 Hey, if you're looking to repair your Polaris ATV Check out my channel, and please subscribe. I've got plenty of Polaris repairs More subscribers I get the more videos I make and the more you get to learn. I got two strokes four strokes Whatever you get I got a video on it Right now I'm working on the scrambler Hit the like button if you like the video and I hope you enjoy the show All right today, we're gonna replace the head gasket on a two-stroke 400 Polaris This applies to scramblers Explorers ending with the 400 engine in it yeah, I had the piston or the cylinder loading up with coolant and It wasn't running right so I pulled the spark plug See the spark plugs all wet and I think I have a Coolant running out of one of the studs up here. So what I'm gonna do is I'm gonna pull the head off and I'm gonna put a new gasket in and hopefully that'll cure my problem. So Disconnect your hoses drain your coolant Make sure you disconnect this Should be about two four six twelve millimeter nuts I'll come on see stud came out of that one. That's the coolant in there. You can see it inside. It's all soaked What happens is sometimes your engine overheats and your head warps and Then once your head warps that doesn't seal correctly. Here's your gasket There is a certain direction it goes on so pay attention when you pull it out But yeah, I think it's pretty mashed. So I got a new gasket. So I'm gonna throw that in I and Tighten everything down. We're gonna torque it down and hopefully that cures my problem I'm gonna try to show you what I mean here What I do is I'll take a straight edge with the head put it up to the light and I'll see if I can see any lights in between there and It doesn't show up in the camera too well But I hold it up to the light right there. You can see it. This is warped a little spots there a little spots there I happen to have another head and what I do is I'll sand it down. I'll start with Say about 220 grit and I'll sand it more with 320 till it gets finer and finer go down to 400 to 600 And smooth make this completely flat It's actually an old school trick And another way I tested now I put the old hat on and it actually rocked back and forth This nice sand one is tight And so when I go to put the new gasket on it's not gonna be warped There won't be any high spots or low spots and Yeah, that should cure my problem. All right, so I cleaned up all my surfaces So the way you install this is if you can see here, there's a Two little holes one's got a little Curve mark in it Goes that way you don't want to install it that way And there's a tab up here And then this goes towards the exhaust Put that on like that Now also keep in mind if You've got an issue where you had a coolant leak There is a drain plug at the bottom of the engine you're gonna pull that plug out and Make sure you drain all the coolant out of the bottom of the engine and I can go ahead and Put my hat on and that was the one the The nuts stuck on the stud so I'm just gonna put that back in that way And then you torque these in a crisscross pattern My memory serves right. I think it's one two three four five six Or it's the other way, so I think it's this way torque them to spec leave it 18 to 20 all right, so we're those Drain plugs are under the engine. It's kind of a better to get to It's a shine the light up there not the first one on the left the second one one way on the right Should be right up here Right here, so you spin that out. It's kind of a barrier to get to because On the scrambler frames in the way Explorer and I'll let that pan comes off so it should be easily get to it so pull that plug out and drain any coolant and You should be good to go after that And once you got everything back together Don't forget to open your bleeder screw your air bleeder screw and top off your coolant So while you're pouring your coolant and listen for air to rush out And then a little coolant will trickle out of it the air rushing out Starting to trickle out Take that up. You have a success successfully bled the air out of your coolant system You don't do that it'll still overheat So there you have it one head gasket installed Just keep in mind the the studs For the head they tend to stretch so there's a chance you might replace the gasket and Still have the same issue So you might want to replace the studs So I hope you enjoyed this video. I enjoyed making it just as much as I enjoy working on these four-wheelers Subscribe to my channel. I've got plenty of players repairs on there And like always till next time