CX650 Specifications, Features, History and Regional Variants
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The CX650 was released in 1983, and came in three flavours - the CX650C, C650ED and CX650 Turbo.
Features
The CX650 variants were significant upgrades from most of their 500 brethren. The CX650ED Eurosport shares much with the previous year's CX500EC; notable improvements as compared to other CX500 variants include the tubular frame, dual twin-piston caliper brakes, monoshock rear and a new tank with fuel gauge. The CX650C was a cruiser-oriented bike aimed at the US market, and had it's own frame with a lower seat, teardrop tank and shorter exhaust giving it quite a different look to the other CX650s in 1983's lineup.
The CX650 Turbo was an improvement on the CX500 turbo; changes were made to the compression ratio and boost pressure to make for a less abrupt transition to being on-boost. The fuel injection system was also updated, and the rear monoshock gained a manual damping control mechanism.
CX650 and CX650 Turbo History
The entire CX650 lineup was for a single year only - 1983. Apparently only 1,777 examples of the CX650 Turbo were ever made. We don't have solid numbers on the CX650C and CX650ED.
The 650 variants were the final iterations of the twisted twin - and Honda has not revisited the design since.
Regional Variants
Australia
The CX650C was not sold in Australia, but the CX650ED was. You can find CX650Cs for sale from time to time as imported bikes. There were two Honda motorcycle importers to Australia in '83, each servicing different states (Bennett did NSW and QLD, MPE did VIC, TAS, SA and WA) - one brought in red and white bikes, the other black and white bikes.
Canada
The CX650ED was sold here.
Europe
The CX650E was sold in Europe. Germany had a restricted version available, which had 37kW of power - essentially restricting it to the kW of the CX500.
North America
The CX650C was sold here, but the CX650E was not. The CX650T was sold here!
CX650 Performance
|
CX650ED |
CX650C |
CX650 Turbo |
| Power |
45kW (60hp) @ ? |
45kW (60hp) @ ? |
75kW (100hp) @ 8,000rpm |
CX650 Dimensions
|
CX650ED |
CX650C |
CX650 Turbo |
| Length |
2,250mm (88.6") |
2,180mm (85.8") |
2,220mm (87.4") |
| Width |
760mm (29.9") |
790mm (31.1") |
775mm (30.5") |
| Height |
1,190mm (46.9") |
1,165mm (45.9") |
1,325mm (52.2") |
| Wheelbase |
1,500mm (59.1") |
1,515mm (59.7") |
1,495mm (58.9") |
| Seat Height |
795mm (31.3") |
780mm (30.7") |
790mm (31.1") |
| Foot Peg Height |
|
320mm (12.6") |
? |
| Ground Clearance |
150mm (5.9") |
155mm (6.1") |
145mm (5.7") |
| Dry Weight |
210kg (463lb) |
196kg (432lb) |
235kg (518lb) |
| Wet Weight |
230kg (507lb) |
210kg (463lb) |
256kg (564lb) |
CX650 Frame, Wheels and Tyre Specifications
|
CX650E Eurosport |
CX650C Custom |
CX650 Turbo |
| Type |
Diamond Type |
| Rake |
28 degrees |
32 degrees |
27 degrees |
| Trail |
105mm (4.1") |
126mm (5.0") |
109mm (4.3") |
| Front axle type |
In-line |
Leading |
In-line |
| Front suspension |
Telescopic fork with anti-dive |
Telescopic fork |
Telescopic fork with anti-dive |
| Front fork diameter |
37mm |
39mm |
37mm |
| Front fork oil capacity |
290cc left, 275cc right |
480cc per leg, after disassembly |
310cc per leg, after disassembly |
| Front suspension travel |
150mm (5.9") |
160mm (6.3") |
130mm (5.1") |
| Front suspension air pressure |
0-6psi |
| Rear suspension |
Pro-Link Monoshock, Swingarm |
Dual shocks, swingarm |
Pro-Link Monoshock, Swingarm |
| Rear suspension travel |
110mm (4.3") |
120mm (4.7") |
105mm (4.13") |
| Rear suspension oil capacity |
270cc |
? |
? |
| Rear suspension air capacity |
180cc |
N/A |
260cc |
| Rear suspension air pressure |
0-71psi |
N/A |
28-85psi |
| Front wheel type |
Boomerang Comstar |
Cast alloy |
Boomerang Comstar, silver |
| Front tyre size |
100/90, 18 56 H |
100/90, 19 57 H |
100/90, V18 |
| Front tyre pressure |
32psi, any load |
36psi, any load |
| Rear wheel |
Boomerang Comstar, ?" |
Cast alloy |
Boomerang Comstar, silver |
| Rear tyre |
120/80, 18 62 H |
140/90, 15 70 H |
120/90, V17 |
| Rear tyre pressure |
32psi <90kg load, 40psi >90kg |
36psi <90kg load, 41psi >90kg |
CX650 Brake Specifications
|
CX650E Eurosport |
CX650C Custom |
CX650 Turbo |
| Front Brake Type |
Dual disc, twin piston |
Single disc, twin piston |
