The Bonnie Ref
Triumph 650 O-ring Chart
Size & dash number chart of o-rings
Used on late-sixties & early-seventies Triumph 650 motorcycles
Big throttle blip out to BF!
| 650 Triumph O-Ring Size Chart | Nominal Reference | Actual Inches | Actual MM | ||||||||
| Description | Triumph p/n | Dash # | CS | ID | OD | CS | ID | OD | CS | ID | OD |
| Rocker spindle (updated) | 60-3548 | 1.30 | 12.00 | 14.60 | |||||||
| Rocker spindle | 70-3253 | -11 | 1/16 | 5/16 | 7/16 | 0.070 | 0.301 | 0.441 | 1.78 | 7.65 | 11.21 |
| Tach driven gear housing & Gearshift quadrant | 70-3309 | -15 | 1/16 | 9/16 | 11/16 | 0.070 | 0.551 | 0.691 | 1.78 | 14.00 | 17.56 |
| Tach, driven gear | 70-6299 | -11 | 1/16 | 5/16 | 7/16 | 0.070 | 0.301 | 0.441 | 1.78 | 7.65 | 11.21 |
| Tach gear housing end plug | 70-6300 | -17 | 1/16 | 11/16 | 13/16 | 0.070 | 0.676 | 0.816 | 1.78 | 17.17 | 20.73 |
| Tappet guide (block) | 70-7563 | -20 | 1/16 | 7/8 | 1 | 0.070 | 0.864 | 1.004 | 1.78 | 21.95 | 25.51 |
| Pri.chaincase & Gearbox filler/inspection caps (Updated Feb/2021) | 70-8782 | -118 | 3/32 | 7/8 | 1-1/16 | 0.103 | 0.862 | n/a | 2.62 | 21.89 | n/a |
| Carburettor flange, thin (use w insulator 70-2968) | Amal 622/101 | -28 | 1/16 | 1 3/8 | 1 1/2 | 0.070 | 1.364 | 1.504 | 1.78 | 34.65 | 38.21 |
| Carburettor flange, thick | 70-9711 | -126 | 3/32 | 1 3/8 | 1 9/16 | 0.103 | 1.362 | 1.568 | 2.62 | 34.59 | 39.83 |
| Carb mounting (cup & o-ring) | 70-9554 | -202 | 1/8 | 1/4 | 1/2 | 0.139 | 0.234 | 0.512 | 3.53 | 5.94 | 13.00 |
| Carburettor air adjustment screw (Amal 622/082 ) | 99-0520 | -6 | 1/16 | 1/8 | 1/4 | 0.070 | 0.114 | 0.254 | 1.78 | 2.90 | 6.46 |
| Pushrod Tubes, use 71-1283 top/bottom) | 71-1283Viton/70-7310Buna-N | -120 | 3/32 | 1 | 1 3/16 | 0.103 | 0.987 | 1.193 | 2.62 | 25.07 | 30.31 |
| Swinging fork | 82-8090 | -224 | 1/8 | 1 3/4 | 2 | .139 | 1.734 | 2.012 | 3.53 | 44.04 | 51.10 |
| Lower fork leg, dust excluder sleeve nut | 97-2119 | -130 | 3/32 | 1 5/8 | 1 13/16 | 0.103 | 1.612 | 1.818 | 2.62 | 40.94 | 46.18 |
| Valve inspection cap | n/a | -25 | 1/16 | 1 3/16 | 1 5/16 | 0.071 | 1.1761 | 1.316 | 1.7829 | 29.8733 | 33.43 |
| Valve stem seal | n/a | -10 | 1/16 | 1/4 | 3/8 | 0.070 | 0.239 | 0.379 | 1.78 | 2.90 | 6.46 |
For more information on o-ring materials, see Applerubber.com
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