Efficient motor
I was thinking of buying a particular 125cc motorcycle although this motorcycle turned out to have bad fuel economy and I figure it is due to the push rod motor that was used.
I want to learn more about what features enable a motor to be more efficient so I can make an informed decision. Is there information available can make this possible? |
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What DasChicken said, and also... it sounds like you didn't buy that 125cc bike. If you are still hunting, there are used bikes with great fuel economy. I have not owned a motorcycle in many years (except a scooter I don't ride), but here is a list I found through a google search: https://www.totalmotorcycle.com/Moto...MPG-under500cc
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I'm surprised a 60's Yamaha trail 80 tops that list. My first bike was something like a 1968 Yamaha trail 80, it certainly seemed to outpower my buddy's Honda Trail 90, maybe because it was a 2 stroke? Maybe his wasn't running right because he had to jump off on a few steep hills. Maybe his was one of the really early ones without the low range, or even a 55. I also currently have a tired 1963 Honda Trail 55 that won't climb my yard, but I only have the high speed sprocket, and my butt is 3 times heavier than it was in 1978. None of these bikes seem like they would get anything near 100 mpg, but maybe.
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Pushrod? What the heck was it?
I've owned a few bikes over the years, and even the one that was older than I am didn't have a pushrod engine. Cam timing/overlap, gearing, fuel delivery system, # of engine strokes, and engine size each have a notable effect on efficiency. If you want MPGs, you need something that suits the use you'll be putting it to best, and for us to make suggestions we need to know what/how you'll be using it...otherwise if it's purely about MPGs, a decent bicycle with a 4-stroke weed-eater engine will get you 200mpgs; But I don't think that's what you're looking for. |
The Vetter Challenge motorcycles were in the 175-250 cc range with body shells and gearing changes, and cruised at 50 -60 mph. A motorized bicycle would cruise at 25-30 mph with a stock small engine.
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I want to isolate what makes the engine efficient. A 25cc motor will be super efficient compared to a 250cc motor however the 25cc motor cannot travel at 110km per hour. Even engine capacity is not a definitive indicator as an engine may be poorly designed or not designed for efficiency. I am specifically looking for 110km per hour top speed and lowest possible fuel consumption. If I can get a scooter that would allow for recumbent seating but scooter CVT motors are heavy. We don't have Honda Wave here in Australia. |
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Interesting that the Yamaha XV-250 made this list. For all the bogus stuff on this bike (the phony rear exhaust pipe, for one) it's still pretty light for a twin at around 325 lbs. It's also under square in it's bore and stroke. Best of all it's been imported in the U. S. since 1988 meaning parts will always be available.
I'd venture to bet I could get it down to under 300 lbs. easily. On the modern end of things folks I know with Yamaha WR-250R's are easily getting 80 MPG. Imagine what you could do if you streamlined one of these puppies. |
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Seems like Honda will always keep at least one variation of the Cub engine for each market, even though it may not always follow the same approach as the original Cub.
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Anyone here purchased or ridden a Honda Super Cub C-125 yet?
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