Suzuki RM 125 Parts

At AS3 Performance we stock a wide range of aftermarket parts for the Suzuki RM 125, from the late-70s evolution models all the way to the final 2008 production bike. Our range covers braided brake lines, silicone radiator hoses, power valve covers, gasket kits and throttle cables, just a small example of what we offer for the RM 125, all designed and tested for this bike specifically. Whether you're rebuilding a project bike, replacing a part that has come to the end of its life, or upgrading the bike for an edge in classic motocross events, you should find what you need in this category.

Brake Lines

The OEM rubber brake lines on the RM 125 perish with age, and on a 30-plus-year-old bike they have almost certainly hardened, swelled or developed soft spots. A perished line gives a vague, spongy feel at the lever and in the worst case can burst under pressure. Our AS3 Performance by Venhill braided brake lines are manufactured from marine-grade stainless steel braiding over a DuPont PTFE inner core, factory tested to 1500 psi and DOT/TUV approved. The braided construction eliminates expansion, giving a firmer, more consistent feel and a more direct brake action.

We supply both front and rear brake lines for the RM 125 across most of its production history:

• Front Brake Lines — fitments stretching from the introduction of the hydraulic front brake in 1985 to the last year of production in 2008. Available in black and yellow.
• Rear Brake Lines — from 1989 to 2008, some also compatible with the RM 250. Available in black, yellow or red depending on the year.

Each line is fitted with stainless steel swivel unions which help achieve perfect banjo alignment at the caliper and master cylinder, and is supplied with 5 copper washers.

Silicone Hoses

The OEM rubber radiator hoses will have hardened and perished decades ago on most bikes. Our silicone radiator hose kits are manufactured from high-quality 3-ply silicone with polyester reinforcement and a 4.5mm wall thickness, pressure tested to five times the standard working pressure, and far less vulnerable to puncture, perishing or impact damage than rubber. They also restore the look of a well-maintained bike with crisp colour-matched hoses.

We supply silicone hoses for almost all liquid-cooled RM 125 models. A quick overview of the colour options by year:

• RM 125 (1986–1990) — black, blue or yellow
• RM 125 (1991) — black, blue, red or yellow
• RM 125 (1992–1995) — black, blue, red or yellow
• RM 125 (1996–2000) — black, blue, red or yellow
• RM 125 (2001–2008) — black, blue, red, yellow or white

When installing silicone hoses we always recommend using hose clips with smooth inners and edges so as not to damage the hoses. We supply a stainless steel hose clip kit for each of our silicone hoses, with a link to the correct clip kit at the bottom of each product description.

Power Valve Covers

The exhaust power valve on the RM 125 (Suzuki's AETC system) sits on the right side of the cylinder and is exposed to roost and rocks thrown up at the front of the bike. The OEM cover is functional but is cast aluminium and can get damaged or discoloured over time. Our AS3 Performance power valve cover is a billet aluminium replacement that bolts directly in place of the OEM cover, finished in anodised black or yellow with AS3 Performance branding. It fits the 1991–2008 RM 125 and is compatible with the original gasket and mounting bolts.

Gasket Kits

A complete engine gasket kit is essential for any RM 125 rebuild, top-end refresh or major engine work. Our AS3 Engine Gasket Kits include everything needed for a full strip and rebuild, including head gasket, base gasket, cylinder gaskets, clutch cover gaskets and the smaller seals throughout the engine, all manufactured to OEM specifications. We stock kits to cover the most common generations:

• RM 125 (1990)
• RM 125 (1992–1996)
• RM 125 (1998–2000)
• RM 125 (2001–2003)
• RM 125 (2004–2008)

Always check the year on the individual product page to confirm fitment, as Suzuki revised the engine multiple times across the bike's production run and the gasket sets are model-year specific.

Throttle Cables

The OEM throttle cable on the RM 125 will have stretched, kinked or seized in many cases by now, and a sticky throttle on a 125cc two-stroke is the kind of thing that ruins a moto. Our AS3 Performance by Venhill Featherlight throttle cables are direct OEM replacements built to higher tolerances than the factory cables, with a low-friction inner lining for a smoother, lighter throttle action and a longer service life. Available in black or yellow across the full RM 125 production history. Use the year filter on the product page to find the cable that fits your specific bike.

What Parts Offer The Most Protection For The Suzuki RM 125?

Clutch & Ignition Covers — Parts for the RM 125 are becoming harder to obtain as Suzuki discontinue them, and clutch and ignition covers fall into this category. We provide billet aluminium clutch and ignition covers for the RM 125 which are both compatible and much stronger than the OEM parts.

Rear Brake Caliper Guards — The standard rear brake caliper guards on the RM 125 are plastic and can crack, get damaged or become worn over time. Upgrading to one of our billet aluminium guards provides better protection to the braking system and gives the bike a fresh look.

Rotating Bar Clamps — A simple part that can easily save the end of a race or an expensive repair to the front brake area. AS3 Performance rotating bar clamps install on the back of the master cylinder and feature a plastic sleeve that lets the master cylinder rotate on impact in the event of a crash or tip over.

About The Suzuki RM 125

The Suzuki RM 125 was Suzuki's flagship 125cc two-stroke motocross bike from 1975 through to 2008, when Suzuki discontinued the model in favour of the four-stroke RM-Z 250 in the small-displacement classes. Across that 33-year run the bike went through multiple major redesigns and was raced at world championship level by some of the most successful 125cc riders of the era, including Travis Pastrana and Brian Deegan.

The engine is a 124cc liquid-cooled two-stroke single, originally with a piston-port intake and later with a reed-valve intake. From the early 1990s the bike was fitted with Suzuki's AETC exhaust valve system, which varies exhaust port timing with engine speed to broaden the powerband. The bike runs a Mikuni carburettor, a 6-speed gearbox and a multi-disc wet clutch.

The chassis went through several major changes. The 1980s and 1990s bikes used a steel double-cradle frame; from 2001 onwards Suzuki fitted an aluminium twin-spar frame, a major weight reduction and chassis improvement. Front suspension is a Showa or Kayaba telescopic fork depending on year, with a Showa rear shock and rising-rate linkage. Brakes are hydraulic discs front and rear, with Nissin calipers on most years. Wheels are 21-inch front and 19-inch rear.

The RM 125 has had multiple generations of bodywork, graphics and detail changes through its life, and the parts we stock cover most year ranges, with separate fitments per generation where the bike's components changed. Always check the year on the individual product page before purchasing.