What does the "tick" sound like?? The R-RT is an air/oil cooled engine and some noise is normal. If noise is very loud, it could indicate a problem with valve train or any number of other things.
Does noise stop when you pull clutch in with trans. in neutral?
When were the valves last checked/adjusted? Was rocker arm end play checked as well as valve clearance?
Sorry, more questions than answers
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