§ 02 / Brand
VERTEX
Vertex builds top-end internals. Pistons, rings, pins, clips — everything you need for a bench rebuild in one box. Cast for stockers, forged when you're chasing compression. Tolerances are tight, the ring seal holds, and the crown geometry survives a tuned two-stroke or a high-revving four. Pick your bore, check the spec, order the kit. Get the motor back together and ride.
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Refine your fitment →VERTEX — frequently asked questions
Common questions, straight answers. No fluff.
- Yes. A, B, and C grades step up in fractions of a millimetre to match the wear in your cylinder. Measure the bore with a proper bore gauge at the top, middle, and bottom before you order. A C piston dropped into a fresh A bore will pick up and seize inside an hour. An A piston in a tired bore rattles, leaks compression past the rings, and chews the skirt before the next oil change. Get the measurement right or send the barrel to a plater first.
- Yes, for riders who service on schedule. The cast crowns hold heat well and the ring packs seat fast on a honed bore.
- Each listing carries the factory part number alongside the Vertex code. Match bore, stroke, compression height, and pin diameter to your engine's spec sheet. If those four numbers line up, the crown profile and ring grooves will sit where the factory put them.
- Strip the top end first. Check the bore for scoring, glazing, or plating breakthrough with a torch and a fingernail. Gauge the bore at six points for taper and ovality. Measure small-end bearing clearance and rock the rod for vertical play, because a tired big-end will kill a new piston in a weekend. Confirm the pin diameter, since some aftermarket cranks run an oversize pin. Note the head gasket thickness and squish band reading too. Order off real numbers, not the previous owner's guesswork.
- Two-stroke pistons are cast. Four-stroke pistons are forged. Cast suits the lower combustion pressures and faster heat cycles of a stroker. Forged handles the detonation loads and rev ceilings of a thumper.
- No. Most kits ship with piston, rings, pin, and circlips only. Order a top-end gasket set separately so you have the base gasket, head O-rings, and exhaust gasket on the bench before the barrel comes off.