HOBBY SUPPLIES "Australia" is the factory appointed Exclusive Australian Distributor for CMB Motori Italia. 

The full range of CMB Marine Engines, Tuned Pipes, Spare Parts and Accessories are always in stock.

CMB Motori Italia are world leaders in Performance Model Marine Engines and well known for their powerful, strong and reliable engines with high quality Italian craftsmanship. CMB Engines are the most used race engines at current World Championships in Europe and powered most class Winners !!!.  Over the past 30+ years CMB has won over 100 World Championship Titles and set many World Speed Records.

CMB only manufacture High End Competition Race Engines to enable our customers success at any level of competition. The latest range of performance CMB Engines feature many new technical advances to keep you in the winners circle this season.

Please follow the links on our home page for details and prices on the latest range of CMB Exhaust Headers and Performance Tuned Pipes

                 Visit Personal Currency Assistant™ to convert Australian Dollars to your Currency.

CMB .21GPX, 45GPX and 91GPX Tuning Kits 

The new 2023 .21GPX high performance tuning kit features the latest design 12 port Piston/Liner and Turbo plug head.

The new 2023 .45GPX high performance tuning kit features the latest design 10 port Piston/Liner and Turbo plug head.

The new 2023 .91GPX high performance tuning kit features the latest design 10 port Piston/Liner and Turbo plug head. (Will not fit new 2023 91 GPX Engine)

-  21GPX- Export Price AUD 296.40, Australian Residents $326.00 inc GST

-  45GPX- Export Price AUD 326.40, Australian Residents $359.00 inc GST

-  91GPX- Export Price AUD 358.20, Australian Residents $394.00 inc GST

CMB .21 BETA EVO Direct Drive 

The new 2024 .21 Beta EVO engine has been designed for circuit racing boats with nitro fuel. The latest model features a new re-designed crankcase with larger boost and transfer ports and new design Piston/Liner. Large bore drum valve intake with bronze bushed housing, standard plug head, separate bolt on Carburetor and R/C 3rd channel remote main needle valve.

-  2.9 HP / 34,000 RPM

-  Bore: 16.15 mm

-  Stroke: 17.00 mm

-  Displacement: 3.49 cc

CMB .21 GPX Direct Drive  

More Power, More Torque, More RPM

The new 2025 .21 GPX engine has been designed for circuit racing boats with nitro fuel. Features new design Zimmerman disk intake offering increased midrange torque and high RPM, new design GPX piston/liner, black crankcase, Turbo plug head, separate bolt on Carburetor and R/C 3rd channel remote main needle valve.

-  3.0 HP / 35,000 RPM

-  Bore: 16.15 mm

-  Stroke: 17.00 mm

-  Displacement: 3.49 cc

 CMB .45 V5

 CMB's CAM Style Drum is "BACK" now with longer stroke and even more power.

New 2022 version .45 V5 engine features new balanced crankshaft, new drum rotor, new design 7 port piston/sleeve and new head button.

More Power, More Torque, More RPM

-  4.5 HP / 28,000 RPM

-  Bore: 21.1 mm

-  Stroke: 21.4 mm

-  Displacement: 7.46 cc

CMB .45 RS EVO Hydro/Offshore

   New 2023 version .45RS EVO H/O engine features new wider crankcase but same bolt position as older RS version, new even stronger crankshaft, new design 5 port multi exhaust port piston/sleeve and new head button.

The new .45 RS EVO H/O crankshaft design offers greater stability at high RPM plus the crankshaft is supported by twin ball bearings. Also features a steel conrod with needle bearing big end and Zimmerman disk intake with increased section in central area. Includes a bolt on Carburetor with remote needle valve and new Gold anodised double water cooling head.

-  4.5 HP / 29,000 RPM

-  Bore: 21.8 mm

-  Stroke: 20.0 mm

-  Displacement: 7.46 cc

 CMB .45 GPX "Direct Drive" Hydro/Offshore

The new .45 GPX Direct Drive engine features a new design 10 port Piston/Liner, M-Line design crankshaft, Billet front housing with two bearings (one ball bearing and one needle bearing). Also features a steel conrod with needle bearing big end and Zimmerman disk intake with increased section in central area. Includes a bolt on Carburetor with remote needle valve, Standard plug head (Turbo head optional), new 6 bolt Green anodised double water cooling jacket and Black anodised crankcase.

