Yamaha lists a variety of special tools in their 2013 shop manual for the XT250. Having a long history with motorcycles, including a short spell where I worked in the parts department of a Honda shop a million years ago, I know that some special tools are completely unnecessary. I also know that some may be entirely necessary while others make may make a job easier than doing it without them.
I've recently purchased a 2014 XT250 (unchanged from 2013, I believe) and may wish to do some of the maintenance work myself. I'm rapidly approaching 600 miles on the odometer, the point of the first recommended servicing. For me, I expect the oil and filter change to be no sweat, but I'm a little concerned about having the necessary tools for adjusting the tappets. Yamaha lists a 6 piece tappet set YM-A5970 in the shop manual. My first question is if this is one of the necessary special tools, helpful special tools, or unnecessary special tools?
Next, for setting the idle speed a tachometer would seem to allow for something more accurate than me doing it by ear. The one listed in the shop manual turns out to be for a Oppama Pet-1100 Pulse Engine Tachometer which sells for about $130. A nice thing about the Oppama is that it is a pulse tachometer and you only need to bring it near the engine and don't even need to clamp it onto anything. I know there are other pulse tachometers available and at $130 the Oppama is a too pricey for me. There are also clamp on tachs which need to be clamped over the spark plug wire. One such is the Easy-Tach 325. Honestly, I'm not sure there is enough space to get this clamp-on tach over the spark plug wire of my XT250. What are you using?
Does anyone have any other suggestions about special tools needed for servicing a2013 or 2014 XT250?