Note: cbr250rr(rii) – Models are just post 1997 cbr250rr(r) – Models

HRC – None of these models have been officially confirmed by Honda Japan.

CBR250R(J or K) – Rumoured to rev to 24,000rpm. Exhaust consisted

Of just header pipes, only known race was in the late 80’s “Isle of Man TT”. Different to the CBR250R’s raced in the “All Japan Series”.

HONDA – Only known information is unseen Microfiche of engine.

CBR250RR(?) – Rumoured to have the MC16E engine in a MC22

Frame. Was thought to be the next model, but never eventuated.

OTHER – Yet to be confirmed actually exists, as only external pics seen.

CBR250RR(L, N or R) Turbo – Private owner, rumoured to still be

In Japan. Blow-through system instead of EFI. Power expected around the 92BHP at the rear wheel, with modified engine internals.

· Restrictions

Speed Restriction;

CBR250(F) + CBR250R(H+J+K) + CBR250RR(L+N+R): ~180km/h

POSH Moto Firm and M–Parts make Black Boxes

OR

Remove Trigger Disc inside the Speedo

Power Restriction (Deliberate Restrictions made by Honda Corporation

to comply with Japanese Law);

CBR250(F) + CBR250R(H+J+K) + CBR250RR(L+N): None

CBR250RR(R): Inlet Port sizes reduced

Rev–Limit Restriction;

CBR250(F) + CBR250R(H+J+K) + CBR250RR(L+N+R): 18,500rpm

· General

Cylinder numbering (from left to right when sitting on bike): 1 – 2 – 3 – 4

Firing Order: 1 – 2 – 4 – 3

Spark Plugs:

Type: NGK CR9EH–9 or (CR9EHVX–9)

Gap: 0.8 – 0.9 mm

Top Speed: 180km/h (speed limited), unrestricted 200km/h (approx.)

Max Power: (BHP = PS * 0.986) (kW = BHP * 0.7457)

CBR250(F): 45PS at 14,500rpm

CBR250R(H+J+K): 45PS at 15,000rpm

CBR250RR(L+N): 45PS at 15,000rpm

CBR250RR(R): 40PS at 14,500rpm

Max Torque: (Lb/ft = kg/m * 7.233) (Nm = kg/m * 9.804)

CBR250(F): 2.5kg/m at 10,500rpm

CBR250R(H+J+K): 2.6kg/m at 10,500rpm

CBR250RR(L+N): 2.5kg/m at 12,000rpm

CBR250RR(R): 2.4kg/m at 11,500rpm

Carburettor Type: Keihin 4 x CV

Starter: Electric

Clutch: Wet Multi–Plate

Transmission: 6–speed Constant Mesh

Final Drive: Chain

Bore x Stroke: 48.5mm x 33.8mm

Displacement: 249cm³

Tyre Pressure (unless indicated on tyre sidewall);

CBR250(F) + CBR250R(H);

Front: 2.0kg/cm²

Rear: 2.5kg/cm²

CBR250R(J+K) + CBR250RR(L+N+R);

Front: 2.25kg/cm²

Rear: 2.5kg/cm²

Tyres:

CBR250(F+H);

Front: 100/80–17 52H

Rear: 130/70–17 62H

CBR250R(J+K);

Front: 100/80–17 52H

Rear: 140/70–17 66H

CBR250RR(L+N+R);

Front: 110/70R17 54H

Rear: 140/60R17 63H

Front Suspension: Conventional Forks - 37mm Diameter (No Adjustments)

Rear Suspension: Mono Shock (Preload only adjustments)

Front Brake;

CBR250(F)+CBR250R(H):???mm Dual disc,2 piston Hydraulic callipers

CBR250R(J+K):???mm Single disc, 2 piston Hydraulic callipers

CBR250RR(L+N+R): 275mm Dual disc, 2 piston Hydraulic callipers

Rear Brake;

CBR250(F): 141mm Cable Drum Brake

CBR250R(H+J+K) + CBR250RR(L+N+R): 220mm Single disc, 1 piston

Hydraulic calliper

Dimensions: (Length x Width x Height)

