Are these bad cams ATVs been using Synthetic 0w-40?

I know on my Honda Foreman and Yamaha 350s I world just use any oil or weight car dinosaur lying around in the garage, but one these Fuji dry sumps they want synthetic and the correct weight.

 

I couldn't tell you what mine had before, I just bought it a couple of weeks ago. I changed the oil and used the polaris oil change kit. From the looks of the old oil that came out it looked pretty bad. I have only rode it far enough to load it on my trailer and start it up in my garage. Reving it sounds like a hot mess when you let off of the throttle.

 

Old Polaris tech.

How do I get to the cam?

 

Have to remove the cam cover Second thing is to down load this free pdf manual to help you out..Will show you quicker on what to do than I can type. Index of /ORV Manuals/Polaris/1996-1998 - All Models

 

Ok so I got to the cam, yes it is pretty rough in there, do you have a link to a cam replacement?

1997 polaris scrambler 500

 

Be sure to order the exhaust rocker arm as well as the cam. The rocker arm pad usually is scored up also. Here's about the cheapest Oem parts online I've foind,But I've seen cheaper after market cams on Ebay. Don't know how they'd hold up. You can either go with this updated cam for your 97 model(3086212) OR install a later model HO cam(3085855) as some have done. Only difference is the duration,the lobe height is the same on both cams.Dirt Cheap Yamaha, Honda, Arctic Cat & Polaris OEM Parts & Accessories – Cycle Parts Warehousehttp://www.cyclepartswarehouse.com/f...2000&fveh=5498 Just my on this.If you don't go to the larger HO carb,the HO cam wont make that much difference on the 97 model. I'd stay with the recommended 3086212 cam.

 

The cam lobes were within spec. They were far out out adjustment. At TDC I couldn't get the feeler gauge in between the adjuster and the valve. I adjusted them. Haven't started it yet, will let you know. Thanks OPT

 

Sounds like you may have gotten lucky! If you cant' fit a .006 gauge under the adjuster,then it's too tight. Let us know if this solves your problem.

 

I think that is why the cams were blue, from the heat generated from them being too tight. I started it. Feels like it has more power on rev. Still pops a little on deceleration of the throttle, but as loud as it is I think someone took the baffle material out of the muffler. Have a replacement on order.

 

Also got new throttle cable, what a difference!