Plug gap should be 0.8 mm, NGK DPR8EA9. Valve clearances I usually set at about 0.08 inlet and 0.15 exhaust. This is from memory so could be wrong!
If the inlet valve is too tight it will give you trouble starting, also a saturated air filter (with thick oil). One last thing, don't be tempted to adjust tickover screw! My mate did that and we spent an hour kicking it one cold desert morning until he remembered he had adjusted it the night before!
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