Roth Engineering

2011 World Championship competitor
BuilderLasse Sundberg
OwnerLasse Sundberg
LocationUpplands Väsby
Countryflag se Sweden
Bike Name1668
Year/Model2011
Engine Make/SizeHusqvarna 550cc side valve 1923
DrivetrainHusqvarna 3-speed 1923
Frame Make/TypeRoth Eng. Single loop.
Front EndRoth Eng. Druid.
Rake48 degrees.
SwingarmRigid.
Wheels FrontClincher rim, Jammer hub.
Wheels RearTriumph rim, HD front hub.
Tires FrontFirestone Racing. 28x2 1/4
Tires RearAvon. 4.00s19
Brakes FrontRoth Eng. outside band brakes
Brakes RearRoth Eng. outside band brakes
PainterAirbrush studio Stockholm.
Chroming/PlatingBålsta Metallsliperi.
Additional InfoCarb: Amal premonoblock. Floor boards: Husqvarna 1920. Left clutch, right brake. Handlebar: by owner. Left shifter, right throttle, operated by links. Grips: Husqvarna 1920. Stainless exhaust: By owner. Seat: Brooks. Alternator: Indian 12v. Belt drive: Harley Davidson FXR. Narrowed. Front pulley from old top fuel bike. Hydraulic/wire brake system. Hydraulic clutch. Front light: Indian 1915 side car. Rear light: Phone switchboard indicator light.
Druid type front end, frame, rear fender, brakes, fuel and oil tank, battery box, controls: By owner. Oil system modified from total waste to circulation. Engine bored to 600cc. Ignition: Thunder heart twin cam. Coil and ignition box in left tank. Ignition adjustment made with laptop. Crank sensor HD, trigger plate by owner.
Everything handmade. No CNC used.

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Photography courtesy of Onno Wieringa

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