marter71 (December 31, 1969 at 6:59 pm)

the oil is 32:1 i apolligize for 2x posting!

marter71 (December 31, 1969 at 6:59 pm)

yes very true and mine is a STIHL weedwacker-I use 1/2 87 octane gasoline and 1/2 E85 (i make the E85,84% Denatured Alcohol,16% Xylene),fuel stabilizer,1 cup amsoil hp injector 2-cycle oil and 1 tablespoon turpentine, i did calculating it is a 95 octane Fuel, works ok

yorrickhunt06 (December 31, 1969 at 6:59 pm)

He's oversimplified and confused the natives...That illustration is pretty shit and doesn't include the exhaust expansion chamber which makes the engine more powerful and efficient. You dont get TWICE the power obviously, each combustion is a little less powerful than would be the case in a 4 stroke, but it happens twice as often, so you always get more power (and torque. power is the product of torque and speed) from the same sized 2 stroke.

3th4n69 (December 31, 1969 at 6:59 pm)

you can bore out a 125 to a 135.you can even bore out a crf100 to a 135

BUNCHofxs (December 31, 1969 at 6:59 pm)

2 strokes make more horsepower but dont make very much torque intill they reach very high rpm 4 strokes CAN make alot of horsepower but torque is made in the lower rpm ranges.

urveen (December 31, 1969 at 6:59 pm)

4 strokes are more efficient and for that reason, generally produce more torque because more work can be extracted from the burning air fuel mixture on the power stroke. The reason the mixture is in the crank case in a 2 stroke, is for pre-compression purposes. This helps increase the pressure of the mixture so it flows/gets pumped into the cylinder, and helps offset the lower compression ratio on the compression stroke.

Quarker99 (December 31, 1969 at 6:59 pm)

Yep, that's true, it creates air pressure...

Quarker99 (December 31, 1969 at 6:59 pm)

great explanation, i was also wondering as soon as the new mixture is let in the exhaust port is left exposed, so its inefficient...

urbanannihilators (December 31, 1969 at 6:59 pm)

you mean torgue?

TuPP3 (December 31, 1969 at 6:59 pm)

Twice the power? What comes to 2 strokes and 4 strokes on wheels, doesn't 4 stroke has more torsion(I'm not sure is that right word, mean like driving up hill), and 2 stoke has more speed.Is lower part of piston full of gas :O? Why it doesn't just go straight to upper part cylinder instead of filling lower part?