CBR250(F): 2000x685x1120

CBR250R(H): 2000x680x1120mm

CBR250R(J+K): 2020x685x1075mm

CBR250RR(L+N+R): 1975x675x1080mm

Wheel Base:

CBR250(F): 1370mm

CBR250R(H): 1365mm

CBR250R(J+K): 1365mm

CBR250RR(L+N+R): 1345mm

Ground Clearance:

CBR250R(F+H): 140mm

CBR250R(J+K): 135mm

CBR250RR(L+N+R): 130mm

Weight (Dry):

CBR250(F): 153kg (77kg – Front, 76kg – Rear)

CBR250R(H): 155kg (78kg – Front, 77kg – Rear)

CBR250R(J+K): 154kg (77kg – Front, 77kg – Rear)

CBR250RR(L+N): 157kg (80kg – Front, 77kg – Rear)

CBR250RR(R): 158kg (81kg – Front, 77kg – Rear)

· Engine (Liq.–cooled,4–stroke,16–valve DOHC,inline 4 Cyl.)

Engine Oil Type: API grade SE, SF or SG motorcycle oil

Engine Oil Viscosity: SAE10W–40 or SAE20W–50

Oil Capacity:

Oil change: 2.2 litres

Oil and Filter change: 2.4 litres

Engine overhaul with new filter: 2.7 litres

Oil Pressure: 4.0 – 5.0kg/cm² at 6,000rpm, oil at 60^oC

Inlet Valve (1mm Lift);

Opens (Before Top Dead Centre);

CBR250(F): 10˚ BTDC

CBR250R(H): 18˚ BTDC

CBR250R(J+K) + CBR250RR(L+N): 19˚ BTDC

CBR250RR(R): 20˚ BTDC

Closes (After Bottom Dead Centre);

CBR250(F): 40˚ ABDC

CBR250R(H): 34˚ ABDC

CBR250R(J+K) + CBR250RR(L+N): 33˚ ABDC

CBR250RR(R): 20˚ ABDC

Exhaust Valve (1mm Lift);

Opens (Before Bottom Dead Centre);

CBR250(F): 30˚ BBDC

CBR250R(H+J+K) + CBR250RR(L+N): 36˚ BBDC

CBR250RR(R): 29˚ BBDC

Closes (After Top Dead Centre);

CBR250(F): 10˚ ATDC

CBR250R(H+J+K) + CBR250RR(L+N): 11˚ ATDC

CBR250RR(R): 3˚ ATDC

Cam Lobe Diameter;

CBR250(F) + CBR250R(H):

IN: 29.15mm

Service Limit: 29.00mm

EX: 28.85mm

Service Limit: 28.70mm

CBR250R(J+K):

IN: 29.44 – 29.68mm

Service Limit: 29.41mm

EX: 28.96 – 29.20mm

Service Limit: 28.85mm

CBR250RR(L+N):

IN: 28.94 – 29.18mm

Service Limit: 28.91mm

EX: 28.51 – 28.75mm

Service Limit: 28.48mm

CBR250RR(R):

IN: 28.72 – 28.80mm

Service Limit: 28.69mm

EX: 28.51 – 28.75mm

Service Limit: 28.48mm

Cam Journal Diameter: 19.978 – 19.993mm

Service Limit: 19.970mm

Cam Journal Oil Clearance;

Cylinders 1,2,4: 0.015 – 0.057mm

Service Limit: 0.06mm

Cylinder 3: 0.025 – 0.067mm

Service Limit: 0.07mm

Head INLET;

Stem Diameter:

CBR250(F): 3.970 – 3.995mm

Service limit – 3.965mm

CBR250R(H): 3.478 – 3.492mm

Service limit – 3.473mm

CBR250R(J+K) + CBR250RR(L+N+R): 3.481 – 3.495mm

Service limit – 3.47mm

Guide Bore Diameter:

