BMW R27
- 247cc single cylinder.
1967
- Specifications:
Bore (mm): 68 Stroke: (mm): 68 Number of cylinders: 1 Plug gap (inches): 0.024 (0.6mm) Point gap (inches): 0.016 (0.4mm) Ignition timing - Advance: Automatic
degrees BTDC - retarded: 7 degrees BTDC - advanced: 40-44
Valve clearance (cold)
inlet (inches): 0.006 (0.15mm) exhaust (inches): 0.008 (0.20mm)
Electrical system voltage: 6 Battery terminal grounded: Negative Tire size: 3.25 x 18 Tire pressure
front (PSI): 21-22 rear (PSI): 22-23 (28-29 when carrying passengers)
Number of gears: 4 Approx. weight (Lbs.): 356
- Maintenance:
Recommended spark plugs were:
Bosch type W240T1 BERU type 240/14 Champion type L-85
Timing marks are located on the flywheel. These marks align with a notch in a timing hole which is located in the left side of the flywheel housing. Marks on the flywheel are:
- "OT" for top dead center - "S" for static timing - "F" for advanced timing
Advanced timing is checked with the motor running at 3000RPM. Adjustment is accomplished by moving the entire breaker plate assembly after loosening two screws and sliding the assembly along elongated holes.