On my2005 500 ho sportsman I had to replace timing chain sprocket on crankshaft the only thing that i can find says to line crank and cam to center line with pin up on cam i did that but engine wont start just back fires .. Am i 180 degrees out or just a tooth or so on gear? crank is set with piston on tdc crank sprocket marks alinged with mark for centerline dose the cam have to be set other than with pin up . thanks

 

Lower cam sprocket has a mark on it that lines up on mark directly at bottom. This will be TDC. Cam index pin lines straight up CENTER of head. Install sprocket and chain,THEN install cam tensioner. Adjust valves before you turn engine over,Then slowly pull recoil so tensioner can adjust! NOTE: Tensioner bolt must be loosened then tensioner removed before cam chain and sprocket work done. After tensioner is removed,remove loosened center bolt and spring,push tensioner plunger all the way in and reinstall AFTER sprockets and chain back on. Sounds like your timing is way off! Hope this help. OPT P.S. manuals are not expensive and can really help to keep from causing a lot of damage !

 

thanks opt I just wasnt sure if i had missed something on cam placement , I have a service manual that was verry fage on it .Is there a repair manual avaible ?

 

The Polaris manual even has a picture on cam timing, easy to understand even without instructions! dont know about Clymer or Haynes?