I spent a lot of time making sure that when there is an event at this venue, the calendar on this website shows an accurate map that you can zoom into and out of. Also the lat & long figures are there for online mapping or satnav.
Does it not work properly? if it doesn't I need to do some more work.
It's always upsetting when you buy a second hand bike and find problems or potential problems but don't panic, a used bike is a used bike and will always have wear and reduced performance compared to a new bike.
The effect of having no air filter is that abrasive media (mainly sand and dust) will have entered your engine in greater quantities than in an engine with a clean oiled foam air filter.
This accelerates the wear rate in piston rings, piston, big end bearing, main bearings, little end bearing. Generally in that order.
Note I said 'accelerates the wear rate' not 'ruins'
However, I'm assuming you rode the bike before you bought it and were happy with the engine?
In that case fit a new filter, oil it, and ride the bike, don't worry about problems that aren't there.
Since you are based in Tyneside, I'm assuming you will ride North East Centre ACU trials.
We do a lot of waterwork, on the 2 Shercos I had this meant a carb clean and air filter clean after every trial.
Get used to it, keep a spare clean dry filter and it's half an hour to an hour maintenance per trial (when you wash the filter out it takes a couple of days to dry properly so you need a spare)
Trials bikes are high maintenance no matter what
On a used bike I'd be lubricating all of the suspension bearings straight away, then every 3 months, changing the fork oil and gearbox oil after a couple of trials, then every 6 months, but carb and air filter every trial.