ProX · Clearance
ProX 04-09 CRF250R/04-17 CRF250X Piston Kit 13.5:1 (77.99mm)
MPN 01.1339.C · Store SKU prx01.1339.C
Supplier stock checked 11/7/2026, 9:03:37 AM UTC. Adding a part does not reserve it.
Clearance and scratch-and-dent parts are final sale. No returns or refunds.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
ProX Piston Kits are comprehensive coming complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX also offers oversized piston options in order to follow manufaturer Piston to Cylinder Wall clearances. ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your Motorcycle, Scooter, Moped, ATV, Personal Watercraft, etc.! ProX Piston Kits are complete with: Piston / Ring Kit / Wrist Pin / Cir Clips. ProX pistons are precision machined on the latest, state of the art CNC equipment. ProX uses the same low-expansion, low-friction piston alloy as all major Japanese engine manufacturers. ProX Pstn Kit CRF250R '04-09/CRF250X '04-17 13.5:1 (77.99mm) 77.99 mm, Size: C, 13.5:1
Manufacturer fitment & guides
Check 01.1339.C against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- Emissions acknowledgement required before purchase.
- California Proposition 65: Y
- Clearance item. All sales are final under the supplier clearance policy.
