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Norton Commando 750cc Long-Rod Billet Piston Set

Norton Commando 750cc Long-Rod Billet Piston Set

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Do the job right and buy the very best piston set available for your Norton! More information below:

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Get the very best pistons available for your vintage Norton! Manufactured from 4032 aluminum alloy, they’re the ultimate piston for air-cooled engines!


  • Norton Commando 750 and Atlas 745 with long-rod conversion (see MAP7063 stroker rods)


  • Race proven and tested under the harshest conditions
  • High-silicone content for super strength!
  • 4032’s low-expansion properties allows for tighter running clearances which reduces needless engine noise and extends piston life
  • Each billet piston is fully CNC machined using the latest SolidWorks software resulting in the lightest possible weight and even heat distribution throughout
  • One of the lightest, commercially available, vintage, British bike, piston kit on the market
  • Micro-grooved piston skirt for longest life and resistance to scuffing
  • Second ring-land accumulator groove helps prevent the unloading of the top ring from trapped blow-by gases
  • Updated wrist-pin oiling with four pressure-fed location holes. This increases oil volume to the pin and limits heat buildup in the small end of the rod and wrist pin
  • Dual clocked pin bore grooving holds and disperses the oil around the wrist pin
  • Race-proven ring pack built by the highest quality, performance ring manufacturer (see ring specs below). Modern metric sizing for the least amount of friction with the best heat transfer for cooler running piston and longer piston life
  • Tapered wrist-pin inner diameter for rigidity and lightweight
  • Race-type SpiroLoc wrist pin clips for added reliability - they will not ever come out!
  • Our piston kits are race-tested world wide!
  • Compatible with Nikasil plated bores


  • Two race-proven, billet alloy pistons
  • Two sets of high-performance piston rings
  • Two lightweight wrist pins
  • Four SpiroLoc wrist pin clips
  • Full installation instructions

Piston Rings:

  • 1.0mm Nitrided stainless steel barrel-face top ring
  • 1.2mm Ferrox iron “Napier-style” second ring
  • 2.8mm Nitrided stainless steel rails with expanded (three-piece design) oil ring

Component weights:

  • Piston  (based on standard size piston)

MAP9032A     750cc  Long Rod     8.5:1 compresion          (9:1 Combat - No modifications required)             183 grams

MAP9033A     750cc  Long Rod     9.75:1 compression      *(Combat requires mods - see note below)          197 grams  

  • Pin with clips:  60 grams
  • Rings:  16.5 grams


  • Use of the MAP9033A piston set (9.75:1 compression) will require some modifications to the cylinder head. When using these pistons, the cylinder head must be machined to allow the dome to sit slightly deeper into the combustion chamber without collision.    


Additional Information

Piston Material Billet - 4032
Manufacture MAP Cycle
Country of Manufacture United States
Additional Information

Additional Information

Piston Material Billet - 4032
Manufacture MAP Cycle
Country of Manufacture United States

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Fitment Information

Norton Models

  • Norton Atlas 745 1962 - 1969
  • Norton Atlas Scrambler 1964
  • Norton Commando 750 1968
  • Norton Commando 750R 1969 - 1970
  • Norton Commando Fastback 750 1969 - 1973
  • Norton Commando Fastback LR 750 1971 - 1973
  • Norton Commando Hi-Rider 750 1971 - 1975
  • Norton Commando Interstate 750 1972 - 1973
  • Norton Commando Production Racer 750 1971 - 1973
  • Norton Commando Roadster 750 1971 - 1973
  • Norton Commando Roadster Combat 750 1972
  • Norton Commando Scrambler 750 1971
  • Norton Commando Scrambler 750S 1969 - 1970
Product Question

Product Questions

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Hi, I would like to know if you still supply the long rods for the commando
Are these pistons available in "oversize" diameters (i.e,. +0.010. +0.020, etc.) to allow for re-bored cylinder barrels?
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