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Post by travist on Jun 29, 2012 12:45:29 GMT -5
Hello, I moved from sea level to the mountains of CO. Because of the terrain, and the air density, I get about 25mph up mild hills, and maybe 35 on the flats. I'm at 8000'.
What jets are recommended for this altitude?
I don't know anything about springs, weights, and so on but I'm interested.
What would be a good set of parts that would allow me to climb hills? I will rarely have flat ground to go all out. Top speed around 60 is nice (I've never had that, even at sea level), but I won't have many chances to run it out that long. I need torque more than high RPM HP.
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Post by tortoise on Jun 29, 2012 13:10:03 GMT -5
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Post by Bizzibody on Jun 29, 2012 13:43:40 GMT -5
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Post by orphansoul on Jun 29, 2012 13:47:07 GMT -5
Well, when you move up that high you often have to rejet your carb because of the air density, thats going to be your first problem.
Then, if you are still not happy with performance on the hills, your next option would be to lighten your roller weights a little, but if you're already at 8000, it might be pushing it to lighten any further.
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Post by chromestarhustler on Jun 30, 2012 1:02:33 GMT -5
i am a tad lower than you, i am at 6000 feet, with a drilled out stock muffler and free flow filter, and 10 gram weights to spin the piss out of the engine so it has some heft going up long inclines my average is about 112, few scooters took 110, some 112, one or two 114. less Oxygen up here, means less fuel, and you lose a few miles per hour, as our engines can not match the speed of the full breathing flat lander brothers.
at sea level 20.9 percent oxygen, at your altitude its 16 percent oxygen, so its a cut of almost 25 percent, I can still hit mid 50's on my 150's, i just gotta run it harder.
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Post by gitsum on Jun 30, 2012 10:20:00 GMT -5
at sea level 20.9 percent oxygen, at your altitude its 16 percent oxygen, so its a cut of almost 25 percent, I can still hit mid 50's on my 150's, i just gotta run it harder. You almost got all of your numbers correct  8000 ft means a 24% reduction in air density and a corresponding 24% less oxygen. However, oxygen is always 20.95% regardless of how dense or thin the atmosphere becomes. If your scooter is tuned for sea level, then re-jetting the carb will be required. I would suggest opening up the stock airbox a bit first to help compensate for the thinner air. Adjusting the fuel/air screw will tune the pilot jet, you will probably need to drop the main jet a size or two. The vacuum slide should be able to handle 8000 ft with no changes required for the needle jet. If you plan on riding at lower elevations also, they make a "air valve" you can install on your stock airbox to open or close as needed. Then you can run stock at lower elevations and still get more air at higher elevations too. |
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Post by tortoise on Jun 30, 2012 12:25:58 GMT -5
oxygen is always 20.95% regardless of how dense or thin the atmosphere becomes. Sidebar . . if you visit the top of Pikes Peak (14,115 feet above sea level) with a liquid-filled compass, the containment may expand just enough that a bubble will be present due to the lower atmospheric pressure, helmet and boots may feel just slightly "snugger", and perhaps tire "feel" just slightly altered. Apparently scooters and mopeds under 50cc are restricted on the Pikes Peak toll road. |
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Post by chromestarhustler on Jun 30, 2012 13:35:05 GMT -5
at sea level 20.9 percent oxygen, at your altitude its 16 percent oxygen, so its a cut of almost 25 percent, I can still hit mid 50's on my 150's, i just gotta run it harder. You almost got all of your numbers correct 8000 ft means a 24% reduction in air density and a corresponding 24% less oxygen. However, oxygen is always 20.95% regardless of how dense or thin the atmosphere becomes. If your scooter is tuned for sea level, then re-jetting the carb will be required. I would suggest opening up the stock airbox a bit first to help compensate for the thinner air. Adjusting the fuel/air screw will tune the pilot jet, you will probably need to drop the main jet a size or two. The vacuum slide should be able to handle 8000 ft with no changes required for the needle jet. If you plan on riding at lower elevations also, they make a "air valve" you can install on your stock airbox to open or close as needed. Then you can run stock at lower elevations and still get more air at higher elevations too. i just took the numbers and made them percents based on standard conditions at sea level so its easier for some one who doesnt know what your talking about could understand, cause if i said the o2 percentage was the same they might be confused, its an odd concept that requires fluid pressure understanding, maybe i shouldnt have said it was less oxygen, but its less oxygen based on standard conditions of one meter cubed at sea level then adjusted to altitude. hopefully they get the idea. they been robbed of 25 percent of the oxygen that they are used to. so they have lost O2 percent based on one cubic meter at altitude pressure, but the air is easier to cut thru so the losses arent quit as bad. on a related note the higher you live once you get used to it say you then went and visited kansas at 2000ft abovesea level for a wedding, its harder to get drunk.  lol good luck in colorado, took me a few weeks to get used to the air, was weak most of the time, and the air felt so thin. |
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lol