My Stihl KM-90r quit running right, and the fix turned out to be pretty interesting.
Topdon thermal imager: https://www.amazon.com/promocode/A1Q4T1A9H9BDHA
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The Topdon thermal imager is also quite interesting and useful.
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00:00 Intro & what’s wrong
2:56 Troubleshooting fuel, spark
4:40 Carb removal
6:47 Check valves & exhaust
9:20 Cam gear & timing
12:56 Topdon thermal imager
15:50 Continue teardown
18:41 Inspect cam gear & how it lubricates
21:00 Clean valves and why it failed
24:18 Fix clutch
27:15 Meanwhile…
27:51 Reassembly
30:48 New cam gear
34:28 Compression release
37:01 Adjust valves
38:45 Complete assembly & testing
40:29 Adjust carb
43:05 Opinion on Stihl
44:47 Outro