The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: trolle on July 19, 2010, 09:26:57 AM
-
As I was a little dissatisfied with the fuel economy of my new carbs even after finetuning, I checked my valve settings and found that all four valves had receded 0.1 mm since the last adjustment 5K miles ago.
They are now adjusted to the proper settings: 0.2 mm on the exhaust side and 0.1 mm on the intake, and the engine runs much smoother.
Question: Is 0.1 mm an acceptable change over 5K miles?
greetings from a semi sunny north
(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Flh3.ggpht.com%2F_IG1zYdpfI5U%2FTERZM2-rAOI%2FAAAAAAAAPLo%2FCwvQmOS462o%2F19072010.jpg&hash=acd0028bea2f517251e964ff6367fb51d627a9bf)
-
IT may be acceptable, especially if the heads have been pulled/replaced recently or the cylnders taken off and you hadn't checked the clearances in that 5K mile period. I would keep an eye on it though, and check it again after another 2K miles and see if they have stayed put or are continuing to lose clearance.