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Factory TR750 Suzukis from 1972-76 including some specials
SUZUKITR750
ENGINE
Type Two-stroke, piston-port, triple
Bore and stroke 70mm x 64mm
Piston displacement 738cc
Compression ratio 6.76:1 (variable)
Lubrication .Fuel/oil premix, 20:1 (Shell Super M)
Ignition.... Suzuki P.E.I. (Pointless Electronic Ignition)
Spark Plugs..Champion N57G or N82G
Port Timings:
Intake........ opens/closes 90 degrees -below top dead center, 180 degrees duration
Transfers.... open/close 112 degrees below top dead center, 136 degrees duration Exhaust .:.. opens/closes 80 degrees below top dead center, 200 degrees duration Carburetion. 3x Mikuni VM38SC
Jetting:
Main jet . 280 to 330
Needle jet :. R-2
Jet needle 6DP5-2
Pilot jet ... 45
Air jet... none
Slide cutaway .... 2·0
Idle air screw . 1% turns out
Bhp @ rpm....112-115 @ 8200 (estimated)
DRIVE TRAIN Primary .... Straight-cut spur gears
Clutch ... Multi-PPate, dry
Transmission...... Six-speed. constant-mesh
Internal ratios (overall, with 17/41 Ontario sprockets) (1) 2.19:1 (8.30:1) (2) 1.63:1 (6.19:1) (3) 1.33:1(5.06:1) (4) 1.15:1 (4.38:1) (5) 1.04:1 (3.94:1) (6) 0.96:1 (3.65:1)
CHASSIS Wheelbase . 57 in.
Rake/Trail .. 29"/4.17 in.
Frame ... Cradle-type, in chromium-molybdenum steel tubing
Wheels ... Morris cast magnesium, 2.5 x 18 front; 3.5 x 18 rear
Tires ... Dunlop 3.25 x 18 front; 3.50 x 18 rear
Suspension ..... Fork and shocks by Kayaba (per Suzuki specifications)
Brakes ... Dual-piston calipers, twin-disc front; single-disc rear
WEIGHTS & CAPACITIES
Weight, dry .....328lbs...
Oil capacity (trans.) 2.7qts