BMW K1200LT Valve Clearance Adjustment DIY Part 2 of 3

Introduction

This tutorial provides a step-by-step guide to adjusting the valve clearance on a BMW K1200LT motorcycle. Following these instructions will help ensure the engine runs smoothly and efficiently, maintaining optimal performance.

Step 1: Prepare for Adjustment

• Ensure the motorcycle is securely positioned and stable.
• Check that the number one cylinder is at top dead center (TDC):
  • Insert a wooden dowel into the spark plug hole of cylinder one.
  • Rotate the rear wheel in sixth gear until the dowel is fully extended, marking this position.
  • Rotate the wheel until the dowel is fully retracted and mark this position again.
  • Find the halfway point and make another mark; this is approximately 90 degrees before TDC.

Step 2: Block the Chain Tensioner

• Locate the chain tensioner cover screw at the front of the motor.
• Remove this screw and insert a number 30 drill bit to block the tensioner:
  • Push down on the tensioner to allow the drill bit to fit.
• This will create slack in the chain, facilitating easier access to the sprockets.

Step 3: Secure the Timing Chain

• Use zip ties to secure the timing chain to the sprockets:
  • Place at least two zip ties on each sprocket to prevent movement during disassembly.
• Ensure the motorcycle is in neutral to avoid accidental rotation.

Step 4: Remove Sprockets and Camshafts

• Take off the two bolts holding the sprockets in place using a 17mm socket and a 19mm wrench.
• Carefully wiggle the sprockets off while keeping the camshaft stable to prevent it from rotating.
• After removing the sprockets, detach the guide block.

Step 5: Remove Camshaft Caps

• Note the stamped numbers on the bottom of each camshaft cap:
  • Exhaust caps are even-numbered, and intake caps are odd-numbered.
• Remove the caps in order and set them aside to maintain their sequence.

Step 6: Extract the Camshaft

• Loosen the camshaft caps progressively starting from the center to avoid damaging the bearings.
• Gently pull the camshaft out, taking care to prevent any buckets from falling out.

Step 7: Remove and Inspect Bucket Shims

• Use a magnet to carefully extract the bucket shims from each cylinder.
• Document the size of each shim, which is marked on the inside of the cup (e.g., 2.75).

Step 8: Determine Required Shim Sizes

• Measure the current valve clearance:
  • If the clearance is outside the recommended range (0.25 to 0.30 mm), you will need to replace the shims.
• Calculate the new shim sizes needed to achieve the desired clearance, remembering that shims increase in increments of 0.05 mm.
• For example, if a shim is 2.75 mm and needs to be increased for proper clearance, you will need a 2.80 mm shim.

Step 9: Acquire New Shims

• Order new shims to replace those that are out of specification.
• Consider checking online forums for used shims from other enthusiasts if you are looking for more cost-effective options.

Conclusion

Adjusting the valve clearance on a BMW K1200LT involves a detailed process of preparation, disassembly, and precise measurements. By following these steps carefully, you can ensure your motorcycle maintains optimal performance. After acquiring the necessary shims, you can reassemble everything in reverse order, ensuring all parts are returned to their original positions for a successful maintenance job.