Tubes are perfectly fine for smaller machines, but questionable on the higher HP 350x and 250R. I have run tubes for years in 200x's, and not had one problem yet. I ran a tube in my 350x, and it spun the tire and ripped the tube, but this was in a crash when I let my brother ride it... Now I have holeshots on the 350, and they both have tubes, as the tires were once ice racing tires, and were near new tread. I took out the studs, and haven't had a problem with the tubes yet, and have rode it pretty hard at times. I would be willing to bet a tube would be fine in a Big Red, and I would try it at 15 dollars. As stated above, get the steel threaded valve stem tubes for sure.
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes