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Hi,

I'm new here and I appreciate any help on this. I have a friend that asked me for some help with her ATV. She has done a ton of favors for me in the past, so I figured I would see if I can help her out.

This is a Polaris Sportsman 500 and I'm pretty sure it's a 1998 model. I'm going to check the VIN and make sure, but I'm 99% sure.

Here is what she told me. They rode the ATV one day and than in the morning there was a leak on the floor. It looks like the leak is coming from the base of the cylinder, which doesn't look good to me. They also told me that they drained the oil and it was milk color, which probably means water has entered the motor. I asked them if they rode in a ton of water and they told me no, that wasn't the case. I have to assume some where the water pump has got some water into the motor. I have no knowledge of ATV's, but I do have a ton of motorcycle knowledge. I build motorcycles as a hobby, so I'm totally geared up for doing what needs to be done. That being said, I don't want to have to pull the motor.

1) Do you think it's just a head and base gasket that needs to be replaced? It's my understanding this is a strong runner. I will do compression testing before I rip it apart. It needs to be power washed as well.
2) How much am I getting into? I don't want to have to spend 12 plus hours ripping a motor down to do this. I have a WR250 in process that I need to build, 2005 Repsol CBR1000rr, and a full custom 74 Honda CB450, so I'm good with projects right now. I did tell her I would do some research and see what I come up with.
3) I have been searching and it doesn't look too bad to work on these. I have to imagine this can't be that big of a job, but I would like some feedback from some seasoned veterans on this. I have no background of ATV's, but a motor is a motor.

Here are some pics, that might help you guys. The guy spray painted the orange to show me where the leak was (Strange if you ask me). It's drained of radiator fluid and oil right now. I have all the tools I probably need to do the job, unless it requires special tools, which I can get them to buy. Before I dive in and buy a Hanes manual, I figured I would see if I can get some background from people that work on these.

Thanks,
Jonathan

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Hi,

Nice to meet all of you on the forum. I have some technical questions I'm going to post in the repair section of the forum. I appreciate any help I can get!

Thanks,
Jonathan

or it's gone... if no rides maybe some spam around here ?
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Hey everyone. My 570 sometimes will stop turning over when it builds up compression and I have to "jog" the key 5 or 6 times to make it finish cranking over. Original battery(2015), topped off with distilled water but still does it occasionally. I'm thinking of upgrading the battery to something with more CCA. here's a video from YouTube of what is happening. Let me know what you guys think

Hey everyone. My 570 sometimes will stop turning over when it builds up compression and I have to "jog" the key 5 or 6 times to make it finish cranking over. Original battery(2015), topped off with distilled water but still does it occasionally. im thinking of upgrading the battery to something with more CCA. heres a video from youtube of what is happening. Let me know what you guys think.

Recently picked up this 95 xplorer 400 up off Craigslist for $300. It was not running, and had been sitting in a barn for years with a broken pull start. I immediately ordered a pull start rebuild kit off eBay which was very poor quality and broke pretty much right away, but it did get the 4 wheeler to start. So I just bought a new battery and use the electric start, and this engine could not run any more perfect.

Only issue(s) it has: from what I can tell neutral and high beam idiot lights don't work, so I'm assuming all of them don't work which is a little odd.... also when I push the 4x4 button I don't get the red illumination by the button that I should, I hope this doesn't effect 4x4 from engaging? Also for some reason it's missing the front chain, does anyone know where I can buy just the front chain? If I order it from polaris it's not cheap, and I can only find the entire set of 3 chains elsewhere online. Any help is appreciated with these issues, and of course here is some pictures:

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