Suitable for both Round Collet Drive and Square Drive applications

-  4.6 HP / 29,000 RPM

-  Bore: 21.8 mm

-  Stroke: 20.0 mm

-  Displacement: 7.46 cc

 

 CMB .45 M-Line "Mark Grim Competition" Direct Drive

 Available from Hobby Supplies is this 2025 special production .45 M-Line "Mark Grim Competition" direct drive engine.

Special factory assembled with M-Line/GPX 3 bearing crankshaft assembly, 45 M-Line piston/liner assembly with flat top piston, GPX black crankcase with 6 bolt Red water cooling jacket, Turbo plug head, bolt on Carburetor with Low End Needle Valve plus R/C 3rd channel remote main needle valve.

Suitable for both Round Collet Drive and Square Drive applications

-  4.6 HP / 29,000 RPM

-  Bore: 21.8 mm

-  Stroke: 20.0 mm

-  Displacement: 7.46 cc

 

IN STOCK

CMB .67HR EVO (Hydro Racing) 

  New 2025 CMB 67HR EVO engine comes with a new 8 port liner, new crankcase and blue water jacket.   

   The new 67HR EVO engine has been designed for circuit racing boats with nitro fuel for high RPM. The latest model features a new 8 port piston/liner, new crankcase with re-designed boost and transfer ports.

-  4.8 HP / 28,000 RPM

-  Bore: 24.6 mm

-  Stroke: 23.1 mm

-  Displacement: 10.97 cc

Out of stock - Arriving Mid April 2025

CMB .80HR (Hydro Racing)

New 2024 model is fitted with a new design Piston/Liner offering more torque and RPM, new CNC billet drum housing plus billet 12mm Carburetor with Low End Needle Valve.

The .80HR engine has been designed for circuit racing boats with nitro fuel. The latest model features a new re-designed crankcase with larger boost and transfer ports and a new design Piston/Liner. Also includes a steel conrod with needle roller big end bearing, large bore drum valve intake with bronze bushed housing, single plug head, bolt on Carburetor and R/C 3rd channel remote main needle valve.

-  5.0 HP / 27,000 RPM

-  Bore: 27.0 mm

-  Stroke: 23.1 mm

-  Displacement: 13.22 cc

IN STOCK

CMB .91 RS.3 Direct Drive

      All NEW 2025 CMB 91 RS.3 engine features a redesigned ABC Piston/Liner with 3 exhaust ports and 5 inlet ports plus Flat top piston. New black Crankcase, Red single chamber water cooling jacket with 6 bolts and 13mm Carb. with Low End Needle Valve. 

   The new 2025 .91RS.3 marine engine features a new crankshaft supported by twin ball bearings for greater stability at higher RPM. Also features a new ABC Liner, modified cylinder porting, 3 exhaust ports and 5 inlet ports, improved transfer and boost ports. Also features double fixed crankshaft with two bearings, steel conrod with needle bearings, thin Zimmerman disk intake with increased section in central area. Black crankcase with new Red single chamber water cooling jacket, single plug head, bolt on Carburetor and R/C 3rd channel remote main needle valve.

-  6.8 HP / 26,000 RPM

-  Bore: 27.5 mm

-  Stroke: 25.2 mm

-  Displacement: 15.0 cc

IN STOCK

CMB .91 GPX Direct Drive

 All NEW 2024 CMB 91 GPX engine features a redesigned GPX ABC Piston/Liner with 3 exhaust ports and 5 inlet ports plus Flat top piston. New black Crankcase with special alloy sleeve insert, Green single chamber water cooling jacket with 6 bolts and 13mm Carb. with Low End Needle Valve. 

This new 2024 CMB 91GPX direct drive engine includes all the performance features of the 91M-Line three bearing bottom end plus new design GPX ABC piston/liner, Billet front housing with rubber seal. Black crankcase with special sleeve insert, new Green single chamber water cooling jacket, single plug Turbo head, bolt on Carburetor and R/C 3rd channel remote main needle valve.

Suitable for both Round Collet Drive and Square Drive applications

-  7.0 HP / 27,000 RPM

-  Bore: 27.5 mm

-  Stroke: 25.2 mm

-  Displacement: 15.0 cc

IN STOCK

CMB .91 M-Line RS.3 Direct Drive

 Available from Hobby Supplies is this 2025 special production .91 M-Line RS.3 direct drive engine.

