ORIGINAL: Old Fart
Read your post and was wondering if the engine has had a big nose first dive into the ground recently,with the prop off and spinning it does the crank look like it has any runout?
The thunder tigre 75 is a good reliable engine,as you know,the eighty two is lighter and much more powerful if you are flying it in something like a decathlon.It's a buzz
I eyeballed the prop movement as I rotated the crank. I couldn't see any visible travel/runout. I don't have any precise instrumentation to measure for very small runout. I will check it with a measuring stick when I run it on the test stand. I guess that is still be than using the old *****ometer.