Suzuki RM125
Liquid-cooled models, 2004—2008

I have tried to tellthe RM 125 model history on this page as I know it. This page is still under construction. I would be grateful of any contributions — sales brochures, magazine ads, magazine articles, pictures, specs, facts, corrections etc. Please scan the material in JPEG format (large enough that all the details are visible) and send them to me. Please tell me the source and the publication date if possible. If you send me pictures of your own bike, please follow these instructions.

Page 1: RM125 model history 1975—1980 Page 2: RM125 model history 1980—2003 Page 3: RM125 model history 2004—2008

Suzuki introduced the RM (RM = Racing Model, TM = Trail Model) series of motocross models in 1975. The range quicly stretched out from 50 to 400cc and became very successful. A few years later the Full Floater swingarm was introduced and water-cooled engines came along in 1981.

2004 Suzuki year code: K4

Suzuki says that the power and torque on mid-high and high revs has been improved for the 2004-year's model. The connecting rod is 8mm (0.3 in) longer (from 102mm to 110mm). Redesigned and lighter flat-top piston, redesigned exhaust ports, new exhaust valves are some of the other improvements to the engine. The frame, suspension and brakeshave all been improved for the K4 model, both front and rear shock absorbers are new, the rear suspension linkage has been redesigned for better progressivity, both front and rear brakes have been improved and the front fork is thicker and the outer fork tube longer than in the previous model. The frame has the same design than before but is made a bit stronger. Some minor improvements on the rear wheel and clutch cabel adjustement. The seat has been redesigned and is made 10mm (0.4 in) lower.

2004 Suzuki RM125, Champion Yellow (YR1)

2004 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 840 mm (33.1 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (191 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Click on the image for larger format.

2004 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 840 mm (33.1 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (191 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Here's even larger picture.

2004 Suzuki RM125K4 specifications Engine: 124.8cc, two-stroke, single cylinder, liquid-cooled, AETC, crankcase reed Bore Stroke: 54.0 x 54.5mm Compression Ratio: 8.9:1/11.7:1 Fuel System: MikuniT TMX38S Lubrication: Premix Ignition: Digital CDI Transmission: 6-speed Final Drive: #520 chain Overall Length: 2145mm (84.4 in.) Overall Width: 840mm (33.1 in.) Overall Height: 1275mm (50.2 in.) Seat Height: 950mm (37.4 in.) Ground Clearance: 350mm (13.8 in.) Wheelbase: 1450mm (57.1 in.) Dry Weight: 87 kg (192 lbs.) Suspension Front: Telescopic, 22 compression & 20 rebound settings, 12.2 inches (310mm) of wheel travel Suspension Rear: Link-type, spring preload fully-adjustable, 4 high-speed, 16 low-speed compression settings, 19 rebound settings, 12.6 inches (320mm) of wheel travel Brakes Front: Single hydraulic disc Brakes Rear: Single hydraulic disc Tires Front: 80/100-21 51M Tires Rear: 110/90-19 57M Fuel Tank Capacity: 8.0 liter (2.1 gal.) Color: Yellow

2005 Suzuki year code: K5

2005 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 830 mm (32.7 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (192 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Click on the image for larger format.

2006 Suzuki year code: K6

2006 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 830 mm (32.7 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (192 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Click on the image for larger format.

2007 Suzuki year code: K7

For 2007, Suzuki updates the RM125 with a gripper seat that is standard and race ready. The graphic scheme is also redesigned; simpler and claimed to be longer lasting.

2007 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 830 mm (32.7 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (192 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Click on the image for larger format.

2007 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 830 mm (32.7 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (192 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Click on the image for larger format.

2007 Suzuki RM125K7 specifications Engine: 124cc, two-stroke, single cylinder, liquid-cooled, AETC, crankcase reed valve Bore Stroke: 54.0 x 54.5mm Compression Ratio: 8.3:1/9.9:1 (Ex valve open/Ex valve close) Fuel System: MikuniT TMX38SS carburetor Lubrication: Fuel/oil premixture of 30:1 Clutch: Wet multi-plate type Ignition: Digital CDI Transmission: 6-speed constant mesh Gear ratios: 3.368 (64/19)              2.071 (29/14)              1.687 (27/16)              1.444 (26/18)              1.200 (24/20)              1.052 (20/19)              0.950 (19/20) Final reduction ratio: 4.250 (51/12) Final Drive: #520 chain Overall Length: 2 145 mm (84.4 in.) Overall Width: 830 mm (32.7 in.) Overall Height: 1 275 mm (50.2 in.) Seat Height: 950 mm (37.4 in.) Ground Clearance: 350 mm (13.8 in.) Wheelbase: 1 450 mm (57.1 in.) Dry Weight: 87 kg (192 lbs.) Front Suspension: Showa telescopic forks, pneumatic/coil spring, oil damped Rear Suspension: Swingarm, link type, Showa piggyback-reservoir shocks Caster: 27.5° Trail: 115 mm (4.53 in.) Brakes Front: Single hydraulic disc Brakes Rear: Single hydraulic disc Tires Front: 80/100-21 51M Tires Rear: 110/90-19 57M Fuel Tank Capacity: 8.0 liter (2.1 gal.) Color: Champion Yellow No.2 (YU1)

2008 Suzuki year code: K8

New graphics. 2008 Suzuki RM125 color: Champion Yellow (YR1)

2008 Suzuki RM125, Champion Yellow (YR1)

2008 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 840 mm (33.1 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (191 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Here's even larger picture.

2008 Suzuki RM 125 Overall Length: 2 145 mm (84.4 in) Overall Width: 840 mm (33.1 in) Overall Height: 1 275 mm (50.2 in) Seat Height: 950 mm (37.2 in) Ground Clearance: 350 mm (13.8 in) Wheelbase: 1 450 mm (57.1 in) Dry Weight: 87 kg (191 lbs) Engine: Liquid-cooled 124.8 cc single cylinder 2-stroke. 41 hp (30.2 kW) @ 11 500 rpm, 30.2 Nm (3.08 kg-m) @ 10 500 rpm Click on the image for larger format.

Page 1: RM125 model history 1975—1980 Page 2: RM125 model history 1980—2003 Page 3: RM125 model history 2004—2008

More: Suzuki RM-RMX series

More: All Suzuki models

Sources: Suzuki Motor Company, Mineola Moto (USA), James Strawn etc.

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