I have a similar issue with my -88 to this post: https://www.theminif...ving-from-stop/
When I let go of the clutch and press the throttle there's a clunk.
I have looked through the engine bay. MY suspicion is the top steady. I can move it slightly by hand (I don't think it is supposed to?) and the bolt closest to the rear bulkhead is loose (I cannot tighten it). Is my suspicion correct?
Also, I can rock the engine by hand. I do not believe this is normal. It can't be. Can it?
