In reply, Ronny Kynes notched a brace with Polo Uhi and Cam Regan also touching down. Dan Haymond kicked nine points for the table-toppers.
Bargoed remain the early-season pace-setters turning in another dominant display in a 49-17 victory. Narberth had no answer and shipped seven tries.
Bargoed wing Gareth Dare and Matthew Hutchons both ran over for two tries apiece and forwards Adam Coup, Leigh Meads and James Howe also joined in the try-fest. Josh Prosser was in imperious form with his boot converting all seven tries.
Narberth scored two tries of their own through back-three players John Morgan and James Russell.
Tata Steel triumphed 31-10 away at Beddau and their try-bonus point was secured thanks to tries by Gareth Edwards, Ben Davies and Gareth John. Full-back Gareth Waters kicked 13 points to accompany his try.
Cardiff Met kept pace with Tata in the mid-table tussle, derailing Llanharan 19-5. Glamorgan Wanderers battled to a 15-10 away at Bridgend Athletic
Blackwood won the basement clash beating Pontypool 20-13. The hosts outscored Pontypool by three tries to two as Rhodri Usher, Rhys Watkins and David Ford breached the Pontypool defence.
The away side crossed twice in reply with Ashley Norton and Dave Sandals guaranteeing a losing bonus-point. Newbridge won 16-13 at Bonymaen to consolidate third place.