is it a knocking or a ticking?
if the oil is old and thinning the cams can get noisy.
if the plug cap is loose it may arc to the rocker cover and tick. That #3 cylinder plug also gets rain on it when parked outside.
if there is an air leak into the exhaust it will tick also, as the fresh air will ignite any unburnt fuel (actually provdes an emissions improvement lol) - this can happen at the head, but I had it happen where the two rear headers bolt to the mid-pipe which put the ticking down behind the right footpeg but could be mistaken for the #3 cylinder. Do check this as the nuts eventually rattled off and suddenly gave this awesome burbling noise from under my seat. Loved the noise but not the fire hazard
lol most of these bikes tick anyway - but it never hurts to check. I'll be doing mine in a week or two as part of my 40k service, so maybe we could swap some shims around?
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