Classic Motorcycle Mechanics

RETRO REBOOT

Yamaha already has the perfect engine for a TRX reboot, so we say ‘do it!’

- WORDS AND IMAGES: KAR LEE

Yamaha’s TRX850 rebooted.

The 1994 Ducati 916’s success in World Superbikes, combined with its stunning good looks and a riding experience only a V-twin could deliver, helped to make it the iconic bike it is today and highlighte­d the fact that none of the main Japanese manufactur­ers at the time had a sports V-twin in their range. Both the Firestorm and TL1000S were three years away and Yamaha didn’t have a liquid-cooled V-twin motor, but it did have something that ‘felt’ like one... the 1995 TRX850 nabbed the parallel twin from the TDM850, put it in a trellis frame and gave it a 270° crank that mimicked a V thanks to its off-beat power delivery. Designed to take on Ducati’s air-cooled 900SS, the TRX may not have been a great seller at the time, but today it enjoys a cult following. With the crossplane-crank MT-07 parallel twin in the Yamaha range since 2014, perhaps Yamaha could find another use for the engine…

ENGINE

The original TRX boasted a humble 80bhp, most of it delivered in a slightly lethargic linear manner through its five-speed gearbox. The latest MT-07, although 150cc down, is only a few bhp behind. With a bored-out version of the MT-07 engine we could expect to see an easy 110bhp at the back wheel with 65lb-ft of torque. These numbers alone aren’t special until you factor in the light weight of our TRX reboot as a whole. A two-into-two exhaust system (with one outlet in the bellypan and another under the tail unit) helps maximise power gains.

BODYWORK

We’ve kept the TRX bodywork on the conservati­ve side as opposed to the angular, fussy designs the Japanese are so keen on nowadays. The headlights are a mix of R6 and R15 (a bike from the Indonesian market, go check) while the tank and tail have echoes of a modern YZF-R1. If the collector box and sump gubbins is too unsightly for you, then there’s always the bellypan option – available as a Yamaha official extra of course!

CHASSIS

For sportsbike performanc­e we’ve chosen a beam frame design based on the R6 and a trellis sub-frame as a nod to the original TRX. A braced swingarm sits at the back to handle the extra power while big 320mm discs and radial calipers handle decelerati­on duties. Overall this should give the new TRX plenty in the handling and braking stakes. We’ve even fitted pillion pegs this time… cmm

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