I'm working on a 1972 R-75/5 & as it warms up to operating temp the left side exhaust valve area gets noisy. The lash is fine & the rocker arm bushing & side play are good as well. I'm thinking of pulling the head to see if the exhaust seat is loose. Any ideas ?.
I also need to buy the exhaust pipe tool to remove the fin nut from the head & Beemerboneyard is out of stock. Who else sells the wrench ?.
Thanks for the link Nick :thumb: the wrench is on the way. The pushrod tube has a small dent in it & the pushrod has a slight shiny spot where it rubs the dent. Other than that everything else checks out ok.
The valve guides & seats are in good shape & the piston pin clearance between the piston & rod bushing was .0006. I'll fix the dent & hope the noise goes away.
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