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Post by gsx600racer on Sept 4, 2018 20:43:31 GMT -5
I agree, if your not talking about fuel economy/burn efficiency, a 2 stroke is more efficient making power on every 360° rotation of crankshaft vs a 4 stroke that makes power ever 720° rotation of crankshaft.
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Sept 4, 2018 22:54:49 GMT -5
I don’t know if you ever rode dirt bikes, but another difference 4 stroke/ 2 stroke in the dirt is traction. Many years ago I rode a 500 cc single dirt bike. There was a long hill with a very steep part about 2/3 the way up. Everyone called it Rattle snake mountain. Of course is was nothing like a mountain. Only about 700 feet or so, but for our area a big hill. The guys on their two strokes had a terrible time getting to the top. Of course the problem was they had to back off the gas when they got to the steep spot to “suck into” the hill. Then they to get back on the gas to make it the rest of the way. Way more often then not, they would spin out when they got back into it.
My wife wanted to get to the top, but didn’t want to try to ride up ( she had a Penton 125). So I told her to jump on the back of my BSA and rode up the hill double! It was all about traction, and the big 4 stroke had a lot more of it!
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Post by GrumpyUnk on Sept 5, 2018 11:19:25 GMT -5
Thumper?
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ratdog
Scoot Enthusiast
Posts: 342
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Post by ratdog on Sept 5, 2018 12:06:43 GMT -5
We used to call the big four stroke singles like my 500 BSA and later my 600 Yamaha, thumpers. When they were working hard it was like “ Thump... Thump...Thump”
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