"It's going to niggle for a while yet but I can ride through it. It's not a problem."
Phillips is another rider revelling in the new challenge of a switch to MX1 bikes. He won two of the five races but needed to make a comeback charge through the field in race four.
National champ and defending Summercross title holder Cody Cooper (Papamoa) scored two race wins and finished third as he continues on a comeback from knee surgery in May. "I made some mistakes, which made it hard for me, but I can only blame myself," said Cooper.
"But I improved all day and in the last race I had a good start at last and got a convincing win."
Completing a successful day for the Phillips brothers was Michael Phillips, who claimed the MX2 (250cc) honours.
A few weeks ago, he would have been a Summercross spectator supporting his younger brother.
Then Phillips accepted a Honda Shop Racing offer to stand in for injured Tauranga rider Aaron Wiltshier.
Against a classy MX2 field, Phillips headed off Hamilton's Josiah Natzke (KTM) to take the title by a seven-point margin.
The other MX2 winner was national champ Kayne Lamont (Mangakino) but a nasty spill in the fourth moto saw him helicoptered to hospital with suspected chest and shoulder injuries. Winning the opening moto put Taupo's Wyatt Chase (Yamaha) in front of the three-race Youth MX (15-21 years) class.
He followed up with a second and third, while Ngatea's Benjamin Broad set the pace with two wins. Te Puke's Tyler Steiner (KTM) completed the Youth MX podium.
Auckland's Nikki Scott was a late entry into a record Women's MX field of 36-riders and edged out Tauranga's Jessie Waterhouse (Yamaha) by five points to take the title.
HONDA SUMMERCROSS 2014
MX1 (450cc): 1 Rhys Carter (Mount Maunganui) Suzuki, 246pts; 2 John Phillips (Rotorua) Honda, 244pts. 3 Cody Cooper (Papamoa) Honda, 240pts; 4 Ethan Martens (Auckland) Yamaha, 216pts; 5 Scott Columb (Queenstown) Yamaha, 208pts.
MX2 (250cc): 1 Michael Phillips (Rotorua) Honda, 244pts; 2 Josiah Natzke (Hamilton) KTM, 237pts; 3 Cam Dillon (Taupo) Honda, 229pts; 4 Scotty Canham (Rotorua) Kawasaki, 217pts; 5 Logan Blackburn (Te Puke) Suzuki, 208pts.
Youth MX (125cc and 250cc): 1 Wyatt Chase (Taupo) Yamaha, 151pts; 2 Benjamin Broad (Ngatea) Yamaha, 147pts; 3 Tyler Steiner (Te Puke) KTM, 137pts.
Womens MX: 1 Nikki Scott (Auckland) 160pts; 2 Jessie Waterhouse (Tauranga) Yamaha 155pts; 3 Julie Greenslade (Auckland) Kawasaki, 132pts.
Veterans MX (35-44 years) 1 Daniel Scrimgeour (Taupo) Yamaha, 165pts; 2 Larry Blair (Inglewood) KTM, 139pts; 3 Jonny Edwards (Gisborne) Honda, 130pts.
Veterans MX (45+ years):1 Mitch Rowe (New Plymouth) KTM, 165pts; 2 Bevan Weal (Taupo) Yamaha, 146pts; 3 Geoffrey Hall (Taupo) Yamaha, 139pts.