Special factory assembled with M-Line/GPX 3 bearing crankshaft assembly, 91 M-Line piston/liner assembly with flat top piston, RS.3 black crankcase with single chamber water cooling jacket and 6 bolts, single plug Turbo head, 13mm Carburetor with Low End Needle Valve and R/C 3rd channel remote main needle valve.

Suitable for both Round Collet Drive and Square Drive applications

-  7.0 HP / 27,000 RPM

-  Bore: 27.5 mm

-  Stroke: 25.2 mm

-  Displacement: 15.0 cc

IN STOCK

CMB 1.01 RS.3 Direct Drive

      All NEW 2025 CMB 1.01 RS.3 engine features a redesigned ABC Piston/Liner with 3 exhaust ports and 5 inlet ports plus Flat top piston. New black Crankcase, Red single chamber water cooling jacket with 6 bolts and 13mm Carb. with Low End Needle Valve. 

   The new 2025 1.01 RS.3 marine engine features a new crankshaft supported by twin ball bearings for greater stability at higher RPM. Also features a new ABC Liner, modified cylinder porting, 3 exhaust ports and 5 inlet ports, improved transfer and boost ports. Also features double fixed crankshaft with two bearings, steel conrod with needle bearings, thin Zimmerman disk intake with increased section in central area. Black crankcase with new Red single chamber water cooling jacket, single plug head, bolt on Carburetor and R/C 3rd channel remote main needle valve.

-  6.9 HP / 26,000 RPM

-  Bore: 29.0 mm

-  Stroke: 25.2 mm

-  Displacement: 16.6 cc

IN STOCK

CMB 1.01 M-Line RS.3 Direct Drive

 Available from Hobby Supplies is this 2025 special production 1.01 M-Line RS.3 direct drive engine.

Special factory assembled with M-Line/GPX 3 bearing crankshaft assembly, 101 RS EVO piston/liner assembly with flat top piston, RS.3 black crankcase with single chamber water cooling jacket and 6 bolts, single plug standard head, 13mm Carburetor with Low End Needle Valve and R/C 3rd channel remote main needle valve.

Suitable for both Round Collet Drive and Square Drive applications

-  7.0 HP / 27,000 RPM

-  Bore: 29.0 mm

-  Stroke: 25.2 mm

-  Displacement: 15.0 cc

IN STOCK

CMB 27 GPX "Ring" Gasoline Engine

New 27 GPX Ring engine features the latest version crankshaft, new design piston/sleeve with 1.0mm ring and new design head button.

CMB designed the new 27 GPX gasoline engine from the ground up using the latest in 2 stroke technology and manufacturing processes.

Features a removable Hard Chrome plated Brass Sleeve with light weight Aluminium Piston and 1.0mm Ring, Zimmerman disk valve induction,17.5mm Tillotson racing carburetor, Separate head button, High volume Green anodised water-cooling jacket, black anodised crankcase, magneto ignition system with separate high tension coil plus belt start pulley.

Bore: 32mm x Stroke: 33.5mm

RPM: 20,000+ ,  Weighs 2kg

Engine mounts available to suit 5" engine rails. (Detailed below)

IN STOCK

CMB 27 GPX "AAC" Gasoline Engine

New 27 GPX AAC engine features the latest version crankshaft, new design AAC piston/sleeve plus special AAC design head button.

CMB designed the new 27 GPX gasoline engine from the ground up using the latest in 2 stroke technology and manufacturing processes.

Features a removable Hard Chrome plated Aluminium Sleeve with light weight Aluminium Piston, Zimmerman disk valve induction,17.5mm Tillotson racing carburetor, Separate head button, High volume Green anodised water-cooling jacket, black anodised crankcase, magneto ignition system with separate high tension coil plus belt start pulley.

Bore: 32mm x Stroke: 33.5mm

RPM: 20,000+ ,  Weighs 2kg

Engine mounts available to suit 5" engine rails. (Detailed below)

IN STOCK

CMB Ignition & Head Clearance Setting Tool

Great tool for measuring Ignition Timing and Head Clearance on CMB plus Zenoah gasoline engines with 10mm spark plug threads.

Kit includes a high quality dial indicator with 0.01mm increments and 0-10mm range plus a 10mm threaded spark plug adaptor and detailed CMB instructions.

A must have precision tool for anyone modifying engines

IN STOCK

CMB Gas Engine Rubber Isolation Mount Kit 

Available to suit CMB 27 and 35RS gasoline engines with 5" Engine Rails. Kit includes all hardware to mount the engine as shown in picture.