Dual disc, ? |
| Front Brake Diameter |
276mm (10.9") |
? |
? |
| Swept Area |
952cm² |
516cm² |
952cm² |
| Rear Brake Type |
Single disc |
Drum |
Single disc |
| Rear Brake Diameter |
276mm (10.9") |
? |
? |
| Swept Area |
476cm² |
201cm² |
476cm² |
CX650 Engine Specifications
|
CX650ED |
CX650C |
CX650 Turbo |
| Type |
4 stroke, OHV, liquid cooled |
| Engine Weight |
74.5kg (164lb) |
78kg (172lb) |
| Bore |
82.5mm (3.25") |
| Stroke |
63mm (2.48") |
| Displacement |
674cc (41.1cu) |
| Compression ratio |
9.8:1 |
7.8:1 |
| Cylinder compression |
171psi |
100-142psi |
| Lubrication system |
Forced pressure, wet sump |
| Oil Capacity |
|
| After draining |
3.0L (3.2 US qt) |
| After disassembly |
3.6L (3.8 US qt) |
| Cooling system |
Electric fan, radiator |
| Cooling system capacity |
|
| After draining |
1.7L (1.8 US qt) |
|
1.5L (1.6 US qt) |
| After disassembly |
2.08L (2.2 US qt) |
2.1L (2.2 US qt) |
| Radiator Cap Release Pressure |
|
10.7-14.8psi |
? |
CX650 Valvetrain Specifications
|
CX650ED |
CX650C |
CX650 Turbo |
| Valvetrain |
Chain driven camshaft + pushrod |
| At 0mm lift: |
|
| Intake valve opens |
|
87°50' BTDC |
84° BTDC |
| Intake valve closes |
|
121°04' ABDC |
108° ABDC |
| Exhaust valve opens |
|
107°26 BBDC |
80° BBDC |
| Exhaust valve closes |
|
82°26 ATDC |
104° ATDC |
| At 1mm lift: |
|
| Intake valve opens |
7° BTDC |
5° BTDC |
| Intake valve closes |
53° ABDC |
30° ABDC |
| Exhaust valve opens |
40° BBDC |
30° BBDC |
| Exhaust valve closes |
15° ATDC |
5° ATDC |
| Intake valve clearance, cold |
0.10mm (0.004") |
| Exhaust valve clearance, cold |
0.12mm (0.005") |
CX650 Fuel System Specifications
|
CX650ED |
CX650C |
CX650 Turbo |
| Fuel Tank Size |
|
12.4L (3.28 US gal) |
20L (5.3 US gal) |
| Fuel Tank Reserve Level |
|
2.2L (0.58 US gal) |
5L (1.3 US gal) |
| Type |
Twin carburetors |
Fuel Injection |
| Carburetor type |
Constant vacuum piston valve |
N/A |
| Carburetor IDs |
VB2BA, VB2BB (G1), VB2BC (G2) |
VB2AC |
N/A |
| Pilot screw initial opening |
2-3/8 |
|
N/A |
| Float level |
15.5mm (0.61") |
N/A |
| Fuel pressure |
N/A |
36.3psi |
| Minimum RON |
|
|
94 RON |
CX650 Drive Train Specifications
|
CX650ED |
CX650C |
CX650 Turbo |
| Clutch |
Wet, multi-plate |
| Transmission |
5-speed, constant mesh |
| Drive Method |
Shaft |
| Primary reduction ratio |
2.114 (74/13) |
1.725 (69/40) |
| 1st gear ratio |
2.5 (40/16) |
| 2nd gear ratio |
1.714 (36/21) |
| 3rd gear ratio |
1.280 (32/25) |
| 4th gear ratio |
1.035 (29/28) |
| 5th gear ratio |
0.838 (26/31) |
| Final drive ratio |
3.090 (34/11) |
3.400 (34/10) |
| Final drive oil capacity |
170cc (5.7 US oz) |
160-180cc (5.4-6.1 US oz) |
|
CX650 Electrical Specifications
|
CX650ED |
CX650C |
CX650 Turbo |
| Ignition type |
Transistorised |
| Ignition timing "F" mark |
15° BTDC @ 1,100rpm |
10° BTDC @ 1,100rpm |
| Full advance |
|
40 +/- 1.5° BTDC @ 3,500rpm |
|
| Starter |
Electric only |
| Alternator |
AC generator, 12V, 252W @ 5000rpm |
AC generator, 12V, 252W @ 5000rpm |
AC generator, 12V, 350W @ 5000rpm |
| Battery capacity |
12V - 14ah |
| Spark Plugs - standard |
NGK DPR8EA-9 |
NGK DPR8EV-9
NGK DPR7EV-9 below 0°C |
| Spark Plugs - extended high speed riding |
NGK DPR9EA-9 |
NGK DPR9EV-9 |
| Spark Plugs - Iridium |
|
|
|
| Spark Plug Gap |
0.8-0.9mm (0.031-0.035") |
| Fuses |
30A main fuse, 15A sub-fuses |
30A main fuse, 15A and 10A sub-fuses |
30A main fuse, 15A sub-fuses, 10A fan motor fuse |
CX650 Light Bulb Specifications
|
CX650ED |
CX650C |
CX650 Turbo |
| Voltage |
All 12V. CP = candlepower # - SAE no. |
| Headlight - high/low |
60/55W |
60/55W (Phillips 12342/99 or equiv.) |
| Tail/brake light |
21/5W, 23/8W (U) |
8/27W, 3/32cp, #1157 |
| Turn signal or indicator, front |
21W, 23W (U) |
32cp, #1034 |
23W, 32cp, #1073 |
| Turn signal or indicator, rear |
21W, 23W (U) |
23W, 32cp, #1073 |
| License plate light |
|
4cp |
? |
| Meter light |
3.4W |
3.4W, 2cp, #158 |
| Neutral indicator |
3.4W |
3.4W, 2cp, #158 |
| Turn signal indicator |
3.4W |
2cp, #158 |
|
| High beam indicator |
3.4W |
3.4W, 2cp, #158 |
| Tail/brake light warning light |
N/A |
2cp |
N/A |
| Oil pressure warning light |
3.4W |
3.4W, 2cp, #158 |
| Fuel system warning light |
N/A |
3.4W, 2cp, #158 |
| Fuel reserve warning light |
? |
N/A |
3.4W, 2cp, #158 |
| Running light |
? |
? |
4W |
