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Post by ramblinman on May 26, 2013 5:47:19 GMT -5
after a 10 mile ride yesterday my top speed improved from about 33 mph to 45 mph. i assume this happens because the piston swells giving it higher compression. is that a correct assumption?
how long can an air cooled 50cc 4t engine run hot without causing damage? should i let it cool off or enjoy the increased speed? it's nice to go faster but my main goal is reliability.
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Post by larry001964 on May 26, 2013 6:43:57 GMT -5
Hi Ramblinman
I think it's more because your CVT gets warmed up, belt, clutch, Variator... After they are warm they make better use of the power... Fawkes acts the same way...
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Post by prodigit on May 26, 2013 12:59:20 GMT -5
Also, when the engine is hotter in the cylinder, the cool air get a higher combusting temperature (while with a cold engine, a lot of the combustion energy gets sucked into the cylinder walls, causing less energy to be converted to motion).
Yes, also the belt gets warmer, meaning it brings less resistance, but it's minor power you'll barely notice.
Piston swelling is not really what happens. If it did, then the engine block would swell too.
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Post by larry001964 on May 26, 2013 13:26:05 GMT -5
It's a little more than minor, and one can't help but notice it... As I said Fawkes acts the same way.....
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Post by geh3333 on May 26, 2013 22:54:54 GMT -5
Sounds as if something else is happening, a 12 mph gain is a big increase. Do you let the auto choke finish before you ride?
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Post by onewheeldrive on May 26, 2013 23:12:36 GMT -5
Sounds as if something else is happening, a 12 mph gain is a big increase. Do you let the auto choke finish before you ride? I'm with you here. That is a huge difference and I've took off many times without warming my scoot up with pretty much the same top speed. Yeah it does run a tad faster, even more so in the winter, after warmed up. This would be all over the forums---- if many scooterists were having that prob. |
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Post by geh3333 on May 26, 2013 23:44:44 GMT -5
My scoot also runs a bit faster in cold weather. I was wondering if maybe he is already runing rich and if he is riding as the auto choke is engaged there might be a bad air to fuel ratio until the autochoke disengages. Of course i would expect there to be bogging at some point but not sure ive never heard this one before.
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Post by ramblinman on May 27, 2013 4:33:32 GMT -5
My scoot also runs a bit faster in cold weather. I was wondering if maybe he is runing rich and if he is riding as the auto choke is engaged there might be a bad air to fuel ratio until the autochoke disengages. Of course i would expect there to be bogging at some point but not sure ive never heard this one before. just rode home from work after a dbl. was expecting about 33 mph but it hit near 45 mph all the way home.(speedometer read 50 so near 45 is my estimate, usually it only hits about 35 on the chinese speedo) it is most-likely running rich. it has decent take off speed then bogs down around 20 mph. if i gradually give it throttle it doesn't bog as much. this scoot needs some work. all the hoses are in bad shape and i can smell gas but no noticeable leaks. i want to replace all hoses, fuel filter, air filter and possibly fuel valve. |
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Post by larry001964 on May 27, 2013 7:14:01 GMT -5
I suppose the cooler temps in the morning, and running a little rich would explain it pretty well.. Now that I think of it, it is in the mornings that I experience the same from Fawkes.. Definitely more power, however Ive also experienced better performance from the CVT after I have driven a few miles. So maybe it's just a combination of all coming to gather
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Post by spandi on May 27, 2013 7:41:30 GMT -5
Back in the 1980's (and 55mph on the interstate.) I rode my Honda 125 Elite for 140 mile round trips to DC without a thought, after about a half an hour or so the digital speedo would begin to climb, (like a express elevator) and on one occasion hitting an unbelievable 73 mph! (This would only happen when the engine got hot, and you'd find yourself flying down the road.)
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Post by ramblinman on May 27, 2013 8:18:42 GMT -5
one occasion hitting an unbelievable 73 mph! (This would only happen when the engine got hot and you'd find yourself flying down the road.) lol... flying down the road is how i felt this morning. before owning this scoot 30 mph is the fastest i have ever experienced on 2 wheels. 73 is insane.  |
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Post by devo344a on May 27, 2013 8:20:33 GMT -5
Cooler air is denser and will make any engine run better
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Post by geh3333 on May 27, 2013 12:06:41 GMT -5
That's correct its just funny the better performance is quite pronounced in colder weather.
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Post by scooter12 on May 27, 2013 13:45:15 GMT -5
Yesterday, I rode into Jefferson City to Binder Lake.. It rode fine, but as the temperature outside( 81 degrees) well the engine on my 250 scooter, gets hotter. Humidity has something to do with it also. More humidity, the hotter it gets. But I took a 15 miles ride, got traveling 70 mph( full throttle) because was on a 70 mph Expressway. It was fun. Didn't quite hit the redline, but was close. It ran like a champ though. Runs better in cool weather.. I can ride it in cool weather for 200 miles without giving it a break. Than a little later, I saw 3 motorcycles on the side of the highway- giving bikes a break. Now it could be I need different sizes of needles in carb or just needing to adjust it. Anytime one has to open full throttle, the engine will get hotter. Going 55 mph, it stays cool still. Attachments:
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Post by spandi on May 27, 2013 14:10:51 GMT -5
Yesterday, I rode into Jefferson City to Binder Lake.. It rode fine, but as the temperature outside( 81 degrees) well the engine on my 250 scooter, gets hotter. Humidity has something to do with it also. More humidity, the hotter it gets. But I took a 15 miles ride, got traveling 70 mph( full throttle) because was on a 70 mph Expressway. It was fun. Didn't quite hit the redline, but was close. It ran like a champ though. Runs better in cool weather.. I can ride it in cool weather for 200 miles without giving it a break. Than a little later, I saw 3 motorcycles on the side of the highway- giving bikes a break. Now it could be I need different sizes of needles in carb or just needing to adjust it. Anytime one has to open full throttle, the engine will get hotter. Going 55 mph, it stays cool still. Here in the SoCal desert cooling can be an issue. I solved it on my 250 by putting in a much larger Spal fan and designing and fabricating brackets for it. It was a bear to figure out, but once done, no worries. (I still can't understand why they bother with a fan more suitable (imho) to a blowdryer than a large scoot.) |
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