“THESE VINTAGE MOTOCROSS BIKES ARE CURRENTLY SELLING AS A PACKAGE WITH NO RESERVE ON A BRING-A-TRAILER ONLINE AUCTION. THE AUCTION ENDS ON THURSDAY APRIL 30TH @ 2:33PM EST. IF YOU'RE INTERESTED IN PURCHASING PLEASE REGISTER TO BID DIRECTLY WITH BRING-A-TRAILER. IT'S A QUICK AND SIMPLE PROCESS. PLEASE CALL WITH ANY QUESTIONS.”
https://bringatrailer.com/listing/1978-suzuki-rm125c
The “RM” stands for Racing Machine, built for serious off-road competition.
This 1978 Suzuki RM125C and 1978 Suzuki RM400C are in show quality condition and selling as package. In 2014, MS CLASSIC CARS purchased a collection of five vintage motocross bikes which included these two examples. Everything came from the well-known “Greg Primm MX Collection” that was located in Las Vegas, Nevada which closed in 2010. From the information gathered these two examples were completely restored roughly 20 years ago. The show quality restorations utilized both original and aftermarket parts. MS CLASSIC CARS sold the five vintage motocross bikes quickly. These two examples were sold to a collector in Massachusetts and have been on display in a museum for the last 12 years. MS CLASSIC CARS had the opportunity to purchase these two examples back and jumped on the opportunity. MS CLASSIC CARS purchased them in January of 2026 and they've been on display in the showroom. April of 2026 is the first time they've been listed for sale and they're being offered as a package that's selling with NO RESERVE on a Bring-A-Trailer online auction. The two new Factory Effex V.1 Suzuki stands are included.
This 1978 Suzuki RM125C is a beautiful example of a sought after vintage motocross bike. This model is often hailed for its competitive power-to-weight ratio in its era. It's powered by a 123cc two-stroke single-cylinder engine with a 6-speed transmission. This example has the legible frame number #RM125-62327 and engine number #RM125-63399 that both coincide with production timeframe. Everything was restored or replaced during the build. The front wheel is stamped Takasago Japan 1.60x21 and is mounted to a Sedona MV887 80/100-21 tire. The rear wheel is stamped Akront and is mounted to a Maxxis Max X Cross 100/100-18 tire. Both of the wheels show some patina.
This 1978 Suzuki RM400C is a beautiful example of a rare and sought after vintage motocross bike. The RM400 was only produced for three years between 1978 and 1980. It's known for its lightweight design and smooth power delivery in its era. It featured a 402cc two-stroke single-cylinder engine with a 5-speed transmission. It produced an impressive 43hp @ 6500 rpm. This example has the legible frame number #RM400-105051 and engine number #RM400-105069 that both coincide with production timeframe. Everything was restored or replaced during the build. The front wheel is stamped Takasago 1.60x21 and is mounted to a Cheng Shin C-755 3.00/21 tire. The rear wheel is stamped Takasago 18x21.5 and is mounted to a Cheng Shin C-755 5.30/18 tire. Both of the wheels show some patina. The exhaust pipe has a few smalls dents as shown in the gallery.
These two examples were run at the time of completion roughly 20 years ago but haven't been run since. As stated, they've been display pieces. The new owner will be responsible for servicing and tuning if they have the desire to run either machine. A walk-around presentation video is provided in the gallery.
