I have a few bikes and rotate them.
Back in March I put my '73 500F away because the infamous pucks/head gasket leaked so bad at 80mph it would blow oil on the side cover. Since then Ive been alternating my other 4 bikes.
A few weeks ago I went in the garage and started up my 500F to keep things flowing. Phone rang and I got tied up on a call for about 10-15 min. I had adjusted the choke at startup, and by the time I got back to the bike, it had been running stationary, at 4-5k rpms for like 7 min. IT. WAS. HOT. AS. HELL!!!
I hadnt touched the bike since then, 3 months ago.
Today I took it out and....NO MORE LEAK.
Here is me on it today:
https://www.instagram.com/p/B2IU_Uopy_F/https://www.instagram.com/p/B2IU2cXJOQI/