I agree Gareth that it’s designed to be up to temp and running but with the cam not held securely that would give less slack as the cam COULD be a tad higher than when clamped but not more. I will try your suggestion Bryan but can’t get to mine for a few days yet as other things are more pressing. Everything on mine is new Honda apart from the crank and cam sprocket teeth - the only other places where a tiny bit of wear might take place. The horseshoe I repaired with a new rivet swings as free as a soap opera couple.
As you say Bryan, not a very good system, but it did work and not sure Mr Honda would have been happy with people screwing down too hard on a bolt pushing the horseshoe instead.
Ian