JHS Racing Bristol & South West motorcycle workshop and performance centre Bristol & Bath motorcycle MOT test centre
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Motorcycle MOT test Bristol

JHS Racing are UK suppliers of high quality performance motorcycle parts & accessories:

Ohlins suspension sales & service Bristol Hel motorcycle brake lines Bristol
M4 motorcycle exhaust systems Brembo motorcycle brakes sales & service Bristol
Yoshimura motorcycle exhaust systems
Akrapovic motorcycle exhaust systems Dynojet Power Commander sales & service Bristol
Remus motorcycle exhaust systems Sigma motorcycle slipper clutch

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Suzuki SFV650 super twin racing motorcycles  

Custom-built Supertwin racing & track motorcycles

The Supertwin is an an uprated version of our Suzuki SFV650-based racing motorcycle.

JHS Racing have a distinguished record of developing competitive racing motorcycles at many levels, including the British Supersport series, record-breaking success at the Manx in 2011 (click here for details), and regularly competing with our Suzuki Supertwin in the Lightweight TT. This race-proven knowledge and experience is applied to every machine that we build.

The Supertwin build is similar to that of the Minitwin and includes most of the same components. The primary difference is that the Supertwin's engine work is far more extensive to achieve significant power gains, together with higher specification suspension and braking components. The level of spec on these machines can be adjusted up or down according to your budget and specific requirements.

See more on Photo Gallery page See more pictures of our Suzuki SFV650 Supertwin on our Photo Gallery page...

Our Suzuki SFV650 Supertwin racing motorcycles are supplied fully regulation-compliant and ready to race, with aftersales telephone support (during normal office hours) for 1 year.

Typical specifications of our built-to-order racing machines are described below:



  Race Parts for the SFV650
JHS Custom CP race pistons Suzuki SFV650
JHS custom CP pistons - from 199.99 +VAT each
JHS race conrods for Suzuki SFV650
H-beam racing con-rods - from 221.99 +VAT each
JHS close-ratio gears Suzuki SFV650
Close-ratio gearbox - from 999.00 +VAT

  Supertwin Suzuki SFV650-based racing motorcycles

  Click on images to enlarge
JHS Supertwin racing motorcycle - Click on image to enlarge JHS Supertwin racing motorcycle - Click on image to enlarge JHS Supertwin racing motorcycle - Click on image to enlarge
JHS Supertwin racing motorcycle - Click on image to enlarge JHS Supertwin racing motorcycle - Click on image to enlarge JHS Supertwin racing motorcycle - Click on image to enlarge

JHS Racing SFV650 RR Supertwin

Our Supertwin machines are eligible for Irish racing series, Manx & TT.

The base motorcycle is completely stripped and the frame is modified to suit. JHS Racing billet yokes clamp GSX-R600 forks, which house a K-Tech 25mm cartridge kit. A K-Tech 35mm DDS shock supports the rear and is linked to the JHS Racing swingarm via a revised linkage. Supertwin rules dictate that additional components have to be from the original manufacturer, so GSX-R600 wheels are used and Avon tyres are fitted. An underslung caliper is used for the rear brake, while Brembo calipers from a GSX-R600 supply the front braking power. Hel lines add initial bite and outright stopping power.

Additional modifications include:

  • Lightweight lithium battery
  • JHS Racing bespoke supertwin exhaust
  • JHS Racing clip-ons
  • Air filter
  • Power Commander V with ignition timing control and Autotune
  • Airbox is standard but JHS Racing billet bellmouths are used
  • Throttle bodies bored out to specification
The SFV engine is completely stripped and the following is undertaken:
  • Modified crankcases to aid strength
  • Machined to take an oil cooler
  • Nova close-ratio gearbox
  • JHS Racing con-rods
  • Forged piston kit
  • Cylinder heads are gas flowed in-house
  • Stock valves replaced with flat-face titanium valves
  • Valve spring kit
  • Titanium top collar kit
  • Kent cams
  • Sigma slipper clutch
  • 95-100bhp at the rear wheel

Prices vary based on actual build specification requested.
Prices from 14,000 +VAT


  2016 Isle of Man TT.   16-02-2016

JHS Racing will be back at the Isle of Man TT for 2016 with a three-rider squad ...

Read more ...


  JHS Racing Limited, Unit 3-4, Unity Court, Unity Road, Keynsham, Bristol, BS31 1FU

0117 986 8844

Registered in the UK no. 6399852
All material Copyright © JHS Racing Limited

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