Hi there just a quick update on my 320 exhaust rocker ,fitted new rocker and found the shimes to be wrong size .i had 3 pairs in total from previous adjustments ,so found nearest over size and ground the top face down on a square sharpening stone only 0.0 something of a mm ,this was easier than I thought and saved me waiting 3 weeks for new ones . Not sure if I mentioned I also fitted new decompression mechanism as this has not worked for the last year or 2 . End result is a bike that is almost a pleasure to start ,easy to kick over and start. Before fixing decompression I was leaning on a tree with all my weight over the bike to be able to kick it over so this is a huge improvement. Just one negative , im not sure weather I can hear a ticking on idle. I wonder if this is something to do with decompression mechanism and it will have a short life like the last one . If anyone has any experience or imformation on this it would be appreciated regards ralphy