I treated them well but I would sit on 35 km\hr for 30 minutes then have a 10 min break and do another 30 km.
I notice that the ones I built & sold to old guys who ride really slow (max 28 km\hr) and only go on short trips of 5 kms max have had well over a year of trouble free use and I service their bikes and notice that they all run really sweetly.
The bikes I built for people who expected to travel 30 km runs frequently all gave big trouble and when they saw me go over to 4-stroke they moved over too.
I cannot warranty the HT but I give 12 month warranty on the 4-strokes because I know they don't give any problem.
Another thing, I won't build bikes for rev-heads and idiots and that means a lot of the youngsters don't get one from me.
when I say these motors break very easily I'm talking from experience.
I'll only build HTs for people who want to do small distances and who ride really slowly.