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Difference between revisions of "BMW R27"
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==Specifications== | |||
Bore (mm): 68 | *Bore (mm): 68<br> | ||
Stroke: (mm): 68 | *Stroke: (mm): 68<br> | ||
Number of cylinders: 1 | *Number of cylinders: 1<br> | ||
Plug gap (inches): 0.024 (0.6mm) | *Plug gap (inches): 0.024 (0.6mm)<br> | ||
Point gap (inches): 0.016 (0.4mm) | *Point gap (inches): 0.016 (0.4mm)<br> | ||
Ignition timing - Advance: Automatic | *Ignition timing - Advance: Automatic<br> | ||
*:degrees BTDC - retarded: 7<br> | |||
*:degrees BTDC - advanced: 40-44<br> | |||
Valve clearance (cold) | *Valve clearance (cold)<br> | ||
*:inlet (inches): 0.006 (0.15mm)<br> | |||
*:exhaust (inches): 0.008 (0.20mm)<br> | |||
Electrical system voltage: 6 | *Electrical system voltage: 6<br> | ||
Battery terminal grounded: Negative | *Battery terminal grounded: Negative<br> | ||
Tire size: 3.25 x 18 | *Tire size: 3.25 x 18<br> | ||
Tire pressure | *Tire pressure<br> | ||
*:front (PSI): 21-22<br> | |||
*:rear (PSI): 22-23 (28-29 when carrying passengers)<br> | |||
Number of gears: 4 | *Number of gears: 4<br> | ||
Approx. weight (Lbs.): 356 | *Approx. weight (Lbs.): 356<br> | ||
==Maintenance== | |||
Recommended spark plugs were: | *Recommended spark plugs were:<br> | ||
*:Bosch type W240T1<br> | |||
*:BERU type 240/14<br> | |||
*:Champion type L-85<br> | |||
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: | *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:<br> | ||
::"OT" for top dead center<br> | |||
::"S" for static timing<br> | |||
::"F" for advanced timing<br> | |||
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. | 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.<br> | ||
[[Category:BMW motorcycles|R27]] | [[Category:BMW motorcycles|R27]] | ||
[[Category:1960s motorcycles|R27]] | [[Category:1960s motorcycles|R27]] | ||