Having just had the first service done on my 350 Classic I thought I'd make some comments here which may be of interest to others.
Firstly, I had previously read that some dealers appeared to be doing the (mandatory according to RE) tappet check and adjust at 300 miles whilst others did not.
When I booked in for my service, they said that it would take a couple of hours and that they would do it while I waited. That made me suspect that they did not intend to do the tappets, as firstly the engine would be warm and secondly I don't think they would have had enough time (see below
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Whilst the service was being done I took a sneaky look into the workshop and noted that at no time was the tank removed.
The service cost £135 and I received a stamp in the book but no list of what had been done, just a receipt.
I rode home and left the bike overnight, intending to check the tappets the next day. I re-visited "Ride with Warro" on YouTube to remind myself of the procedure for removing the tank etc. and went ahead.
Removing the various parts went reasonably well, with just a few bruises and scrapes. Interestingly, I found the tappets in a similar condition to that found by Warro when he did his - there was no way that the 0.08mm feeler would fit in the inlet side, where there seemed to be no gap at all, and the outlet was smaller than 0.18mm, although there was at least some discernible gap.
Having adjusted to the correct gaps, I then faced the interesting problem of re-seating the rubber gasket when fitting the rocker cover. All I can say is that RE could surely have made this easier by not "gluing" the gasket in place on the left hand side of the head, so that it can't be removed to be placed into the rocker cover when upside down. ( I didn't have Mrs Warro to help me as he did).
Luckily it eventually went in, and there is no sign of oil leakage so far.
Replacing the tank was slightly tricky as the throttle cable was routed over the top of the left hand rubber mount at the front and the bracket on the tank kept jamming on the cable as I tried to wiggle it back on. I eventually gave up and moved the throttle cable underneath, it seems to be OK there, touch wood.
So my conclusion is that, even for an experienced mechanic, the tappet check and adjustment must be a fairly time consuming process and, if done by the dealer, would lead to disproportionately high first service bills (I say disproportionally high with reference to the cost of the bike)
I'm also very pleased that I took the trouble to check mine as they were clearly not in specification after 300 miles (before that - who knows?).
I'd be interested to know what other UK owners have paid and if they believe that their tappets were checked/adjusted at the first service.