WEIYINGSI Right Brake Master Cylinder for 50–125cc ATVs & Dirt Bikes — 7/8" Handlebar, 10mm Banjo

WEIYINGSI Right-hand brake master cylinder for 7/8" handlebars upgrades front braking on 50–125cc ATVs and dirt bikes.

If you need a direct replacement or an upgrade for the front brake assembly on small off-road bikes, this right-side master cylinder is engineered for reliability under trail conditions. Designed to work with common 50, 70, 90, 110 and 125cc kid's ATVs and pit bikes, it uses a 10mm banjo bolt and fits standard 7/8" handlebars. The construction focuses on durable materials and simple installation so you can get back on the track quickly.

How does this master cylinder improve braking performance?

The unit provides consistent hydraulic pressure through a reinforced pump housing and quality seals, helping you maintain predictable lever feel when stopping. It is built to handle frequent use and thermal stress encountered on rough terrain. Expect steadier braking compared with worn or leaky OEM pumps.

• Heavy-duty pump body resists deformation under pressure
• Nitrile rubber seals maintain integrity against heat and oil exposure
• 10mm banjo bolt fluid port for standard brake line compatibility

Will it fit my bike and handlebar setup?

This master cylinder is tailored for right-hand mounting on 7/8" (22mm) handlebars and fits many small-displacement off-road bikes from 50cc to 125cc. Before ordering, compare the oil-screw and banjo bolt dimensions on your existing pump to ensure correct fitment. Compatibility checks reduce returns and speed up installation.

• Compatible with 50, 70, 90, 110, 125cc kid's ATVs and pit bikes
• Designed for 7/8" (22mm) handlebars standard on many small dirt bikes
• Confirm oil screw and mounting geometry before purchase

How difficult is installation and what’s included?

>The assembly is meant for relatively straightforward replacement of an existing right-hand master cylinder; basic tools and mechanical familiarity are recommended. WEIYINGSI includes a step-by-step instruction manual to guide you through removal, bleed procedure, and reassembly. If you follow the manual, the swap can usually be completed in under an hour.

• Complete master cylinder assembly ready for mounting
• Instruction manual with assembly and bleeding steps
• Standard 10mm banjo bolt connection for brake line attachment

How durable is the master cylinder in trail conditions?

Components were chosen to resist the typical stresses of recreational off-road riding, including vibration, heat spikes, and brief exposure to contaminants. Nitrile seals are selected for longevity and resistance to brake fluid and temperature swings. Regular maintenance and correct brake fluid prevent premature wear.

• Nitrile rubber seals resist heat, oil, and low-temperature cracking
• Robust pump body withstands high hydraulic loads
• Designed for repeated stop-start use common in off-road riding

Who is this for: This right-hand WEIYINGSI master cylinder is intended for riders, parents, and mechanics who maintain small-displacement ATVs or pit bikes and want a dependable front brake pump that swaps into 7/8" handlebars. It's a practical choice for replacing a worn or leaking original part, upgrading an older bike's braking, or stocking quality spare parts for track days and trail rides. Verify your bike's oil-screw and banjo bolt size before ordering to ensure a trouble-free fit.

FAQ

Q: Does this master cylinder fit 7/8" handlebars?

A: Yes. It is designed for right-side mounting on standard 7/8" (22mm) handlebars common to small ATVs and pit bikes.

Q: What size banjo bolt does it use?

A: The unit uses a 10mm banjo bolt for the brake line connection.