Skrunkwerks R90 Scrambler

From speed to utility, salt to road, this build is a bookend to the Skrunkwerks salt racer. From the outset, focus was on practicality, comfort and performance. In short, a long-legged mile muncher that wont loose its lolli when the bitumen runs out. Plus some more ooomph than the stock R90. The large slab sided tank of the R90/6 spells Teutonic classic and is a solid model to form the basis of a build. But it can stand improvement in a number of area’s, these became the heart of the build’s mission.

  • Bike:1974 R90/6
  • The very ordinary stock ATE brakes and disk are replaced with a 4 pot Brembo (from a GSXR 750) and 330mm ECB rotor (for a Ducati 1198). Adaptors and spacers to accommodate this upgrade were supplied by R90X Big Brakes
  • Renthal FatBars with compact Ducati switchblock. All wiring hidden in bars. Daytona Speedo. After market headlight bucket. All wiring replaced with aid of Motogadget m-unit. Kellermann LED bar end indicators.
  • Stock tank with custom paint and kneepads of Tasmanian Tiger Myrtle by a maker of fine stringed instruments, Tim of http://timkillcustom.com/

  • Engine: Completely rebuilt from bare case including increase to 1000cc. Heads machined by Skrunkwerks to suit 1000c Siebenrock ‘re-power kit’ to avoid the stepped pistons of their ‘power kit’ for the R90. Head machining included a further compression ratio increase to 10:1.  More info here.
  • Fitted with a Skrunkwerks dual pattern performance cam. More info here.   Intake valve diameter increased to 44mm. Ported using in-house flowbench. 38mm Dellorto PHM carbs with velocity stacks for correct tuned length hidden under large K&N pod filters. Mufflers are DanMoto items (NLA I believe).
  • Stock airbox replaced with a Skrunkwerks carbon fibre rear engine cover.
  • Tractor sized stock flywheel replaced with the much lighter ‘clutch carrier’ of later models which also allowed the fitment of the much improved gearbox from a 1987 R100. Shifts are far less clunky.
  • Custom seat and subframe with luggage rack and brackets for Legend Gear saddle bags by SW Motech Germany. Of the many modifications, the sub-frame/rack took the longest. Cutouts were milled manually..
  • Kellermann all-in-one LED rear lights and bar end indicators.
  • Ikon rear shocks (15mm more height at rear).
  • Powder coated wheel rims with SS spokes and shod with Heidenau K60′

It’s a fun ride.

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