Aprilia 660 balancer half bearing – black grade | 1A0249990N

Aprilia 660 balancer half bearing – black grade | 1A0249990N

The countershaft (balancer) half bearing in black grade is the genuine Aprilia insert used on 660 engines to support the balancer shaft inside the crankcases. It restores proper clearance, reduces friction and helps maintain oil pressure under demanding use.

Why choose it

• Correct clearance: black grade to bring tolerances back to factory spec.
• Reliability: materials and tolerances matched to the 660 power unit.
• Proper service: ideal during rebuilds or balancer support servicing.
• Genuine Aprilia: same quality as original equipment.

Technical details

• Type: balancer shaft half-shell bearing.
• Grade: black (thickness selection).
• Supply: 1 piece (one half). Use two identical grades per support.
• Grade selection: check markings on crankcases and shaft; do not mix grades on the same support.
• Related grades: blue and red variants available in the same family.

Compatibility

• RS 660 2025 (USA 2026)
• Tuono 660 2025 (USA 2026)

Installation tips

1. Clean seats and shaft; inspect for ovality and scoring.
2. Select black grade only if it matches engine markings/measurements.
3. Use assembly lube and torque to spec; verify clearance with a measuring strip before final closing.
4. Always replace the two halves as a pair; do not reuse worn shells.

Package

• 1 × balancer half bearing black grade – code 1A0249990N.