Originally Posted by old polaris tech
First question is the air box lid on with the K&N filter?If not this could be a big part on jetting. Not a fan of Dynojet kits because they mark their own jet sizes and they don't correspond to Mikuni or Keihin sizes.My two cents is put it back stock with the standard main and pilot jet and needle and go from there.Another problem on the Predator is people forgetting to check valve clearances. Shim under bucket system that can cause problems if the valves are too tight.
There is no lid on the k&n as it just connects straight to the carb it's not pannel filter the standard air box has been taken out completely. I wouldn't think it is the valve clearances or shims as it was running spot on before it went in for a carb rebuild . I just don't understand how it could go in for a rebuild , the 170 main and dyno needle put back in and it still not running right . Is there anything that could of gone wrong during the rebuild incorrectly adjusted float etc ?