RD400 Performance Radial Heads
Yamaha RD400 Performance Radial Heads
Also known as DG Heads, Starburst Heads, Ottco Heads, or Radial Heads.
Sold as a set of 2 heads with Precision ground washers
Includes slim line spark plug wrench on the Gold heads. The polished heads have been updated so a special wrench is not needed.
1979 Daytona, Must use the standard RD400 head gaskets.
Head Gaskets NOT included,
SCR Performance Heads
Gold Anodized or Polished Silver
Scott Clough Racing (SCR) Performance Combustion Chamber 23.7 cc with a more aggressive squish band, Developed to work on Stock up to stage 2 ported engines. Got a full blown racer then you need to call us.
WHO? WHAT? SQUISH?
WHO? Scott Clough. Knows more about a two-stroke head design and has the ability to design and set up a design that is the most effecive head design needed per application. SCR holds AHRMA records, Land Speed Records (RZ350), Road Races Championships, and builds Isle of Man Racers.
WHAT? SCR adjusted the compression ratio, squish angles, squish clearance, squish velocity, and combustion chamber shape to optimize the combustion process and increase power.
SQUISH? This is the clearance between the piston and the squish band of the head when the piston is at TDC. It has a strong influence on turbulence in the combustion chamber, which directly affects how fast the mixture burns.
Very noticeable performance gain, HP increase numbers will vary from bike to bike determined on porting, exhaust, and intake setup.
Will you need to Re-jet? Most likely
Uses the Stock RD400 Head Gaskets