Forged Piston Kit — Twin Cam 103

CP-Carrillo forged piston kit for Twin Cam 103 Harley-Davidson engines — the same pistons serious engine builders spec for high-output baggers. Forged in the USA from high-strength 2618 aluminum alloy for strength under boost, nitrous and high compression.

Race / competition use: this is an engine performance component. It is not legal for use or installation on pollution-controlled vehicles operated on public highways in California, and it cannot be shipped to California.

FITMENT

• Engine: Twin Cam Touring
• Application years (CP-Carrillo data): 2014–2016

Not sure it fits your bike? Email info@norcalbaggersupply.com — email is the fastest way to reach us — and we'll confirm before you order. You can also call 916-626-9030 (Mon–Fri, 9 AM–5 PM PT).

SPECIFICATIONS

• BHM5064 — Bore 3.875 in, stroke 4.375 in, 10.1:1 compression, dome -1.6 cc, compression height 1.092 in, wrist pin 927-2250-15CP1C, ring set RS1660-3875-0THG
• BHM5065 — Bore 3.875 in, stroke 4.375 in, 10.1:1 compression, dome -1.5 cc, compression height 1.085 in, wrist pin 927-2250-15CP1C, ring set RS1660-3875-0THG
• M5023 — Bore 3.875 in, stroke 4.375 in, 10.25:1 compression, dome 1.4 cc, compression height 1.092 in, wrist pin 927-2500-15CP1C, ring set RS111A-3875-0
• BHM5080 — Bore 3.875 in, stroke 4.375 in, 10.75:1 compression, dome 5.5 cc, compression height 1.085 in, wrist pin 927-2250-15CP1C, ring set RS1660-3875-0THG
• BHM5083 — Bore 3.875 in, stroke 4.375 in, 11.25:1 compression, dome 10.5 cc, compression height 1.085 in, wrist pin 927-2250-15CP1C, ring set RS1660-3875-0THG
• M5024 — Bore 3.88 in, stroke 4.375 in, 10.25:1 compression, dome 1.4 cc, compression height 1.092 in, wrist pin 927-2500-15CP1C, ring set RS111A-3880-0
• M5025 — Bore 3.885 in, stroke 4.375 in, 10.25:1 compression, dome 1.4 cc, compression height 1.092 in, wrist pin 927-2500-15CP1C, ring set RS111A-3885-0
• M5082 — Bore 3.885 in, stroke 4.375 in, 10.75:1 compression, dome 5.5 cc, compression height 1.083 in, wrist pin 927-2500-15CP1C, ring set RS111A-3885-0
• M5085 — Bore 3.885 in, stroke 4.375 in, 11.25:1 compression, dome 10.5 cc, compression height 1.083 in, wrist pin 927-2500-15CP1C, ring set RS111A-3885-0

Kit includes two pistons, ring sets, wrist pins and clips. Made in the USA by CP-Carrillo.

INSTALLATION

Professional installation by a qualified engine builder or machine shop is required. Cylinders must be bored and honed to the finished piston size, and ring end gaps, piston-to-wall clearance and deck height set to CP-Carrillo's specifications for your build. Pistons only — cylinders and gaskets are not included.

QUESTIONS RIDERS ASK

Is this a complete kit?
Yes — each set covers both cylinders: two pistons, ring sets, wrist pins and clips.

What else does my build need?
Plan on a top-end gasket set, bore/hone machine work, and a tune matched to the new compression and displacement. Email us and we'll help you spec the supporting parts.

Can I order a single replacement piston?
Singles exist in CP-Carrillo's line for service work. Email us the part number off your piston and we'll price a single through our dealer account.