CBR250(F): 4.000 – 4.012mm

Service limit – 4.065mm

CBR250R(H+J+K) + CBR250RR(L+N+R): 3.500 – 3.512mm

Service limit – 3.565mm

Stem to Guide Clearance:

CBR250(F): 0.005 – 0.042mm

Service limit – 0.1mm

CBR250R(H): 0.008 – 0.034mm

Service limit – 0.092mm

CBR250R(J+K) + CBR250RR(L+N+R): 0.005 – 0.042mm

Service limit – 0.1mm

Seat Width: 0.8mm

Service limit – 1.3mm

Head EXHAUST;

Stem Diameter:

CBR250(F): 3.950 – 3.975mm

Service limit – 3.935mm

CBR250R(H+J+K) + CBR250RR(L+N+R): 3.460 – 3.475mm

Service limit – 3.445mm

Guide Bore Diameter:

CBR250(F): 4.000 – 4.012mm

Service limit – 4.065mm

CBR250R(H+J+K) + CBR250RR(L+N+R): 3.500 – 3.512mm

Service limit – 3.565mm

Stem to Guide Clearance:

CBR250(F): 0.005 – 0.050mm

Service limit – 0.13mm

CBR250R(H): 0.025 – 0.052mm

Service limit – 0.132mm

CBR250R(J+K): 0.005 – 0.050mm

Service limit – 0.13mm

CBR250RR(L+N+R): 0.020 – 0.047mm

Service limit – 0.13mm

Seat Width: 1.0mm

Service limit – 1.5mm

Valve Spring Free Length (IN and EX):

CBR250(F): 37.3mm

Service limit – 36.3mm

CBR250R(H): 38.58mm

Service limit – 37.6mm

CBR250R(J+K): 37.3mm

Service limit – 36.3mm

CBR250RR(L+N+R): 37.65mm

Service limit – 36.65mm

Inlet Port Diameter:

CBR250(F): 28mm???

CBR250R(H): 30mm???

CBR250R(J+K): 32mm???

CBR250RR(L+N): 30mm???

CBR250RR(R): 25mm???

Valve Clearances (COLD Engine, i.e. leave engine overnight)

Inlet valves: 0.16mm ± 0.03mm

Exhaust valves: 0.23mm ± 0.03mm

Cylinder Compression:

CBR250(F) + CBR250R(H+J+K): 11.0 to 1

CBR250RR(L+N+R): 11.5 to 1

Cylinder Head: Warpage (max) – 0.10mm

Bore to Piston Clearance: 0.01mm – 0.04mm

Service Limit – 0.1mm

Clutch;

Friction Plates: 7

Plain Plates (Steelies): 6

Friction Plate Thickness: 2.6mm

Plain Plate Warpage: 0.3mm

Spring Free Height: 33.79mm

Chain;

CBR250(F) + CBR250R(H): 520 Pitch, 108 Links

CBR250R(J+K) + CBR250RR(L+N+R): 428 Pitch, 136 Links

Gear Box;

Primary Reduction Ratio: 2.966

Ratios;

1^st: 2.733 (41/15T)

2^nd: 2.000 (38/19T)

3^rd: 1.590 (35/22T)

4^th: 1.333 (32/24T)

5^th: 1.153 (30/26T)

6^th: 1.035 (29/28T)

Final Reduction Ratio;

CBR250(F): 2.500 (35/14T) – 520 Pitch

CBR250R(H): 3.142 (44/14T) – 520 Pitch

CBR250R(J+K): 3.176 (54/17T) – 428 Pitch

CBR250RR(L+N+R): 3.058 (52/17T) – 428 Pitch

· Cooling System

Coolant Capacity:

CBR250(F+H): 1300cc (1100cc – Radiator, 200cc – Engine)

CBR250R(J+K): 1500cc (1300cc – Radiator, 200cc – Engine)

CBR250RR(L+N+R): 1570cc (1350cc – Radiator, 220cc – Engine)

Coolant: 50% Distilled Water and 50% Pure Coolant (containing corrosion