My S10 did reach 40.000 km.
And I send it to Yamaha for the service.
There was this recall for the front brake contact, they changed it. (I did not have any problems here, but the rear contact did fail (CC not engage) I just clean the rear and all good again)
Valve checked, nothing to adjust (in=0.16 + 0.14 and 0.13 and 0.13 out=0.25 + 0.26 and 0.25 + 0.25)
oli + filter, final drive oli etc. is of course changed. and all other mentioned in 40.000 km service.
Nothing else to do, and no comment from dealer. 6.000 dkr. (just under 1000$)
A little while ago I suddenly blew both front lightbulb, I had a simple measure thing to put in power outlet on dash, and it was very unstable, and I did see above 15vdc.
Next day when I measured again, and now it was stable on 14.45 vdc. I took a day long ride where I had my professional "multimeter" on, (It can show max.), but still no higher than 14,45.
I contacted Yamaha, and there is still Yamaha warranty on it, so they said bring it to us, and let us look at it.
The result was the same, steady on 14.45, and they told me that the allow up to 14.7 vdc!! (way to high in my opinion!!), so nothing done, and no bill for this, even that they put in new lightbulb.
BUT, I am not satisfied with this, I know that I saw above 15 vdc.
I bought a new "charge ratifier" from them and got 20% discount, but still 2.000 dkr (around 315$), and put it on, and now it always is around 14.2 to 14.3 vdc, much better..
Told my dealer this, but no reaction...so not really happy with Yamaha warranty, specially when it is clear that a new deliver 14.2 vdc and not 14.45.
What does your S10 deliver regarding the voltage?
Other problems....no, not at all
I bought this summer an old Honda NX250 from 1988, and did 2500 km on the Swedish TET track on it. (could easily have done it on the S10, and still have it). I might sell the NX again, it does not have much power)
But.....the new Aprilia Tuareg 660 looks nice, with good spec.
, lets see what happens next year. The 660 ccm engine seems to be stable in the 2 other models.