I agree with Scram X...

Also Plugs can fouls in one ride on 2 strokes , it needs to be checked regularly, especailly if its running bad.

Jim


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Polaris, Injector Pump Care, 2-cycles only

For owners of the 2 cycle oil-injected engines, there are a few tips you should know about. Listed is for the 400 engine, but most should apply to the 250 & 300 as well.

About once a year or so, the oil injector adjustment should be checked. This is pretty simple & explained in the owner's manual, but here is a refresher: Remove the injector pump cover (easy to find, just follow the oil line from the tank) and look carefully inside. There should be an index mark on the linkage arm the cable connects to, and another cast into the pump housing itself. Have a friend (or you can use a rubber band in a pinch) apply pressure to the throttle lever to the point where the throttle is just about to start opening, but doesn't. The marks should be in line. If not, adjust the cable so they are.

Now for the rest of the story. The cables sometimes get rusty, or the lube dries out of them. Since thumb pressure opens it up to pump more oil, but a small spring returns the lever to it's idle position, they almost always stick 'open' if they stick. Symptoms include 'burning oil' odor, excess smoke, and fouled spark plugs. If the cable just appears 'dry', remove the seat & left side panel. Find where the 2 cables connect into one. You can open this up with gentle persuasion. Apply lube to the cable that goes down to the injector, and make sure it works freely. If it is rusted, about all you can do is replace the cable.

Sometimes, moisture gets in the box. It is a good idea to spray WD-40 in there after doing your annual calibration check. This will disperse any moisture, and help seal it out better for next time. Not only does moisture cause rust, it can freeze things up in cold weather. If, after riding through snow, slush, or water the throttle seems 'stuck' in below-freezing temps, the first place to look is the injector pump box.



Polaris, My 2 cycle fouls plugs

A fairly common complaint with the 2 cycle Polaris machines is that sometimes, they foul plugs what seems like way too often. While it should be known that a 2 cycle will foul plugs far more often than a 4 cycle will (due to 2 times as many firing sequences, and the fact that it burns oil with the gas) the plugs should go a while.

On my personal Xplorer, I have over 3000 miles on the plug currently in it, and it is still going. First off, the jetting needs to be set properly. If you have an un-modified machine, chances are the company/dealer has it set up properly. However, if you changed exhaust pipes, you probably need to rejet. Sometimes the pipe manufacturer claims no rejetting is needed, but it is still a good idea to check.

The best way is to ride around a while, and check the spark plug. It should be dry, and have a tannish brown color to it. If it is black, or appears blistered, refer to Snowride's excellent article on how to re-jet. However, black fouling can also be due to over-injection of oil, especially if the oil has a 'scabby tar' look to it. If this is the case, you need to check out the injector pump calibration, and also check for a frozen, or rusted pump cable.

 

What other kinds of modifications are done to it? Is it stock? Does the smoke go away after it is warmed up or does it do it all the time? You could try some sythetic oil like amsoil...they are pretty much smokless when warmed up. It could be a pilot problem as well.

 

one things also to check is the counter balancer oil level. because if the mag side crank seal goes out it can suck all the oil out of the balancer area and if ran to long that way it can damage the balancer gears and bearings.there is a dipstick down below your carb just screw it out to check the oil level. if its low use 10/30 motor oil in it.run it a little bit and recheck it if it goes down fairlly quickly and smokes really bad than the crank seal is bad and letting the oil in the balancer area suck in to the crankcase area.

 

if you have a plug fouling problems,you can get fitch fuel catalyst,drop some in the gas tanks and plug fouling will
disapear.i've removed them this summer to see if that worked out, from my gas tanks,and after those rides,plug fouling was more frequent,1 each ride at best,now i just put back 3-4 of them fitch fuel unit in the tank,and the result is clear,no more plug fouling and it also greatly help to reduce engine vibration as well.