Question about Polaris ATV
Can anyone help me, I have a 2005 Polaris 700 sportsman 4x4 that once it warms up, looses power? It starts right up cold, no problem with more power than needed really... BUT once it warms up, it drastically looses power??
My 2005 700 efi is doing the same thing. So far I have found that the engine and exhaust get so hot that the fuel starts to boil and causes the fuel pump to vapor lock. I taped up the tank with some reflective tape/insulator stuff and now I'm trying to figure out why its running so hot.(The exhaust manifold glows red hot) I've cleaned the radiator and flushed the system. I just need to check the water pump and thermostat. Any other suggestions?
Posted on Sep 02, 2009
My Sportsman runs bad when heated up, but if you add fuel it runs fine again. I had a pick up that had an internal fuel pump like our Sportsman's and it did the exact same thing. It turned out being the fuel pump was worn out due to a plugged fuel filter. Forcing the pump to fail prematurely. I found I had bad fuel in my Sportsman and am going to replace the filter and the fuel pump. I also checked my plugs, MAF sensor, and Air filter, they were fine.
Posted on Sep 16, 2009
Sounds like your EFI system is running too lean. Check your spark plugs for any signs of running too hot. Check you injectors. Download any Polaris manuals for your ATV and look up EFI system dianostics and trouble codes conversions.
Posted on Sep 11, 2009
I HAD THE SAME PROBLEM PRETTY WELL ITS PROBABLY THE STATOR BRUSHES NEED TO BE CLEANED OR THE NEXT TIME IT HAPPENS CARRY AN EXTRA PLUG AND CHECK THE SPARK
Posted on Jun 25, 2009
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