One pharked 71 FLH motor
Gretings from Australia,
Riding at 70 MPH my 71 FLH stopped running and coasted to a halt. No compression on either cylinders. Pulled it down and found unbelieveable damage. Hole in rear piston (new KB Pistons), All valves bent (4) Cracked valve guides. I just rebuilt it using quality American parts.
The cam timing seems to be OK, but the valves have hit the pistons hard!!!The only thing I can think of is that the moulton alloy from the holed piston jammed the oil pump relief valve and pumped up the lifters which lifted the valves?? I and others don't understand what went wrong.
I had just fitted new points and possibly it was too far advanced. The carby is an S&S Shorty and souldn't be running lean. Bores weren't damaged.
Any ideas? As you can imagine, I don't want it to happen again.
Andrew, Geelong, Victoria, Austraila.