| Craig Vechorik at Bench Mark Works...saving yesterday's BMW
motorcycles for tomorrow |
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| www.benchmarkworks.com |
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3/3/2005 |
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| Metric/USA
Volume, measurements, torque, etc. for 1955-1969 Earles Fork BMW Motorcycles |
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R26 250cc |
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R27 250cc |
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R50, R50/2 500cc |
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R60, R60/2 600cc |
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R69, R69S 600cc |
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Metric |
USA |
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Metric |
USA |
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Metric |
USA |
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Metric |
USA |
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Metric |
USA |
| ENGINE |
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| Valve, intake |
.15 mm |
.006" |
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.15 mm |
.006" |
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.15 mm |
.006" |
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.15 mm |
.006" |
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.15 mm |
.006" |
| Valve, exhaust |
.20 mm |
.008" |
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.20 mm |
.008" |
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.20 mm |
.008" |
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.20 mm |
.008" |
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.20 mm |
.008" |
| Points gap |
.40 mm |
.016" |
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.40 mm |
.016" |
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.40 mm |
.016" |
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.40 mm |
.016" |
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.40 mm |
.016" |
| Spark plug gap |
.60 mm |
.024" |
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.60 mm |
.024" |
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.60 mm |
.024" |
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.60 mm |
.024" |
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.60 mm |
.024" |
| Bore - Std |
68.0 mm |
2.677" |
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68.0 mm |
2.677" |
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68.0 mm |
2.677" |
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72.0 mm |
2.835" |
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72.0 mm |
2.835" |
| Bore - 1st |
68.5 mm |
2.697" |
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68.5 mm |
2.697" |
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68.5 mm |
2.697" |
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72.5 mm |
2.854" |
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72.5 mm |
2.854" |
| Bore - 2nd |
69.0 mm |
2.716" |
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69.0 mm |
2.716" |
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69.0 mm |
2.716" |
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73.0 mm |
2.874" |
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73.0 mm |
2.874" |
| Bore - 3rd |
69.5 mm |
2.736" |
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69.5 mm |
2.736" |
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69.5 mm |
2.736" |
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73.5 mm |
2.894" |
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73.5 mm |
2.894" |
| Bore - 4th |
70.0 mm |
2.756" |
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70.0 mm |
2.756" |
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70.0 mm |
2.756" |
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74.0 mm |
2.913" |
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74.0 mm |
2.913" |
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| SETUP
CLEARANCE PISTON TO CYLINDER * |
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| For solo use |
.0762 mm |
.0030" |
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.0762 mm |
.0030" |
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.0762 mm |
.0030" |
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.0762 mm |
.0030" |
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.0762 mm |
.0030" |
| For sidecar use |
.0889 mm |
.0035" |
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.0889 mm |
.0035" |
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.0889 mm |
.0035" |
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.0889 mm |
.0035" |
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.0889 mm |
.0035" |
| Max. wear over setup |
.12 mm |
.0048" |
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.12 mm |
.0048" |
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.12 mm |
.0048" |
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.12 mm |
.0048" |
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.12 mm |
.0048" |
| * Only for Kolben Schmidt
pistons |
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| OIL |
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| Engine |
1.25 ltr |
42.3 oz |
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1.25 ltr |
42.3 oz |
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1.9 ltr |
63.9 oz |
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1.9 ltr |
63.9 oz |
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1.9 ltr |
63.9 oz |
| Transmission |
.7 ltr |
23.7 oz |
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.7 ltr |
23.7 oz |
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.8 ltr |
27.0 oz |
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.8 ltr |
27.0 oz |
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.8 ltr |
27.0 oz |
| Swing Arm |
N/A |
N/A |
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N/A |
N/A |
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200 cc |
6.8 oz |
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200 cc |
6.8 oz |
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200 cc |
6.8 oz |
| Final Drive |
125 cc |
4.2 oz |
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125 cc |
4.2 oz |
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150 cc |
5.1 oz |
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150 cc |
5.1 oz |
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150 cc |
5.1 oz |
| Forks (US) Rebuild |
N/A |
N/A |
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N/A |
N/A |
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280 cc |
9.6 oz |
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280 cc |
9.6 oz |
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280 cc |
9.6 oz |
| Forks (US) Refill, max. |
N/A |
N/A |
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N/A |
N/A |
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265 cc |
9.0 oz |
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265 cc |
9.0 oz |
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265 cc |
9.0 oz |
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| TORQUE |
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| Cylinder head bolts |
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24-27fp |
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24-27fp |
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24-27fp |
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24-27fp |
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24-27fp |
| Flywheel bolt |
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123fp |
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123fp |
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160fp |
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160fp |
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160fp |
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| Notes about
lubrication: |
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| Engine: 30 HD
winter, 40 HD summer, or use 20-50HD year round |
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| US,/5/6/7 fork:
use 7.5 fork oil |
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| Gearbox, final
drive, swing arm: |
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| Prior to 1961:
If the bike has original seals, use 40w gear oil |
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| Prior to 1961:
If the bike has new seals (seal replacement), use 90w GL4 gear oil |
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