How To Install a Clutch Kit on a 1999 Honda Z50 Dirt Bike

How To Install a Clutch Kit on a 1999 Honda Z50

Overview Why Replace the Clutch on a 1999 Honda Z50

The 1999 Honda Z50 is a 49cc mini trail bike with an automatic centrifugal wet multiplate clutch. Over time riders notice slipping under load, dragging at low RPM, inconsistent engagement, a harsh or mushy feel when rolling on the throttle, or loss of lowend drive. Because the Z50 is used for tight trail riding, teaching starts, and casual offroad play, clutch wear can be driven by repeated lowspeed slipping and heat. Replacing the clutch kit restores power transfer, crisp throttle response, and smooth acceleration.

Tools & Prep

• Basic metric sockets & ratchet, screwdriver set, pliers
• Rubber mallet, pick or small pry tool, drain pan
• New clutch kit (friction plates, steel plates, springs, any included spacers), replacement gasket for clutch cover
• Fresh motorcycle oil appropriate for small fourstrokes
• Clean rags, parts tray, and a welllit work area

Initial Preparation

Park the Z50 on its center stand or a stable bike lift. Warm the engine slightly, then shut it off to make oil flow easier when you drain. Position a drain pan under the engine and remove the clutch cover bolts. On the 1999 Z50 the clutch sits behind a rightside cover remove any skidplate or chain guard that blocks access. Drain oil only if the clutch cover shares the crankcase oil with this model you will typically lose some oil when removing the cover, so be ready to refill.

Removing the Clutch Assembly

• Remove the clutch cover carefully some oil will run out. Use a clean rag to catch drips and set the cover aside.
• With the cover off you'll see the clutch pressure plate and clutch springs. Because this is a centrifugal system, also note any weights or ramp mechanisms attached to the hub take photos for reassembly orientation.
• Remove the clutch springs and the pressure plate evenly, loosening bolts in a star pattern to avoid binding. Keep springs grouped and note their order.
• Pull out the friction plates and steel drive plates one at a time. For centrifugal designs the inner plates and outer driven plates may differ in appearance follow the order as you remove them so you have a clear sequence for reassembly.
• Remove the clutch hub or basket if your kit or inspection requires this may involve removing a retaining nut or circlip. Keep fasteners in your parts tray.

Inspection What to Look For

Thorough inspection tells whether a full clutch kit is necessary beyond new plates and springs.

• Friction plates check for glazing, excessive thinning, burned spots, or slurry buildup. Light wear is normal; deep grooves or missing friction material warrants replacement.
• Steel drive plates check for blueing or discoloration from heat and try them on a flat surface to detect warping. Mild discoloration is common; sharp heat warps require replacement.
• Clutch basket & hub inspect basket fingers and hub splines for notching or hooked wear. Notching causes poor engagement and can make new plates grab inconsistently.
• Inner hub splines check for burrs and play. Clean any old oil film and debris out of splines with a brush and solvent.
• Thrust washer & pushrod ensure the pushrod is straight and the thrust washer surfaces are smooth. Replace scored or worn washers.
• Springs compare free length and tension feel to new springs. Weak springs give slipping; replace springs with the kit if in doubt.
• Oil condition contaminated or burned oil accelerates wear. Note color and smell if dark and sludgy, plan to change the oil.

Preparing New Plates

Soak new friction plates in fresh engine oil for at least 15-30 minutes before installation so they are fully lubricated. For a wet clutch like the Z50's, this reduces breakin slippage and ensures consistent engagement. Lay steel plates flat and wipe them clean do not heat or oil them excessively beyond the soak on the friction plates.

Reassembly Plates, Springs & Pressure Plate

• Begin reassembly by installing the clutch basket and hub if removed. Ensure the hub splines align and slide smoothly onto the shaft.
• Install plates in the same alternating order you removed them friction plate, steel plate, friction plate, etc. For the Z50 centrifugal clutch, maintain the orientation of any drive tabs or tabs that locate in the basket fingers.
• Seat each plate fully before adding the next. If your kit includes a thicker starter plate or spacer, confirm its position against your photos or the kit instructions.
• Fit the pressure plate and handtighten the spring bolts evenly. Tighten in a crisscross sequence until snug do not overtighten. Replace all springs with new ones if the kit included them.
• Reinstall any centrifugal weights or ramp components exactly as removed. Proper orientation is important for consistent engagement at the expected RPM range.

Final Steps Cover, Oil & Engagement Check

• Clean mating surfaces and install a new clutch cover gasket. Fit the clutch cover and tighten bolts progressively so the gasket seats evenly.
• Refill the engine with the recommended oil type and correct quantity for the Z50. Run the engine briefly to circulate oil through the clutch pack watch for leaks around the cover.
• Because the 1999 Z50 uses an automatic centrifugal clutch, there's no cable to adjust. Instead, verify engagement by revving gently in neutral and blipping the throttle in first gear the clutch should engage smoothly without shuddering or slipping.
• If the bike exhibits dragging or slow engagement after assembly, doublecheck plate order, spring seating, and that the pressure plate bolts are evenly torqued by feel.

RideTest & BreakIn

Start with short, controlled rides avoid aggressive launches for the first 20-30 miles. This breakin period lets new plates mate to the basket and beds in the clutch springs. You should notice restored throttle response, cleaner power transfer, and improved shifting character compared with a worn pack.

Tuning Notes for Z50 Riders

On the 1999 Honda Z50, clutch wear often appears sooner when riders practice aggressive lowspeed maneuvers, frequent slipping in tight woods, or when old oil has been used. Using a clean, appropriate oil and avoiding repeated clutch slipping during starts will lengthen clutch life.

Wrapup

Replacing the clutch kit on your 1999 Honda Z50 is a practical job for a rider with basic mechanical skills. With the right parts, attentive inspection of the basket, hub and plates, and careful reassembly, you'll restore crisp engagement and dependable lowspeed performance that suits the Z50's trail and youth riding role.

Related Shopping Categories

Shop Clutch Kits for a 1999 HONDA Z50 Dirt Bike.

Shop Clutch Baskets for a 1999 HONDA Z50 Dirt Bike.

Shop Clutch Springs for a 1999 HONDA Z50 Dirt Bike.

Shop Inner Hubs and Pressure Plates for a 1999 HONDA Z50 Dirt Bike.

Shop Clutch Covers for a 1999 HONDA Z50 Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.