Ah, I see. I dunno about the use of the term 'standard', they are known as 'flag type'. Motocrossers can only use those ones (mainly for roost protection) and enclosed ones are banned, probably as in motard, to stop the argy-bargy that might result from having enclosed hands. They are permitted in enduro and cross-country as the course is not so well groomed and you could be a long way from help (or not allowed any help).
Off-road or on the track? I'll argue the other way'cos even with loose perches (and guards fitted) the DR-Z250 broke plenty of levers in the forest (and the DR200 broke a couple, and the Domi...). I've watched a low-speed tumble where the lever broke because the load was at an angle that wasn't conducive to rotating the perch... and that was what I suspected was the typical loading angle for the many I didn't see in slo-mo. btw not sure if the enclosed BarkBusters are banned from motard (in all markets), as they sell replacable end-scrapers specifically for motard!?
I've had modified levers snap the ball-end off, but never had them fail inboard of the weak spot and never been left in the lurch. Filing the levers costs almost nothing and saves weight! Everyone should do it.
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