Dazon Raider Extreme 1100D Service Manual download pdf (Page 32)

Raider-Classic 150 (Oil-cooled&Internal Gearbox): Service Manual (single/ double-seat) EEC Version;3.0 Feb..2005

b) If the contact position is too high, then cut out some of the upper

part of the valve seat with a 32º grinding cutter to reduce the

working face of the valve seat; if the contact position is too low, then

cut out some of the lower part of the valve seat with a 60º grinding

cutter to raise the working face of the valve seat.

c) Finally, grind the working face of the valve seat to the specific

width with a 45º grinding cutter.

If the valve seat still can’t contact evenly with the valve after

trimming, the valve should be revised or replaced.

3.9.4 Valve and Valve Seat Lapping

After finishing, the valve and valve seat should be lapped in order to make them seal properly.

Spread a thin layer of the silicon carbide on the working bevel of the valve, and repeatedly

rotate the valve suction cup to lap the valve and valve seat evenly until they match tightly.

3.9.5 Inspection of Valve and Valve Seat Air Impermeability

After lapping the valve and valve seat, the air impermeability of their joint surface should be

inspected.

Method one: the same as the method of "valve seat contact position

inspection”.

Method two: evenly draw several lines on the working surface of the

valve with a pencil. Put the valve into the valve seat, if the lines are all

broken after turning 1/8 - 1/4 rings, then it shows the air impermeability

is good.

Method three: mount the valve on the cylinder head, and fill the inlet and exhaust vents with

non-flammable solvent, and preserve for 5 minutes. If there is no leaking, the valve is seated

correctly.

 Before lapping, clean the valve, valve seat and valve guide.

 When lapping, don’t use too much force.

 During lapping, don’t drop any silicon carbide into the place between the valve leve

and the valve

uide.

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Dazon Raider Extreme 1100D Service Manual Page 32