HONDA CB-750 DOHC 1981- 89. VALVE SEAT CUTTERS KIT CARBIDE TIPPED. KIT CONSIST OF AS BELOW. INTAKE – – 45 DEG. EXHAUST – 45 DEG. THROAT BOTTOM BUT – 60 DEG. GUIDE STEM GUIDE STEM 5.5 mm. GUIDE REAMER HSS 5.5 mm. PLEASE FEEL FREE TO ASK ANY QUESTIONS.