Did you ride the 500 CanAm, with 2 250 motors grafted together? Now that would be awesome, but to me, only on dirt track. My old neighbor 4 houses from me was GrandNationalChamp#5 in 1958, or was it '55. MartyMalchow. He'd have some top dirt trackers over his house when I was in 4th grade, and I was interested, but didn't know a thing about bikes.
My bud Kevin one eye, who works at WiseSurfboards still, still has his Maico490, but my Kawasaki always got better starts, due to less power, but smoother power and better hookup.
Even KennyRodriquez's RM-500 had worst starts than my 420, as he rode it one expert race and started 2 of 3 motos dead even with DaveCoupe on the factory Yamaha490. Too much power is not good for me, and Kenny was 190 lbs.
I got to work for HarryHunt, one of the TeamYamaha private teams out of Brisbane, Calif, with DonGreene the main rider. My part was DunlopTires, never rode the TeamYamaha bikes, but got to scrub in tires at several EastCoast road tracks for ArtBauman and RonGrant of TeamSuzuki. Those 500 2 stroke twins would hit 10,400 rpm in 6th gear, supposedly 175 mph. I laid up the fairings and seats for them.