I take it you mean the bike intake clearances are tight, not the gin intake clearances?
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I’m sure the gin never touched the sides!
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Gin isn’t used for clearance, it’s part of the lubrication system 
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I’ve always used it for fuelling.
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Bloomin typical…the actual “job” of valve clearances went without issue!
But to get to the valves you need to remove the valve covers…and to remove the valve covers you need to remove the thermostat…
The thermostat housing was so furred up…I decided to break it apart for a clean up - makes sense, right…?
Fate had other ideas…
Sheared bolt!! 
No heat, Plusgas, or tap tapping with a punch can shift it… 
Replacement housing on its way (£17)… 
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So…all done…to the best of my ability.
Carbs stripped cleaned and rebuilt
Valve clearances done.
Carbs balanced.
New plugs
New air filter
However…I still get a pop on the over run…
I don’t overly mind. It kinda suits the ruggedness of the bike…
But…I had hoped, maybe just thought, that these jobs would have stopped the pop. But it hasn’t.
Any reasons for, or what causes the pop on the overrun ?
When I started from cold …it popped upon start up too.
Bike rides great…just trying to understand.
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Have you got it really hot or just little test runs?
Hot. Half hour through traffic…
I have since been advised that it’s likely the exhaust blowing…
And these are…
What’s the best way to seal them - they are already done up tightly, so guessing it could do with some gasket seal etc?
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I once had a 1950s 350 Goldie. Shutting the throttle and raising the exhaust valve lifter produced wonderful bangs from the exhaust, much to the alarm of passers-by. (I know… I wasn’t always a responsible citizen.)
I suppose your Honda doesn’t have a valve lifter. 
Have you checked the ignition timing?
Not a recommendation, but my first bike (a CZ125 two stroke) used a rubber o-ring as a seal at the join to silencer. Needless to say, on a 300 mile run up to Scotland this melted and I jurry rigged a solution at a services by cutting up an aluminium coke can into strips to wrap around pipe in place of the o-ring, and held it in place with a jubilee clip bought from a garage. This solution served me well, and I redid it after later trying a replacement o-ring which also melted.
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Thanks all
Sealent acquired…will decide if it neccessary to apply!
Meanwhile…fork seal replacement brewing…
Watch
This
Space…
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