Honda CB350 CL350 [36/219] Cam case and cylinder head

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и3 2 CAM CASE AND CYLINDER HEAD 4 Valve seat width Inspect the width of the valve seat by applying a thin coating of bluing or red lead on the valve face and after inserting the valve in the guide turn the valve while firmly holding is against the seat The impression left on the valve seat will indicate the seat width and also the condition of the seat Fig 3 39 5 Valve seat The valve seat is repaired with three types of cutter valve seat surface cutter valve seat interior cutter and valve seat 90 cutter The relative location and the width of the valve seat contact area is accomplished with the valve seat surface cutter and valve seat interior cutter while the refacing of the valve contact area is preformed by the valve seat 90 cutter Fig 3 40A For lapping the valve with the valve seat use a sucker a suction cup lapping tool After applied a small amount of fine lapping compound on the valve seat face lap the valves while holding the sucker with both hands and apply a slight pressure by tapping while rotating to the right and left a The valve seat contact width in good condition is about 1 mm 0 04 in and which contact width should be even on the e ntire contact surface b The lapping compound should be washed off thoroughly with cleaning solution after lapping operation c After the valve is set in pour a small amount of engine oil into the combustion chamber and blast air in from the inlet and exhaust ports If no bubble appeared on the valve seat area it is an indidation that the valves are well seated Fig 3 38B M Valve and Valve Spring Reassembly 1 Assemble the valve valve spring seat and valve spring retainer into the cylinder head and assemble valve with the valve cotter by using the valve assembly tool Tool No 07031 25001 NOTE The valve spring has a dual pitch make sure that the end with the smaller pitch is installed toward the seat Fig 3 41 2 Assemble the cylinder with section 3 2 D head in accordance 25

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