Connecting Rod

Rebuild your bottom end with confidence using the PROX Connecting Rod Kit (03.4342). This forged-steel connecting rod is designed for 250cc 4-stroke applications and is supplied as a complete package, helping you restore smooth operation and reliability during an engine rebuild.

If you’re dealing with big-end play, bearing noise, or planning preventative maintenance, replacing the connecting rod assembly is a key step toward protecting your crankshaft and keeping performance consistent. With the necessary bearings and crankpin included, installation is more straightforward and you avoid piecing together mismatched components.

Key features:

• ✅ Complete kit: crankpin, big-end bearing, small-end bearing and washers included
• ✅ Forged steel rod for strength and durability
• ✅ Easy to install during crank/bottom-end service

Benefits of use:

• 🔹 Helps restore reliability and reduce risk of bottom-end failure
• 🔹 Complete kit saves time and simplifies parts selection
• 🔹 Built for demanding riding and rebuild intervals

Technical specifications:

• 📌 Engine type: 4-Stroke
• 📌 Displacement: 250 cc
• 📌 Material: Forged Steel
• 📌 Big end bore: 38.00 mm; big end width: 19.00 mm
• 📌 Length: 129.10 mm; center-to-center length: 92.50 mm
• 📌 Pin end bore: 16.00 mm; pin end bore width: 15.00 mm
• 📌 Shaft length: 65.50 mm

Why choose this product?

• ⭐ PROX quality components trusted for engine rebuilds
• ⭐ Kit format ensures you get the critical matching parts in one box
• ⭐ Great choice for planned maintenance or repair after wear-related symptoms