2005 Polaris Predator 50/90 Sportsman 90 Service Manual

Something I've noticed with the AWD on/off operation. When AWD switch is in the on position and the AWD light is on (trans engaged), turning the AWD switch off kills the engine. With trans in neutral, AWD light is off, turning switch off does not kill engine. Since I don't have the operators manual yet, I'm wondering if this is normal operation?
Thanks, Ray

View File 2014 Polaris Sportsman 570 EFI EPS Owners Manual
2014 Polaris Sportsman 570 EFI and Sportsman 570 EPS Owner's Manual for Maintenance and Safety
Submitter Georgeann Stricklin Submitted 06/10/2019 Category Polaris ATV  

2014 Polaris Sportsman 570 EFI and Sportsman 570 EPS Owner's Manual for Maintenance and Safety

Problem: The ATV starts and runs at idle perfectly. But as soon as I open the throttle, the engine starts to slow down until it stops. On the attached video you can hear the sound of how it works: see video below
Prehistory: there is a Polaris Sportsman 500 1998, which for about 1.5 years stood in repair, including also replacing CDI with one taken from the same ATV. Finally, the vehicles were on wheels, traveled several kilometers and overheated - forgot to fill the antifreeze Came back home in small moves. The next trip started well, but after 10 km there was a feeling of a small drop in power (even as the vehicle got warm completely) but still drives. Next trip - the situation is repeated. The next test of ATV through time and a huge loss of power from the very beginning. The engine sneezes, does not want to go more than 5 mph.

What has been done: the carburetor has been replaced with a new one (inexpensive, $ 40), a new spark plug, a new ignition coil, the engine head has been removed, the piston is in good condition, valves were corrected - but the problem was definitely not in them.

Ignition control unit is suspected. Who faced similar? Please help in solving the problem.
Thanks in advance.
 
 

I have a 1999 Sportsman  500, it was running fine, than started to lose power in the winter, I adjusted the idle screw and away I went, than a few weeks ago it died, I have found that i am flooding the engine, compression was at 70PSI and due to the compression release mech. i assume i am good as it compared to the same PSI on a 2000 sportsman 500 i have. i cannot start the atv unless i go full throttle and it starts an runs for about 30 sec than dies, again it is flooded. i ordered a new carb off ebay as i could get one for around $40. put that in same issue, i have checked the timing, (good), valves out of adjustment i adjusted to .006 still same issue, i have found the exhaust lobe and rocker arm to have some wear, i have ordered new ones, but am looking for any other input in this area as well. would the exhaust cam and rocker arm cause the engine to flood? i have used a bore scope and the piston liner has good cross hatching still? any input would be great.