: 351°

(314-314)

: 340°

(314-314)

: 266°

(226-226)

: 256°

(225-225)

: 12.95mm

(11.45-11.45)

: 12.00mm

(11.50-11.50)

: 7.50mm

(6.65-6.65)

: 6.90mm

(6.65-6.65)

: 104°

(100-100)

: 100°

(104-104)

: 28° / 58°

: 47° / 29°

: 4.40mm

(2.30-2.30)

: 4.30mm

(1.95-1.95)

check interference between cam and rocker arm, modify rocker arm if required

Around the year 2004, Honda changed the valve locks and spring retainers for the K20 and F20 DOHC engines. The older engines have a combination with a 1:4 angle, the more recent engines have a 1:5 angle. The new valve locks can be recognized by 4 arrows on the top surface, the retainers have 2 dots on the top surface. Please make sure to order the correct parts.

Cat Cams retainer for old type (1:4): 99356/S

Cat Cams retainer for new type (1:5): 99485/S

This engine is very sensitive on valve clearance. A valve clearance that is too big will result in poor performance, damage to valve and valve seat, and ultimately possible breaking of the valve.

The optimum cold setting is usually around 0.20mm (intake-exhaust). Don't exceed the valve clearance data as indicated in the Honda workshop manual.