Prussian Blue Marking Compound
Prussian Blue Marking Compound

Prussian Blue Marking Compound

Your Price: $10.00
In Stock
CMC Part Number:9055
  • OEM Part:9055
  • Qty:Sold Individually

Part: Prussian Blue 

Why You Need This: Prussian Blue is a non drying marking compound used check the contact surface of  a valve face to valve seat when working on a cylinder head.  If you are replacing your valves with new ones or simply lapping and reinstalling the original valves on your Honda CB350 / CB360 / CB450 / CB550 engine, then Prussian Blue is needed to determine the proper fit and seal between the valve face and seat. Since it is impossible to see how well a valve and seat fit together after years of wear, Prussian Blue is applied evenly and thin around the valve face and pressed it into the matched seat to check the consistency of the face contact the two parts make. This is done pre-lapping to determine the initial state of the parts and post-lapping to see if the lapping process was successful.  

Sold as a .75 FL oz tube, one tube will do many valve jobs. 

Installation Tip:  If you are replacing your engine valves then they must be lapped to the old seats in the head. Apply a thin even coat of Prussian Blue to the valve face. Press the vale to the seat (do not rotate the valve during the checking process), remove and check the seat for contact (where the blue has transferred). Wipe clean and rotate the valve 90 degrees and test again, Repeat two more times to ensure the valve and seat are making good contact. Thin, spotty or incomplete contact means the valve seats will need additional lapping or cutting to bring back them back to true. Do not squeeze on the gel like toothpaste along the surface. 

NOTE: Valve guides must be within service limits before attempting a valve lap. If not replace valve guides first. 

This Prussian Blue Is Used On These Honda Motorcycles
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
CT90 CT90K0 CT90K0 CT90K0 CT90K1 CT90K2 CT90K3 CT90K4 CT90K4 CT90K5 CT90K6 CT90K7 CT90K8 CT90K9
CB100K0 CB100K1 CB100K2 CB100K2 CB100K2 CB100K2
CL100K0 CL100K1 CL100K2 CL100K3
CB125 S0 CB125 S1 CB125 S2 CB125 SA CB125 SA CB125 SA
CL125 S0 CL125 S1 CL125 S1
175 CB175K0 CB175K3 CB175K4 CB175K5 CB175K6 CB175K7
CL175K0 CL175K3 CL175K4 CL175K5 CL175K6 CL175K7
SL175K0 SL175K1 SL175K1
200 CB200K0 CB200K0 CB200T CB200T
350 CB350K0 CB350K1 CB350K2 CB350K3 CB350K4 CB350K5
CL350K0 CL350K1 CL350K2 CL350K3 CL350K4 CL350K5
SL350K0 SL350K0 SL350K1 SL350K2 SL350K2
360 CB360G CB360T CB360T
CL360K0 CL360K1 CJ360T CJ360T
CB450K0 CB450K0 CB450K0 CB450K1 CB450K2 CB450K3 CB450K4 CB450K5 CB450K6 CB450K7 CB500T CB500T
CL450K0 CL450K1 CL450K2 CL450K3 CL450K4 CL450K5 CL450K5 CL450K6
CB350F CB350F CB350F CB400F CB400F CB400F
CB500K0 CB500K1 CB500K2 CB550K0 CB550K1 CB550K CB550K CB550K
CB550F CB550F CB550F
750 CB750K0 CB750K0/K1 CB750K1 CB750K2 CB750K3 CB750K4 CB750K5 CB750K6 CB750K7 CB750K8
CB750F0 CB750F1 CB750F2 CB750F3
CB750A CB750A CB750A

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