When say coward? what does it do? Have you done a plug check? Whats the plug look like? wet and black its fouled and it running to rich. If you check your spark when it dies and you have none you have a electrical issue. If you have no spark your coil or stator my be at fault. My guess is you have a electrical issue and when they get hot they loose amps to power the trike. When they cool down they work. I think both bike run the same coil to check if it the coil. Good luck
"If you are going to piss like puppy, Don't Get Off The Porch"
Trikes:
84' Suzuki ALT185 (old Orange)
85' Yamaha 225DX, piped and spaced ( First Girlfriend)
Quads
87' Yamaha Banshee, built and very very fast (The Whore)
01 Yamaha Raptor 660, built and piped (The Beast)
03 Suzuki Vinson, 26's and piped (The Crowd Pleaser)
Once apon a time:
85' Tecate 300 alky flattacker, 6 in over swingarm, 88 Suzuki 500"Quadzilla"PIA , 91 Yamaha Warrior Built and Modded. (luved that Baby Tank)