--- product_id: 20448607 title: "50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit Compatible with 1992-up Z50R, 2000+ XR50R and CRF50 [4446]" brand: "50 caliber racing" price: "€ 310.09" currency: EUR in_stock: true reviews_count: 1 url: https://www.desertcart.hr/products/20448607-50-caliber-racing-88cc-stage-1-big-bore-top-end store_origin: HR region: Croatia --- # Lightweight aluminum with steel sleeve 88cc high-performance bore Complete gasket installation kit 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit Compatible with 1992-up Z50R, 2000+ XR50R and CRF50 [4446] **Brand:** 50 caliber racing **Price:** € 310.09 **Availability:** ✅ In Stock ## Summary > 🔥 Upgrade your pit bike, dominate the track! ⚡ ## Quick Answers - **What is this?** 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit Compatible with 1992-up Z50R, 2000+ XR50R and CRF50 [4446] by 50 caliber racing - **How much does it cost?** € 310.09 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/20448607-50-caliber-racing-88cc-stage-1-big-bore-top-end) ## Best For - 50 caliber racing enthusiasts ## Why This Product - Trusted 50 caliber racing brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Power Boosted 88cc Bore:** Unlock serious pit bike performance with a 52mm high-compression piston. - • **Universal Compatibility:** Fits 1992+ Z50R, 2000+ XR50R & CRF50 models—one kit, endless possibilities. - • **Durable Lightweight Design:** Aluminum cylinder with steel sleeve balances strength and weight for peak agility. - • **All-Inclusive Installation Kit:** Everything you need—gaskets, piston, clips—ready for a smooth upgrade. - • **Engineered for Heat Efficiency:** Oversized cooling fins keep your ride cool under pressure. ## Overview The 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit is a precision-engineered upgrade designed for 1992 and newer Z50R, XR50R, and CRF50 pit bikes. Featuring a lightweight aluminum cylinder with a durable steel sleeve, a high-compression 52mm piston, and all necessary gaskets, this kit delivers a noticeable power increase while maintaining reliability and efficient heat dissipation. Ideal for riders seeking a cost-effective performance boost with straightforward installation. ## Description 50 Caliber Racing Stage 1 88cc Big Bore kit (52mm bore) for Z50 (1988-1999), XR and XR50 / CRF 50 (2000-Present) Our 50 Caliber Racing Stage 1 Big Bore Kits are top quality and come with everything you need to finish the job. This is a great way to pump up your Z50, XR50 or CRF50. This kit is recommended for those who don't want to spend a fortune but still want to see a nice power increase over the stock engine. It can be installed by anyone with basic mechanical skills who isn't afraid to turn some nuts and bolts. Includes: - Lightweight aluminum cylinder with steel sleeve - Cast in mounts on cylinder for aftermarket skid plates - Oversized cooling fins on cylinder for efficient heat dissipation - High compression 52mm piston with rings, pin, & clips (can still run pump gas) - Head gasket kit includes all gasket needed to install big bore kit COMPATIBLE WITH: - Z50 (1988-1999) - XR50 (2000-Present) - CRF50 (2000-Present) *High volume oil pump is recommended, not included in this kit ## Features - 88cc Stage 1 Big bore kit - Compatible with 1992-up Z50, XR50 & CRF50 pit bikes - Includes all gaskets needed to install - Lightweight aluminum cylinder with steel sleeve ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | 50 Caliber Racing | | Brand | 50 Caliber Racing | | Item Weight | 3 pounds | | Is Discontinued By Manufacturer | No | | Manufacturer Part Number | 50 Cal Big Bore Kit Stage 1 [4446] | ## Images ![50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit Compatible with 1992-up Z50R, 2000+ XR50R and CRF50 [4446] - Image 1](https://m.media-amazon.com/images/I/71uaMRGlbFL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Five Stars *by C***N on Reviewed in Canada on August 6, 2016* Fast shipping and a good quality parts ## Frequently Bought Together - 50 Caliber Racing 88cc Stage 1 Big Bore Top End Kit Compatible with 1992-up Z50R, 2000+ XR50R and CRF50 [4446] - TTR90 Carburetor with Air Filter and Valve Petcock Replacement for Yamaha TTR90E 2003-2005, TTR90EV 2006, TTR90EW 2007 Carb, 5HN-14101-01-00 5HN-14101-10-00 - uni Two Stage Pod Filter (Straight Mount / 1" X 3) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/20448607-50-caliber-racing-88cc-stage-1-big-bore-top-end](https://www.desertcart.hr/products/20448607-50-caliber-racing-88cc-stage-1-big-bore-top-end) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-24*