Does any one still make a stop watch that mounts on your handle bars?
Also search for "Sportcount" on ebay - http://shop.ebay.com/i.html?_nkw=sportcount&_sacat=0&_odkw=ring+timer&_osacat=0&_trksid=p3286.c0.m270.l1313
There are some cheaper models out there than the dmc moto trainer.
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I have a sportcount timer. its decent for timing dh runs.. its about 50 bucks i think