Yamaha Tri­als 2017

Trial Magazine - - NEWS -

The trip to the Ja­panese World round al­ways gives you an up-close and per­sonal look at what the Yamaha tri­als team is devel­op­ing. The tri­als project is led by Kimura San, who, Trial Mag­a­zine editor, John Hulme has known for many years start­ing with the mono-shock Yama­has in the eight­ies.

The lat­est pro­to­type ma­chine is code-named the 250F and was rid­den by the 38-year-old Kenichi Kuroyama. This new for 2017 ma­chine fea­tures the re­verse cylin­der Yamaha YZ en­gine housed in a mod­i­fied frame from the old four-stroke model, mar­ried to a 2017 two-stroke Scorpa rear end. Sus­pen­sion at the front is from the Tech brand whilst at the rear an Oh­lin’s shock ab­sorber with a re­mote cool­ing reser­voir is used.

Many hand-fab­ri­cated parts are used and this ma­chine is ob­vi­ously a de­vel­op­ment model, and in truth looks very hand-built. The rear-fac­ing ex­haust port has cre­ated the big­gest headache as Kimura has had to in­tro­duce a big front pipe to try and calm the huge amount of power from the fuel in­jected en­gine. Other novel weight-sav­ing engi­neer­ing ex­er­cises have been car­ried out such as drilling the front wheel rim be­tween the spoke holes, very much like on the cy­cle tri­als bikes, and the fab­ri­ca­tion of an alu­minium air fil­ter box.

John Hulme: “It’s al­ways good to see Kimura San, who I have known since the John Shirt Snr days at the back-end of the Majesty Yamaha tri­als project and the start of the Mono-shock project in 1983. He is a very po­lite, mod­est guy who gives noth­ing away about a Yamaha re­turn to tri­als. When I ques­tioned him about the en­gine ca­pac­ity in the new tri­als ma­chines and the weight it was a po­lite, “I can­not say”. He al­ways speaks about the good times with ‘Shirty Snr’ and I am sure in his heart he would love to see a new pro­duc­tion Yamaha tri­als ma­chine; I know we would”.

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