Each cylinder head dome includes a dome locking system that prevents it from spinning when servicing spark plugs. Not all cylinders are the same and compression may vary.
NOTE: All Cylinder Head Domes Are Sold Individually.
- 82mm domes (701) intended for use with 81.00mm to 83.50mm piston size.
- 85mm domes (760) intended for use with 84.00mm to 85.50mm piston size.
701cc Compression Chart
82mm Chamber 701 (61X) No Porting @ Sea Level
(NOTE: Stock 701 Cylinder is 81.00mm)
- 29cc = 230psi
- 31cc = 210psi
- 33cc = 195psi
- 35cc = 185psi
- 37cc = 170psi
- 39cc = 160psi
760cc Compression Chart
85mm Chamber 760 No Porting @ Sea Level
(NOTE: Stock 760 Cylinder is 84.00mm)
- 32cc = 225psi
- 34cc = 215psi
- 36cc = 195psi
- 38cc = 185psi
- 40cc = 170psi