I was helping a friend tune up his 22R, with a weber.
While setting the timing and adjusting the carb I gave the throttle a couple quick snaps, next thing I know...the bottom end is knocking, bad.
He said they simply don't rev to anything higher than 3000 rpm. I may have exceeded 3k, but not by much.
He also said these bottom ends are super weak and top speed driving up I70 out of Denver (pretty steep pull) is 20 MPH.
I call BS, unless corrected? I've been tuning cars and trucks for 25+ years and have free reved these engines repeatedly and never blew a bottom end. I've heard chain slap, but never a rod/main knock from a simple rev.
He said he replaced rod and main bearings 200-300 miles prior. Did he install them wrong?
If you don't true the crank will this happen?
My experience with 20r engines is you can't hardly hurt them and will take running 5k rpm all day.
True false?
SD

If what I did blows up engines, I should have destroyed a 1000 or more by now. (this is the first)