Originally Posted by FLYWULF

I have just replaced the injection pump on my 603 because the old one was leaking. I used the opportunity to check the timing marks and found them a bit out. I reset all the marks and when I ran the motor it runs MUCH better than before. It also solved the excessive smoking problem I had. The issue I am having is this, the engine seems to misfire intermittently when cold and also seems to have knocking noises that were not there before at idle when the engine is cold. Any suggestions how to alleviate the rough running at idle when cold?