Page -2- Triumph 650 Unit Overhaul Manual
NOTE: Most bolt and nut sizes are Whitworth (B.S.F. interchangeable) except where U.S. sizes are gradually being introduced.
Unit construction engines start with DU101, 1963 models.
|T120||1-19/32" intake valve (E4**03) and 1-7/16" exh. valve (E2904) instead of 1-1/2" inlet (E3310) and 1-11/32 exhaust (E3927)|
|All||Oil release valve changed to blind cap (no oil pressure indicator)|
|All||Crankshaft located by drive side (before DU13375 and after DU24874 crankshaft located by timing side - see applicable parts manuals and CD411)|
|All||Oil bleed holes in connecting rods|
|All||New tappet guide block and push rod tube seals|
Pressure lubricated exhaust tappets, (E6329 std. radius, E5490 "R" radius) metering jet dowel E6800/3 or E6348 in timing cover.
Light flywheel E6327.
Roller drive side main bearing instead of ball bearing.
|T120||Change from E3001/3002 to E4221/E4222 valve springs.|
Change to "R" tappets (1-1/8" radius) E3059R and E6490.
9:1 pistons (CP206) instead of 8:1 (CP200)
|Sports exhaust camshaft E4855 replaced by racing camshaft E5047.|
|All||9:1 pistons - E6868 in place of CP206 or CP200.|
|TR6||1-19/32" intake valve and 1-7/16" exhaust valve instead of 1-1/2" intake and 1-11/32 exhaust.|
Change to "R" tappets (1-1/6" radius) E3059R and E6480.
Sports exhaust camshaft E4855 replaced by racing camshaft E5047.
|DU47006||T120||Change to heavy-duty connecting rods 1.|
Check on all models by measuring across front or back of rod shank at a point 1" below bottom of pin hole - old type measures .550" and new heavy duty type measure .605".
CAUTION: See note on assembly sheet.
|DU48144||All||Change to unified thread transmission (gearbox) mainshaft.|
|DU51771||All||160-degree ignition cam #54419124.|
|DU63043||All||"Timed" lubrication exhaust tappets (3/32" flat) E8801 ("R" radius) and E8895 (Std. radius) - change back to plain timing cover dowel T989.|
|DU63241||All||O-ring under shoulder of tappet guide blocks.|