The first event, called the Orange Peel, was fiercely contested in slippery conditions, resulting in a three-way tie for first place between local rider Jarrod Cornick, his cousin Mason Cornick, of Kelmscott, and Wellard rider Mathew Crosbie.
Performing well in the slow race was Joe Venables, while Joshua Scovell was recognised in the minicross.
The event also included the Start and Park, where riders had to race then stop within a small marked box in the wet grass in a bid to master stopping techniques in testing conditions.
The next Minikhana event will again be held at the Pinjar Junior Training and Education Centre on Ziatas Road on Sunday, August 3.
Gates open at 9am with racing from 10am to 3pm.
Cost is $10 including a sausage sizzle.
Participants must bring their bike and safety gear.
Directions to the Ziatas Road centre will be signposted from the corner of Joondalup Drive and Old Yanchep Road.
Register before August 1 at www.motorcyclingwa.org.au.