haha...don´t worry , my neighbor got this slight ticking for two years now with no issues at alland the engine is maintaned by me , so you can bet all is on spec !!
oh ok sweet, that makes me feel better
i searched the net and a few people are saying valves tick when theyre a bit loose so ill double check it again anyway
the valve is inside the engine block, but the bit you adjust it from is infront of the pipe going from the carby to the engine block.
there is a little cap there that unscrews and its under there.