Parts are way cheaper. I had to rebuild the top end on my 4 banger, cost over $2,500 for parts from USA. Costs 1/5 of that for a cylinder and piston on my 2 stroke. Bikes are cheaper to buy for starters too. Cost efficiency also goes to the 2 stroke.

Maintenance is also a win for the 2 stroke. I could change a piston out in 10 minutes on my 2 banger. Same job takes 1/2 a day on my 4 stroke. Cams FTL.

Down side is mixing fuel, and using more fuel. Both problems are solved on EFI 2 strokes. Pity only available on outboards at the moment. Replacing rings is also more frequent on small 2 strokes, but my 500 2 stroke needs them replaced like every 2 years, just like my 4 stroke.

As for no 2 strokes in cars? There has been quite a few. Even trucks run 2 stroke diesels.