2000 Scrambler 500 4x4
#12
#13
#15
Measure the intake and exhaust lobe with a micrometer or caliper,borrow one if you can or rent one from any auto store.You can do this by having the lobes at an angle to allow measurement. The std lobe height on all 3 lobes is 1.2884 to 1.2924. The minimum allowed is 1.2766. If the exhaust lobe is at this reading or less,then replace the cam before it does go out and destroys the exhaust rocker arm with it.If the measurements are within tolerance,just adjust the valves. Valve stems can wear over time,but it's usually not a problem. Most "normal" reasons for valves to tighten,especially intake valves is that they are softer and "mushroom" out at the valve face in the seat over time and doing so close the gap between the adjuster and valve stem. The exhaust lobe itself was the problem on many cams.
#16
so to me, it looks like the exhaust lobe is pretty bad, is that correct? I am ready to replace it if you think it needs it. This is my first Polaris, I am a newb with these. I fully restored my Banshee, which is way easier to get parts and my wife's 97 Fourtrax is indestructible
Last edited by cwilson1972; 08-02-2013 at 08:27 AM. Reason: add pic
#17
Just measure the clearance on the lobe to the std lobe height. If worn,then yes replace it. Hard to tell from the pics. Here's where I ordered cams before and got it in about 3 days and fairly cheap compared to a dealer. Plus there are now aftermarket cams showing up on Ebay,but I haven't heard good a or bad on them.The 2000 Scrambler has the stronger updated HO cam already,but anythings possible,if wrong oil used,not taken care of etc. Dirt Cheap Yamaha, Honda, Arctic Cat & Polaris OEM Parts & Accessories – Cycle Parts Warehouse Does look like the lobes have gotten hot (blue color)
#19
1997 Polaris Scrambler 500
My bike starts up just fine, idles perfect. When I give it throttle it spits and then bogs down and dies. It will go into gear just fine, but it will not move.
Your help would be much appreciated. Cleaned the carb thoroughly through and through no build up or anything. I still ordered a rebuild kit though. What is the issue with this thing? I'm not that mechanically inclined, I just know a little. HELP PLEASE!!!
Your help would be much appreciated. Cleaned the carb thoroughly through and through no build up or anything. I still ordered a rebuild kit though. What is the issue with this thing? I'm not that mechanically inclined, I just know a little. HELP PLEASE!!!
#20
My bike starts up just fine, idles perfect. When I give it throttle it spits and then bogs down and dies. It will go into gear just fine, but it will not move.
Your help would be much appreciated. Cleaned the carb thoroughly through and through no build up or anything. I still ordered a rebuild kit though. What is the issue with this thing? I'm not that mechanically inclined, I just know a little. HELP PLEASE!!!
Your help would be much appreciated. Cleaned the carb thoroughly through and through no build up or anything. I still ordered a rebuild kit though. What is the issue with this thing? I'm not that mechanically inclined, I just know a little. HELP PLEASE!!!