I have a friend in puyallup( the one with the georgous , unmolested 71) it sat in his basement for 20 years. I got it running for him, and he lost the key. he took the ign switch to a real lock smith, and had two smooth working keys for 8 bucks in 5 minutes.
I was curious if it was a master's key, so we tried it in his other 80' 650, and my 80' and it only worked in his 71.
but it has to be a real locksmith. not ace, or homedepot.