GOOFIT
Chain Guide Protector for 420 & 428 Chains | Fits CRF, EXC, YZF, Apollo, & BSE Pit Bikes
Chain Guide Protector for 420 & 428 Chains | Fits CRF, EXC, YZF, Apollo, & BSE Pit Bikes
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Product Overview
The Universal Heavy-Duty Chain Guide is your first line of defense against drivetrain failure. Designed to fully wrap around the chain, this protector ensures perfect alignment as the chain feeds onto the rear sprocket. By preventing derailment during aggressive off-road maneuvers or high-speed jumps, it effectively eliminates the risk of the chain "bunching up" and shattering your engine case. Whether you are racing a CRF 250 R or trail riding on a 125cc pit bike, this guide provides essential security for your drive system.
Product Compatibility
| Component Type | Specification |
| Chain Pitch | 420 and 428 |
| Engine Displacement | 50cc, 110cc, 125cc, 140cc, 150cc, 160cc, up to 250cc |
| Bike Models | Honda CRF, KTM EXC, Yamaha YZF, Kawasaki KXF |
| Chinese Brands | Apollo, BSE, Bosuer, Xmotos, SSR, Thumpstar |
| Vehicle Types | Dirt Pit Bikes, Motocross, Off-Road Motorcycles |
Specifications
| Feature | Details |
| Dimensions | 4.33" x 1.38" x 2.76" (110mm x 35mm x 70mm) |
| Mounting Bolt Pitch | 38mm (1.5") center-to-center |
| Material | High-Impact Reinforced Polymer |
| Protection Style | Full-Wrap (Enclosed) |
| Function | Derailment Prevention & Sprocket Alignment |
Key Features
- Anti-Derailment Safety: The enclosed "full-wrap" design keeps the chain securely on track, even when riding through deep ruts, mud, or over large obstacles where chain slack is common.
- Engine Case Protection: Acts as a critical safeguard; by preventing the chain from jumping off the sprocket, it protects the expensive engine crankcase from being cracked or damaged.
- Universal 420/428 Compatibility: Precision engineered to work seamlessly with both standard 420 and heavy-duty 428 pitch chains, making it a versatile upgrade for most small-to-mid displacement dirt bikes.
- Rugged Construction: Manufactured from high-strength materials designed to endure constant chain friction and resist impacts from rocks, roots, and trail debris.
- Standard Fitment: Featuring a universal 38mm screw pitch, this guide is a direct replacement for many factory guards on major pit bike brands like Apollo and BSE.
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Fitment FAQ
Will this part fit my specific model and year?
This replacement part is intended for 420 & 428 Chains. Key physical/spec details from the product data include 125cc, 50cc, 110cc. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos.
What models or situations does this part not fit?
Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Recheck listed specs such as 125cc, 50cc, 110cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.