victorforge
Thread starter
If you read everything that Snowbum has to say about valve recession (which I know is a challenge) the really bad valve seats were BMW's first attempt at a solution in 1981. They made them from a material that a had a poor heat transfer coefficient which effectively made the problem worse not better. Yours are way prior to that date so will still be cast iron.
What Snowbum also points out is the larger capacity 1000 cc engines are worst affected which ties into fact that the problem is temperature related. I have the smallest airhead engine at 473cc and give or take a couple of barrel fins it has the same cooling surface area as the 1000 cc models with the result that it runs relatively cool. No real surprise then that I don't appear to suffer any valve recession at all. At 600cc you have the next smallest engine which should bode well.
On an unrelated topic do you have any problem with pinging ?
The R60/6 had milder cams which means the valves close a little earlier on the compression stroke. Published compression ratios are based on swept volume but in reality dynamic compression doesn't start until the inlet valve is closed. The end result is that engines with the milder cams have a higher dynamic compression ratio at low revs. This has made the R60 slash models a little more prone to pinging. If you should have this problem the usual solution has been to fit a a cylinder base plate to lower the compression.
Snowbaum’s articles are very informative but a LOT to read. I was actually trying to buy an ‘78 R100s. That’s the one that will likely need it then.