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Did you ever figure out the issue? My 2010 sportsman 550 is having the same issue and I have replaces key switch, and solenoid, but still wont crank with key, jumping the starter works fine..
I'm sure the issue was resolved two years ago.

Instead of hitchhiking on an old thread, why not just start a new one and get guidance on resolving your issue - while the symptoms may seem the same most problems have their own resolution - what fixes one doe not necessarily fix another one.

When you start a thread, be sure to include vital info like VIN, year, model number, related modifications and recent work performed whether by yourself or a qualified mechanic.
 

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Did you ever figure out the issue? My 2010 sportsman 550 is having the same issue and I have replaces key switch, and solenoid, but still wont crank with key, jumping the starter works fine..
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I'm sure the issue was resolved two years ago.

Instead of hitchhiking on an old thread, why not just start a new one and get guidance on resolving your issue - while the symptoms may seem the same most problems have their own resolution - what fixes one doe not necessarily fix another one.

When you start a thread, be sure to include vital info like VIN, year, model number, related modifications and recent work performed whether by yourself or a qualified mechanic.
How about quit being an ass and try helping.
 

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How to trouble shoot a no start issue

Okay so your quad does not start here is a logical step by step diagnosis to help determine what your problem may be. This guide is not meant to fix your issue just to help you determine what it is so you don’t throw away useless time and money. It is intended to help the person who has not had a lot of experience in fixing these issues. The seasoned mechanic knows these and the short cuts you can take while doing this stuff.
Something to consider: Occam’s razor says that the simplest solution is most likely the right one. If you hear hoof prints you should think Horses and not Zebra’s. :)

NO CRANKING:

You put the key on and it does not start:

1) Make sure the run switch is on

2) Make sure the quad is in Neutral

3) Make sure the battery is in good shape and fully charged

4) When you turn the key do you get a clicking from the solenoid

a. If you don’t hear a clicking then you have to make sure that you have power to the solenoid from the key switch. You can meter it from the thin wire on the solenoid. If you don’t then you have an issue in the switch.
b. If yes, then meter the contacts of the solenoid while turning over the key. You should have 12 volts on both sides. If you do not then clean both the terminals, reattach the wires and recheck. If you still don’t then replace the solenoid. Just because it clicks does not mean that it is working.
c. If you do, then you need to check voltage at the starter motor. Meter the wire lug on the starter and check to see if you have continuity from it to the solenoid lug that is not powered. If you do have continuity, then put a jumper cable directly to the battery positive terminal and touch it to the starter motor lug.

5) If it does not turn over then you need to pull the starter motor out and rebuild it. It will be one of three things: The brushes are broken or work out (most likely), the starter is rusty and filled with sludge and crap or that the magnets have become unwelded from the side of the starter case. The first two can be easily fixed with an inexpensive rebuild kit and a cleaning. The third makes the starter motor useless except for parts.

6) If it does turn over then your next step is make sure you have spark. Remove the plug and put it back in the spark plug boot and ground the tip on the motor and turn over and make sure you have a solid spark. If you don’t then you have an ignition problem. If you do have a spark then pour some gas down the spark plug hole and put back in the plug and see if it fires. If it does then you have a fuel issue.

7) If it wont start with the starter until the motor is warm then you likely have water in the starter that is either freezing and then thawing when motor warms up or until some of it is evaporating letting the brushes make contact with the armature or loosening up the bearings so that it spins easier. Either way it need to come apart.

Hopefully this will help some people figure out what direction to work toward.
Perhaps checking to make sure you have gas should be an important step as well... I have seen this too many times. People just have no clue sometimes.
 

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started up a 04 sportsman 400 4x4 that has been sitting for 2-3 years. i drained & changed all the fluids including gas. put on new fuel filter. it has spark, it wont start unless i spray some starting fluid into the air intake boot. even with it some what running, its sluggish & back firing, i removed the fuel line & cranked it over, to me it doesnt seem like very much fuel is being pumped from the fuel pump. im thinking about just replacing the pump & tearing down & cleaning/rebuilding the carb. any ideas?
Sounds like you have the issue pretty well licked. The fuelpump is not that hard(if it's a manual gravity type feed) not very much on Amazon, if it's in the tank model it's a hassle but can be done in a few hours. But B4 all that I would try some carb cleaner into the boot. If it still acts the same, and you can get to it, let the gas drain out of the carb(s) into a clear glass or heavy duty plastic container. If it's really grungy, pull the carb and clean it out good. Maybe all that is needed. Hope this helps and you have a good successful endeavor.
 

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I have a 2014 Sportsman 850 ho. the starter clicks but wont turn over. Unless I run a wire from the positive on the battery too the spade connector on the starter. It will also start if i jump the terminals 87 and 30 at the relay box. I switch the starter relay with all the relays and its all the same click.
 
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