| 2 strokes with the on/off power are more draining to ride regarding concentration, whereas 4 strokes are smoother and easier to get on with as a novice offroader, that's what I found out when I went to Wales recently for a weekend training.
Road 250 and 400 KTM's and a couple of 200/250 2 strokes and prefered the 4's.
I was just as quick as my mate on his 250 2 stroke and felt more comfortable. | 
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