Raider Pro 250 (single-seat / double-seat): Service Manual EEC Version: 1.0 Oct.. 2004
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3.8.11 Inspection of Spark Plug
a. Check if the spark plug is burnt or has become dirty.
Check if there is any carbon on the spark plug;
b. Clean the spark plug if necessary;
Specifications: Spark Plug: D7
Spark Plug Gap: 0.6-0.7mm
3.8.13 Compression
Specification: 11.0-15.0kg/cm2 (400rpm).
Trouble Shooting
The compression is too low.
a. The valve leaks;
b. The valve clearance is too big;
c. The cylinder head gasket is damaged;
d. The piston rings are worn;
e. The piston rings and the cylinder are worn.
The compression is too high.
a. There is too much carbon in the combustion chamber and on the piston head.