1999 sportsman 500 idles great, wont accelerate
#1
1999 sportsman 500 idles great, wont accelerate
I bought this 1999 sportsman 500 to fix up and sell. It had been sitting for at least a year or two do to a stator problem. Got that all fixed and cleaned everything up( new spark plug, new air filter, change fluids, ect.). She fired right up and idles great but when you hit the gas it boggs down to the point of dying. Its also just about blows the airbox cover off when you hit the gas. Ive found a similar post on here but no one was able to come to a conclusion. The entire airbox assembly is correct and tight with no leaks or cracks. It reads about 130 psi at the cylinder head, and seems to be getting sufficiant gas. I pulled the carb off and re adjusted the fuel needle to factory (2 5/8 out) and cleaned it. Ive worked on my share of polaris atv's but this ones got me. Any ideas are greatly appreciated.
Thanks, Jason
Thanks, Jason
#2
#4
1999 sportsman 500 idles great, wont accelerate
So.... Pulled the cam today and it aint good fellas! The center lobe assumingly the exhaust lobe is not only worn but its literally almost a perfect circle. The intake lobes are good and meet usable specs. What a Joke! How is this possible on an atv with only 2500 miles on it. I cant justify a new one on this thing so guess I'm lookin for a used one that will work.
#5
1999 sportsman 500 idles great, wont accelerate
<div class="FTQUOTE"><begin quote>Originally posted by: hesborn2fly
So.... Pulled the cam today and it aint good fellas! The center lobe assumingly the exhaust lobe is not only worn but its literally almost a perfect circle. The intake lobes are good and meet usable specs. What a Joke! How is this possible on an atv with only 2500 miles on it. I cant justify a new one on this thing so guess I'm lookin for a used one that will work.</end quote></div>
Happens all the time! I'd say 95% of the ones I've found ground down are from infrequent oil changes,WRONG oil and filter! When you replace cam be sure to clean screen on tank as probably will be full of shavings! Good luck
So.... Pulled the cam today and it aint good fellas! The center lobe assumingly the exhaust lobe is not only worn but its literally almost a perfect circle. The intake lobes are good and meet usable specs. What a Joke! How is this possible on an atv with only 2500 miles on it. I cant justify a new one on this thing so guess I'm lookin for a used one that will work.</end quote></div>
Happens all the time! I'd say 95% of the ones I've found ground down are from infrequent oil changes,WRONG oil and filter! When you replace cam be sure to clean screen on tank as probably will be full of shavings! Good luck
#6
1999 sportsman 500 idles great, wont accelerate
By the way I put a new flywheel on and cant remember what the the old ones timing marks looked like. Is the "T" mark for TDC or is it the three lines just beside the "T" mark that indicates TDC on the flywheel? The book just states " line up the mark in the timing window" it doesnt say which one it is.
Thanks
Thanks
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