The trap in the crankshaft is hard to remove but is a must do whenever the bottom end is apart. I learnt this lesson as a youngster when I rebuilt my 500 Trophy in a corrugated iron lean to at the back of the commune (yeah alright, bloody hippies, but this was in the very …
If your 650 engine no is between DU44394 and DU887147 then you can reduce running temperature and therefore extend engine life at no cost, next time you have the crankcases apart. From DU44394 an oil pump with better scavenge capability was introduced and after DU887147 the crankcase oil level was increased by shortening the length …
Follow the manual to remove the valve covers etc and measure valve clearances. This is where my brain starts to hurt as my feeler guauges are imperial, and I think in Thou, and I have trouble keeping track of what shim I need and where it goes. Try this spreadsheet Valve Shim enter clearance in thou, existing …