Here's a post from the Jockey Journal in a thread about Kenny Roberts. It gets into the ban of 3&4 cylinder bikes for flat track open class leaving it to the HD XR750.
I can have it both ways, enjoy my shovelhead and even though I don't own one at present (I'd get a naked bike likely a Duc) I can enjoy sportbikes too. Here's the post:

I lucked out and ended up at Indy that Saturday night. You could actually see a puff from the back wheel of Roberts' bike on the last turn. Because we were higher in the stands we couldn't clearly see the finish line, we could see the rest of the track though. We thought Roberts got second - which was incredible in itself.

The shame of the "legend" is that it leaves out the fact that there were four other TZs and three or four H2 Kawasakis, a few from Irv Kanemoto, with all of them pitting together in a general area. Only Aksland and Roberts did ok on the TZs and Don Castro ran second (I think) in the Trophy Dash (consolation for non-qualifiers), passing two Harleys on the straights and being repassed on the turns. Castro never quite figured out the line as Roberts did.

The other shame is that the story ignores the story of WHY and HOW for the Champion TZ. This story is told in the January 1976 Cycle World article (have it right here at hand) about and test ride of the Champion TZ750 mile bike. D. Randy Riggs rode Steve Baker's bike and wrote the article. Riggs and Baker (the first World GP champion from the U.S. in the 750 class) felt the ban was premature and not well thought out, that the bike had incredible power, but power to be respected and controlled. It wasn't the uncontrollable bike that the later legend made it out to be... otherwise Roberts probably wouldn't have ridden it again at Indy in 09.

The key points from Schwerma's opinion, were the good dependability and safety record of the TZ in roadracing and that many privateer AMA Grand National circuit riders had them. He saw the potential for a rider to have a reasonably competitive mile bike for the cost of adding a rolling chassis to their stable rather than a whole bike. After all the AMA GN points payout included roadracing, mile, half mile, short track, and TT racing and a privateer needed to get as many points and make a living.

Yamaha ignored the late Doug Schwerma's rerquest for a bike to use, even the offer to buy the bike and do all the work. He obviously eventually got one and built SIX chassis. They went to Roberts, Skip Aksland, Randy Cleek, Steve Baker, and Rick Hocking. He built the bike to use as much of the roadrace gear as possible, with the consideration of the privateer AMA grand national rider at the center of thought. The stock pipes, radiators, temp gage, and electrics came off the roadracer and on to the rolling mile chassis. The bike had been tested on half miles by Hocking, but the engines had never really had any sort of tuning mods for ridability, which could have boded well. Kind of a shame.

That ban took out EVERY multi-cylinder engine with 3 or more cylinders. It took out the H2 Kawasaki, the Suzuki GT750 (Ronnie Rall ran one), the Triumph/BSA triple, and any future 3/4 cylinders from ALL competition. Even now there is a bit of its effects on racing. You poor flat track enthusiasts out there don't ever get to hear the wonderous sound of the Tridents or any of the two strokes even on the Vintage circuit. The AHRMA didn't allow any 3/4 cylinder engines either. The closest I've heard was Rick Hocking on the TD2 at Ashland several years back - incredible. The sounds of Indy that night signaled the end of an era of development of new sources of power, ushering in the XR750 domination for the next 35 plus years. (Of course there was the RS750, but the AMA screwed it up adequately to quash it too. Heaven forbid the breed be improved.) The excitement was greatly diminished for me.

I guess you can tell I really liked what I saw that night and not so much the single brand racing that resulted from the ruling. Because Roberts was such a competitor, he ran the bike to the limits to win at almost all costs. Also because of that and his comments another dozen or so riders were denied the ability to have a reasonable ride in their pursuit of the AMA GN title after the ban. The fact that no one was injured or killed in the testing and racing of the TZ750s or the H2s kind of speaks volumes about the validity of the claims of those opponents along with the skills and talents of the racers who rode them. You'd have thought these bikes were going to be put in the hands of some squid stunter the way it sounded.

--------------------------------------------------------------------------------
Last edited by klx678 : Today at 07:14 AM.