Honda - NT 650 J Bros MkI (RC31) 88

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Bike Info

CC:
650
Bike Description:
Made for Japanese market only. Known for its ability to withstand courier abuse. Low seat height. Narrow width which is good for cutting through traffic. Rare single sided swing arm "PRO ARM".
Chassis info:
RC31
NT 650 J Bros MkI (RC31) Parts and accessories

Service

Cooling System (litres):
2 litres total, 1.6 litres after drain.
Engine Oil Grade SAE:
SAE 10W-40
Engine Oil quantity (litres):
10W
Engine Oil quantity with filter (litres):
2.3 liters
Final Drive grade:
0-ring 525 chain with 112 links
Front Fork Oil cc (right leg):
499cc, 133mm air gap
Idle Speed (rpm):
1200 +/- 100 rpm
Spark Plugs Gap (mm):
0.8mm -0.9mm
Tyre Pressure Back Bar / psi:
33 psi, 36 psi for prolonged high speed riding.
Tyre Pressure Front Bar / psi:
33 psi
Valve Clearance Cold - Exhaust:
0.20 +- 0.02 mm
Valve Clearance Cold - Inlet:
0.15 +- 0.02 mm

Brakes

Front:
Disc
Rear:
Disc
Front Disc Size:
320mm
Front-Pistons-per-caliper:
4
Rear Disc Size:
208mm
Rear-Pistons-per-caliper:
1

Dimensions

Dry Weight:
181 Kg
Fuel Capacity:
10 Litres + 2 Litre reserve
Ground Clearance:
0.155mm
Height:
1050mm
Length:
2060mm
Rake:
27 degrees
Reserve Fuel Capacity:
2 litre
Seat Height:
0.778mm
Trail:
111mm
Wheelbase:
1425mm
Width:
0.695mm

Electrics

Voltage:
12v
Ignition:
CDI
Main Fuse:
30A main, 10A x 6, 15A x 1.
Spark Plugs:
Four NGK DPR8EA-9

Engine

Type:
Liquid Cooled SOHC V Twin
Air Filtration:
Paper element
Bore x Stroke:
79mm x 66mm
Carburation:
Two CV carbs
Compression Ratio:
9.4:1
Displacement:
647cc
Lubrication System:
Forced pressure and wet sump
No. of Valves:
6, 2 Inlet 1 Exhaust Per Cylinder
Starting:
Electric starter
Valve Train:
Silent chain
 

Transmission

Chain Number of Links:
112
Final Drive:
O-ring chain
Gearchange Pattern:
1-N-2-3-4-5
Gear Ratio 1st:
14/36
Gear Ratio 2nd:
17/32
Gear Ratio 3rd:
20/30
Gear Ratio 4th:
25/31
Gear Ratio 5th:
27/29
Gear Ratio 6th:
N/A
Sprocket front:
JTF 296-16
Sprocket rear:
JTR 1311-44
Transmission:
5 speed manual

Misc.

Exhaust:
2 into 1 with collector, stubby exhaust can
Frame:
Twing tube diamond, aluminium, with stressed member.
Motorcycle Style:
ROADSTER

Power

Fuel Consumption:
20 Km per litre
Max Power Output:
55 PS or 54 Hp at 7500 rpm
Max Torque:
57 Nm at 6500 rpm
Power/Weight Ratio:
0.2235 KW per Kg
Top Speed:
180 Kph+, probably more

Suspension

Front:
41mm Showa Telescopic Fork, 130mm travel
Rear:
Monoshock on Singlesided Swinging Arm, 120mm axle travel

Tyres

Front:
110/80-H17 Tubeless
Rear:
150/70-ZR17 Tubeless

Wheels

Bearing Front Left:
6004 LU, 20mm x 42mm x 12mm
Bearing Front Right:
6004 LU, 20mm x 42mm x 12mm
Rear:
Two 6908 LU 40mm x 62mm x 12mm, and one needle roller bearing with no inner ring NK50/25 50mm x 62mm x 25mm.