Proper chain adjustment is crucial for maintaining performance, preventing excessive wear, and ensuring smooth power delivery. Follow these steps to keep your Cobra CX65 running at its best.

Tools Required:

✔ 22mm wrench or socket
✔ 2 x 11mm open-end wrenches
✔ Clean rag

Step-by-Step Chain Adjustment Guide

🔧 Step 1: Ensure Rear Wheel Alignment

• Before making any adjustments, check that the rear wheel is properly aligned.

🔧 Step 2: Check Chain Free Play

• With no load on the bike, the chain should have 35mm of free movement just behind the chain block. (figure 2)
• CAUTION: Sit on the bike and verify that the chain still has at least 12mm (½”) of free movement at its tightest point.

🔧 Step 3: Loosen the Axle and Adjust the Chain

• Use a 22mm wrench to loosen the rear axle nut.
• Use an 11mm wrench to loosen the jam nuts on the chain adjuster bolts.
• Adjust the chain:
  • Tighten the chain by turning the adjuster bolts clockwise (CW).
  • Loosen the chain by turning the adjuster bolts counterclockwise (CCW).

🔧 Step 4: Secure the Chain Tension

• Place a rag between the chain and rear sprocket and roll the wheel backward—this ensures the adjuster blocks are pulled tightly against the adjuster bolts. (figure 3)

🔧 Step 5: Retighten All Bolts

• Tighten the axle bolt to 34 Nm .
• Retighten the adjuster jam nuts to secure the adjustment.

⚠ CAUTION: Always check and adjust the rear brake free play after adjusting the chain to ensure proper braking performance.