Updated: December 29, 2001

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YAMAHA WRENCH REPORT: 1985 Yam Tri-Z
This is a reproduced article from the January 1985 issue of 3&4 Wheel Action magazine. This information was pulled from a Yamaha Wrench Report several month's after the Tri-Z's release.

Some of the recommended aftermarket parts may have changed or are now unavailable. The Yamaha modifications still apply and may be used to improve overall performance of the Tri-Z.

OKAY...
You're sick of red and don't really care how mondo the new ATC 250R is. It could be turbo-injected with a toaster mounted on the handlebars, and it still wouldn't change things. You've forked out the change for a new Tri-Z Yamaha, and you love it. A little more engine juice wouldn't hurt and injecting a slice of life into the wallowing, too soft suspension would be a welcome relief. What's the plan? The wallet is thin, the bucks are short.

WITH A LITTLE HELP FROM OUR FRIENDS...
There's a department at Yamaha Motor Corporation that deals with the testing and development of Yamaha's equipment. These surgeons spend countless hours at the dyno with bloodshot lips and bulging eyes, seeking methods of improving their machines. At the dyno they learn which mods show substantial gains; in the field they test their findings to see if they actually work. The results are sent out to their dealer network. These sacred studies are labeled the Wrench Report.

TEMPLE OF THE SOOTHSAYER
The Yamaha Wrench Report deals with cost-effective ways to modify and dial-in your machine. Most of the mods deal with coaxing more power out of the stocker, plus suspension setup and tuning. Dealing with the demand for more charge out of the powerplant is handled in two stages: the moderate level and the race-face plateau. Both start with similar porting updates to the cylinder. The big-time racer stage is suggested for experienced riders who can manage the high-rpm, fine-Iine powerband characteristics.

Continued...