BORETECH CLASSIC REBUILD - 1986 YAMAHA YZ490


October 12th, 2017.


Here we have a true 'stroker' classic; a 1986 YZ490. It arrived at Boretech in a bit of a sorry state, fitted with a Suzuki RM petrol tank, a badly dinged exhaust and a nearly bald rear tyre. Basically, it was well abused and reluctant to start.


We carried out a full strip-down, followed by a nut and bolt restoration with a frame respray and new plastics all round.


A new, genuine Yamaha con rod kit was fitted and we rebored the barrel and fitted a new Wiseco piston. The engine cases were shot blasted and painted in-house and a full Pro Circuit exhaust system was fitted.

Both front and rear suspension systems were fully stripped, serviced and rebuilt using the best components and Rock Oil.

Both wheels were stripped, the hubs shot blasted and painted, then rebuilt with brand new rims and spokes, plus Pirelli tyres.

The top fork clamps were modified to take Renthal Twinwall handlebars and all the controls replaced.


Original period decals were sourced and fitted to give this classic the correct final touch.


The customer was happy and so were we!


For all motorcycle, automotive, ATV and kart engineering, rebuild and preparation services, parts and race consumables, contact: Boretech Engineering on 01273 495405, info@boretech.co.uk or visit www.boretech.co.uk
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