[Jessetw200]

I bought this bike in March of this year and I live about 4500 ft. I ride this bike almost every day back and forth to work and never had any problems with it. but I went riding a couple of months ago in the mountain by my house and it jumps up to 9000 ft. When I was riding then, when I started get up there in 8000 ft roughly the bike start to run a little bad, so I finished my ride and got back down to 4500 ft and the bike start running good again. So I knew that I would have to change jets next time I went up there again. Well I never got around to change the jets and went back up there last week and the same thing started to happen again around 8000 ft like I knew it would but when I came back down in the valley the bike never started running better. So I thought maybe I fouled a plug. I went and replace the spark plug and it did not change a thing. So I check the air filter and it was really clean, So I thought maybe some crap might be in the carb. So I just got done cleaning it out, and found nothing in the jets/needles. so now I stumped. What the bike does is that it starts right up and idles fine but with you start climbing rmps the engine start to cut out like it is running out of fuel but If you just give it more throttle the bike reveds up really good, and when you are driving it around, and come to a stop the bike idles back down fine but when the light turns green and you start to take off the bike cuts out real bad for just a few seconds and speeds right up like there was nothing wrong with it. Has anyone had this same type of problem? And when I was in the carb I notice that I has a 126 jet in it, What would be my best size jet to run with and these different type of elevations .So if I could get some help on here I would really appreciate it. My thought now where maybe bad gas? Electric problem? Any info would really help me! Thanks alot for your time!

 

[Rainman]

Sounds like bad gas or a clogged petcock.

 

[mhomadness]

What year is your bike?



How many miles are on it?



m.

 

[bcscammell]

I bought this bike in March of this year and I live about 4500 ft. I ride this bike almost every day back and forth to work and never had any problems with it. but I went riding a couple of months ago in the mountain by my house and it jumps up to 9000 ft. When I was riding then, when I started get up there in 8000 ft roughly the bike start to run a little bad, so I finished my ride and got back down to 4500 ft and the bike start running good again. So I knew that I would have to change jets next time I went up there again. Well I never got around to change the jets and went back up there last week and the same thing started to happen again around 8000 ft like I knew it would but when I came back down in the valley the bike never started running better. So I thought maybe I fouled a plug. I went and replace the spark plug and it did not change a thing. So I check the air filter and it was really clean, So I thought maybe some crap might be in the carb. So I just got done cleaning it out, and found nothing in the jets/needles. so now I stumped. What the bike does is that it starts right up and idles fine but with you start climbing rmps the engine start to cut out like it is running out of fuel but If you just give it more throttle the bike reveds up really good, and when you are driving it around, and come to a stop the bike idles back down fine but when the light turns green and you start to take off the bike cuts out real bad for just a few seconds and speeds right up like there was nothing wrong with it. Has anyone had this same type of problem? And when I was in the carb I notice that I has a 126 jet in it, What would be my best size jet to run with and these different type of elevations .So if I could get some help on here I would really appreciate it. My thought now where maybe bad gas? Electric problem? Any info would really help me! Thanks alot for your time!

Your carb is obviously jetted correctly for 4500 to 8000 feet. When you get higher your carb is too rich for the altitude. If you ride at such varying altitudes you may want to consider something like an adjustable jet system. Just a thought.







http://www.thunderproducts.com/dial_a_jet.htm

 

[Jessetw200]

What year is your bike?



How many miles are on it?



m.

its a 2008 with just over 2000 miles on it

 

[mhomadness]

First off, I like Gun Ships Idea, it might be the best solution due to that altitude, & variations of altitude.



Your bike is awfully new to have such problems. At first I was thinking bad gas / fuel, like old fuel from a gas can that has been sitting around awhile. This can cause problems, as fuel will loose volatile properties, as well as condensation forming inside the can, inadvertently leading to pouring water into your bikes tank. I think we can rule this out, as you found no evidence of this when you cleaned your carb.



The reason I like the idea of a variable jet carb for your situation is that you would most likely have to change jet settings often, as you change altitude, as the air temperature changes, seasonal climate changes, this could lead to a large amount of time experimenting with settings, which could otherwise be handled with the turn of a dial. (Your time is valuable too.)



This also has to take your wallet into consideration as well. Carb issues are a common thing addressed on this forum.



My best advise is to read the pinned carb help in the tech forum, & then decide where to go from there. Also check to make sure that the connection between your carb & the cylinder has not developed a vacuum leak, as you have removed the carb, a loose connection / fit on either side of the carb can lead to strange running conditions, not unlike what you have described.



If you decide to pull your carb off again, make sure you follow all the recommendations in the pinned carb help, double check your float level, make sure the carb diaphragm is A OK, any doubt, replace it, easier to rule out simple stuff.



Also, It would be a good idea to check & adjust your valve clearance & cam chain adjustment. m.

 

[PalmStateCrawler]

You got a promble?

 

[qwerty]

Sounds like a problem with the pilot screw or circuit.