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Thread: 03 sportsman 600 power problem

  1. #1
    Join Date
    Apr 2014
    Posts
    3

    03 sportsman 600 power problem

    hello. I have an issue with my 03 sportsman 600 that my mechanic cannot figure out. i'll do my best to explain. i hop on my quad when engine is cold. start it up and i run it down that road say about 40-50 mph. everything is fine until i hit somewhere around 1 mile. then all of a sudden i have no power. the engine acts like it has a fuel restriction. it putters and putters. it does not die, it just does not let me rev very high. maybe 15mph is the top speed at this point. if i push the throttle more it just putters. this only happens at high speed down the road. i never have a problem putting around my property. i can run it all day just pulling a trailer at low speeds and have never had a problem. if i park the quad and let the engine completely cool down and try it later in the day, again everything is fine till about 1 mile down the road.

    this is very annoying. so far the only thing I've done is change the fuel filter. my mechanic has no suggestions for me. others have pointed to vapor lock. then others say, "no way, do you know how hot the fuel would have to be for it to be vapor lock?"

    so I'm look for suggestions. has anyone had this problem and successfully fixed it?

    thanks
    adam

  2. #2
    Join Date
    Aug 2006
    Location
    La Crosse WI
    Posts
    39
    Sounds like your pickup coil is going bad. I'm sure it is an electrical issue by the "cool down and its fine" statement.

  3. #3
    Join Date
    Apr 2014
    Posts
    3
    Quote Originally Posted by Matt150 View Post
    Sounds like your pickup coil is going bad. I'm sure it is an electrical issue by the "cool down and its fine" statement.
    thanks, I'll investigate that.
    adam

  4. #4
    Join Date
    Apr 2014
    Posts
    3
    the problem still persists. when I run down the road and it starts acting up, I can pull the choke and it clears right up. then of course when I slow down and stop, the engine dies. so I have to remember to push the choke in before I stop.

    adam

  5. #5
    Join Date
    Dec 2006
    Location
    Central NY
    Posts
    970
    your gas tank may be vapor locking (and it dosnt take excessive heat to vapor lock) your vent may be plugged...when this happens remove the gas cap and see if the problem clears up...if it does remove front plastics and see were the little vent line from the top of the tank is blocked of or just replace it

  6. #6
    Join Date
    Aug 2004
    Location
    wisconsin
    Posts
    636
    Quote Originally Posted by spyshot View Post
    hello. I have an issue with my 03 sportsman 600 that my mechanic cannot figure out. i'll do my best to explain. i hop on my quad when engine is cold. start it up and i run it down that road say about 40-50 mph. everything is fine until i hit somewhere around 1 mile. then all of a sudden i have no power. the engine acts like it has a fuel restriction. it putters and putters. it does not die, it just does not let me rev very high. maybe 15mph is the top speed at this point. if i push the throttle more it just putters. this only happens at high speed down the road. i never have a problem putting around my property. i can run it all day just pulling a trailer at low speeds and have never had a problem. if i park the quad and let the engine completely cool down and try it later in the day, again everything is fine till about 1 mile down the road.

    this is very annoying. so far the only thing I've done is change the fuel filter. my mechanic has no suggestions for me. others have pointed to vapor lock. then others say, "no way, do you know how hot the fuel would have to be for it to be vapor lock?"

    so I'm look for suggestions. has anyone had this problem and successfully fixed it?

    thanks
    adam
    intake boot between carb and enginge is cracked. it will be sealed up when cold and stiff but as it warms the crack opens causing a lean condition which is aided by pulling the choke. you may have to remove intake boot to see cracks.

  7. #7
    Join Date
    Jun 2016
    Posts
    25
    I had that problem with my 500, turned out to be bad fuel pump.

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