Cylinder Heads

 

In the early days of the 2 stroke bicycle motor, performance tuners found unacceptable wear and destruction of their China Girl engines. Before Frederic Chelminski developed the Fred Head, the catastrophic failures caused by overheating which were commonplace have now been eliminated. The sucess of this design has enticed many other vendors to emulate this cylinder head design. You will find many claims of superior performance from these other vendors, however CR Machine maintains the lead by the continuing refinement and improvement of the design. Race leaders continue to use CR Machine's winning race proven designs.

7.0S "stepped" head 8.0cc extra low compression center fire head
7.0S "stepped" head 8.0cc extra low compression center fire head

7.0 "S" head for stroker engines

Extra low compression 8.0 cc "Bonneville" head.

Cylinder head nut spring washer set New 5.5cc slant head
Cylinder head nut spring washer setNew 5.5cc slant head

Cylinder head nut spring washer set

New 5.5cc slant head

NEW Competition Center Fire Cylinder head Stage 2  [6.0cc]Cylinder Head 66/80cc
NEW Competition Center Fire Cylinder headStage 2 [6.0cc]Cylinder Head 66/80cc

New, improved performance competition cylinder head for 10mm spark plug

The original Fred Head for ONLY $64.95! Stage 2 [6.0cc]Cylinder Head 66/80cc: For moderately advanced engines using normal pump fuel, or highly advanced engines using racing fuel.

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Stage 2 Cylinder Head w/Compression Release 66/80cc Stage 2 [7.0cc]Cylinder Head 66/80cc
Stage 2 Cylinder Head w/Compression Release 66/80ccStage 2 [7.0cc]Cylinder Head 66/80cc

New angle fire compression release head 6.0 - 7.0cc chambers

7.0 cc centerfire head for advanced engines using pump fuel.

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Stage 3 Twin Plug Cylinder Head 6.0cc w/Comp Release 66/80cc 6.0cc Twin Plug Cylinder Head 66/80cc
Stage 3 Twin Plug Cylinder Head 6.0cc w/Comp Release 66/80cc6.0cc Twin Plug Cylinder Head 66/80cc

Stage 3 Twin Plug Cylinder Head 6.0cc w/Compression Release 66/80cc:

6.0cc Twin Plug Cylinder Head 66/80cc

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