1977 Yamaha TZ750 D OW31
So you think you want to go vintage racing? Now that it is 2012, the definition of Vintage has become so broad, and inclusive, you can choose from bikes that are not much more then bicycles with engines, to rocket ships which gave professionals a hard time. I think this 1977 TZ750 D would fall within the rocket ship category of vintage racing.
From the seller
1977 YAMAHA TZ750 D MODEL OW31. THIS BIKE HAS HAD ONLY ONE OWNER SINCE 4/1978. IT USES A STOCK FRAME AND SWING ARM. IT DOES HAVE SOME PERIOD CORRECT MODIFICATIONS WHICH INCLUDE TOOMEY PIPES.36MM ELECTRON POWER JET CARBS,BOYSEN REED VALVES,LOCKHEED GRAND PRIX FRONT CALIPERS WITH DRILLED/SLOTTED ROTORS. ADDITIONALLY IT CURRENTLY HAS A 16 INCH DIAMETER FRONT RIM FOR FASTER TURN IN ON THE HIGH BANKS OF DAYTONA AND OTHER TRACKS
With any Grand Prix bike the performance numbers you find are more guess work than fact. It all depended on the wrench tuning the bike, whether the parts found on the bike are from the beginning of the season or late in the season. The TZ750 was first rolled out in 1974 with 90hp at 10,000rpm, an amazing number at the time.
The seller claims history
THE BIKE HAS FACTORY PERIOD CORRECT REPLACEMENT CASES WITH 500 MILES ON REBUILD NO WELDINGOR CRACKS
IT HAS BEEN ACTIVELY CAMPAIGNED BACK IN THE DAY AT DAYTONA,GROTTEN,BLACKHAWK,ROAD AMERICA.WENTZVILLE,MID OHIO,POCONO,LAUDON,LAGUNA SECA,ASPEN,LAJUNTA,HALLET,TEXAS WORLD SPEEDWAY,BRAINERD AND WAS WERA NATL CHAMPION IN 1980
THIS WOULD BE A GREAT BIKE TO ADD TO YOUR STABLE FOR RACE OR DISPLAY
The D came out with the OW31 designation to indicate a factory as apposed to privateer bike. With many parts offered in Titanium and Magnesium the weight saved was close to 40 lbs compared to the privateer D mono shock TZ’s. Fine tuning of the pipes, porting, and crank were all development changes in the OW31. This TZ site claims that only 20 genuine OW31 TZ750 were produced, with all the other ones being Replicas of the factory effort.
I have posted other Grand Prix level vintage racers and always wondered with the cost of the purchase, how are you going to finance weekend to weekend racing? I can see one person having the technological know how to keep the bike running. But would this same person be the one throwing their leg over the bike? Good luck to you if you have the skills with the wrench and the handlebars to own and race this Yamaha TZ750 D OW31. Oh, and if you need a 500cc TZ to race in the smaller classes, the seller has this 1982 TZ500 on offer as well. BB