While you have the other hand available to grab anything? Do motorcycles have space available under the seat as scooters have?
If you have a throttle drag screw, you can ride no-hands if you want. BMWs had them for years. Harleys also had throttles that did not return on their own.
If you have a Jawa Californian with a sidecar, you can go from neutral into first, then ease the bike off the line and shift up through the gears, all with no hands. Just crank down the friction steering damper, set the throttle with the revs at about 2500-3000 rpm, toe the bike into first (the shift lever also disengages the clutch), then ease off on the lever, and away you go. It’s a hilarious stunt at rallies.
A friend with a withered left arm set up his MZ so he could clutch and brake with his right hand. Hs left was in a brace, so he just rested it on the grip, essentially riding one-handed. I tried to convince him a Jawa was the way to go, but he stuck with the MZ, a better bike in any event.
Custom scooters and creative 2 wheeled small motorcycles at the Bangkok, Thailand 2010 motorcycle show and motor bike extravaganza! World Muisc and world jazz by Michael Pluznick and joel Lindheimer from the CD, Miles Dean available on CD Baby!