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Bicycle Engine Kits – 2-stroke and 4-stroke.

Fosscati Motorised Bicycles are really involved in supplying fully built and customised motored bicycles that are reliable, beautiful and environmentally sustainable and that come with a warranty you can count on.  With the exception of the Rotary Bike Engine Kit we have ceased selling engine kits because of problems with the product and with the wholesalers.

PLEASE NOTE: Fosscati Motorised Bicycles no longer sell Grubee SkyHawk bicycle engine kits due, inter alia, to the failure of the Australian Grubee importer to supply essential spare parts needed by owners of  older models of engines and gearboxes.  Fosscati will, however, always service previous models of any Fosscati using specially imported spare parts from the USA.  A supplier that does not consider the ongoing needs of a customer with regard to the reasonable expectation that spare parts will be available for last year’s models does not deserve our custom.  If you wish to purchase a Grubee kit you will probably be better served by buying direct from the USA importer because they certainly provide much better follow-up services for spares.  With the dollars at parity it makes even more sense to buy from the USA and pay for air freight.  Why reward shonky service? – shop with discernment!

To see the full range of Rotary motorised bikes we sell please look at the bottom of the page on Fosscati Bikes – 2 Strokes

Rotary Australia Bike Engine Kit – $1550 (Engine Kit) inc GST + freight.

The indominatable Sachs motor and Rotary bike engine kit.

Precision engineered quality is clearly evident on the Rotary motor


  • All aluminium alloy ‘monocase’, with precision machined matched halves
  • Industrial hard-chrome plated cylinder bore, which gives long-life & good abrasion resistance.
  • ‘Wet’ centrifugal clutch unit contained within the crankcase not just for compactness, but also to increase clutch life via dissipating heat to incoming air mixture & lubrication via oil within air/fuel mix.
  • Internal ‘ AUTOMATIC ‘ reduction transmission with over-running clutch unit, which means you can pedal the bike without the engine running with NO EXTRA RESISTANCE.
  • Many components designed to address the difficult problem of engine vibration being transmitted to the bicycle frame, eg.. muffler-torque rod & forward damper, wheel spokes have all been designed to reduce transfer of vibration to the frame.


Weight of Power Unit: 8.2kg (not including wheel)
Maximum Power Assistance (Effective Power): 197 Watts @ 130r/min, measured at OUTPUT spindle (shaft HP).
Maximum speed under power: 24km/h with 26″ wheel (average 23km/h) on level ground
Fuel Consumption: approx 60km per 1L at a cruise speed of 15km/h (with 26″ wheel)
Fuel Requirement: Fresh U.L.P mixed with 2-stroke oil.
at a ratio of 50:1
Cubic capacity of internal engine: 30cc
Bore / Stroke of internal engine: 33mm x 36mm
Compression ratio of internal engine: 6.8:1
Sparkplug / gap: Bosch WR10FC / 0.5mm
Internal transmission reduction ratio: 27:1
Transmission oil / capacity: SAE 80-140 / 90ml
Clutch unit: ‘Wet’ centrifugal with self-energize arrangement


$1550 (Engine Kit)inc GST + freight.

Fosscati BM Trailer

See The Movie: Forza Fosscati – 4-strokes in action 

FORZA FOSSCATI – Motorized Bicycles in Action

About this video:
“4-stroke Fosscati Motorised Bicycles in Action in and around Mullumbimby, NSW, Australia”



FONO: 02 6680 5740

or, if calling from outside Australia:  (612) 805740

CELLULARE:  o431 417588

or, if calling from outside Australia:  +61431 417588


7 Comments leave one →
  1. Video Plumber permalink
    April 4, 2010 11:12 am

    I want to become a dealer in Grosse Pointe, Michigan

  2. Sylvia Davis permalink
    June 2, 2011 4:06 am

    I love your motorized bicycles. I am very much considering purchasing one of your motor kits. I would like to know if these bikes are hard to assemble yourself and do they last long on running.
    I look forward to hearing from you.
    Thank You so much,

    • July 4, 2011 2:56 pm

      Hi Sylvia, Thanks for your message. It would be nearly impossible to build yourself a Fosscati unless you were both Giacomo Fosscati and had 45,000 kms of riding experience. That is what takes to build bikes like these.
      They are incredibly reliable Sylvia and incredibly mood-lifting. Reliabilty comes first and looks come second.

  3. Craig permalink
    July 13, 2011 3:23 am


    I have a Lady Rotary bike in excellent condition, I’m trying to locate a Bing 81 carb for the bike and air filter. I’m in the US and I cant find anyone that sells this type of carb. I’m also looking for a new CDI for the bike as well, let me know if you have any leads.

    • July 14, 2011 12:19 am

      I’ve asked my supplier to tell me if he can supply the parts. Will contact you with an answer soon.

  4. Brett Harding permalink
    November 28, 2011 5:23 pm

    hi John could you please send us a wiring diagram for 80 cc power cycle and any other relevant information (spark plug) witch may help us to get the project up and running thanks Brett Harding

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