Suspension and Related

  • Progressive Series 14 Magnum Shocks/Springs for Yamaha RD350, RD250, R5. This combination of shocks/springs from Progressive will give your RD or R5 a great set up for street performance, firm but not harsh, with black body and chrome springs. 5 position adjustable pre load. Black body with silver springs. Sold in pairs. Note: These shocks come ready to mount with the springs installed by Economy Cycle 80/120 Progressive rate.
  • All Balls Front Fork Seal Set for Yamaha RD350 (all years) / RD400 (76-78)
  • All Balls Front Fork Seal Set for Yamaha RZ350 (all years) / RD400R (1979). Sample kit pictured, acutal kit may vary by model.
  • Economy Cycle Classic Shocks for RD250/350/400/R5. Good quality adjustable replacement shocks, sold in pairs. Features glossy black body/upper shroud, with dual rate chrome springs for a smooth ride and firm handling. Includes bushings and springs are pre-mounted. Choose model and click add to cart.
  • Grease Fittings (Zerk Type). Available in 5mm or 6mm. (6mm for RD/RZ). Zerk type zinc coated grease fitting for most Japanese motorcycles.
  • NHK Adjustable Steering Damper. Hydraulic type, Notched incremental adjustment. Great steering damper for 250cc - 500cc motorcycles. Requires individual mounting varies bike to bike, does not include any hardware.
  • Parts Unlimited Front Fork Seal Set for Yamaha RD200 All Years
  • Parts Unlimited Front Fork Seal Set for Yamaha RD250/350/400 Note: 1979 RD400F uses FS-011
  • Parts Unlimited Front Fork Seal Set for Yamaha RZ350/RD400F
  • Progressive springs offer a soft initial spring rate for a plush ride while progressively wound design provides increased resistance to bottoming as spring compresses. Improve handling while retaining OEM geometry Made in the U.S.A.! Huge improvement over stock RD springs, more firm for better performance handling. For RD250/350/R5/DS, we recommend these springs to be cut down 1.5". These work great with 10-15W fork oil, available here on the site. Sold in pairs
  • An excellent choice for the RD/R5 with solid high performance suspension at reasonable price. 12 series shocks are gas-charged for superior, fade-free damping and consistent operation. Six stage, automatic damping designed with a special anti-topping function. Double wall shock body construction for piston protection and long life. Shocks have black body with black springs. Sold in pairs as pictured. Note: These shocks come ready to mount with the springs installed by Economy Cycle 70/120 standard spring rate suitable for performance street riding
  • Progressive Series 14 Magnum Shocks/Springs for Yamaha RD400. This combination of shocks/springs from Progressive will give your RD400 a great set up for street performance, firm but not harsh, with black body and chrome springs. 5 position pre load adjuster and springs come mounted on the shocks ready to install. Sold in pairs.
    Note: These shocks come ready to mount with the springs installed by Economy Cycle
    90/130 Progressive rate
  • Race Tech Fork Springs -  RD250/350/R5/DS7 (all) & RD400 (76-78).  Available in .70kg, .75kg and .80kg spring rates. Recommneded spring rates: Rider weight up to 150lbs - .70kg Rider weight 150-200lbs - .75kg Rider weight 200-250 - .80kg A High Performance Spring has a high stiffness to mass ratio. In other words, it is light weight for a particular rate. This requires the finest materials. And, of course, you want the specific rate you’re paying for. Most manufacturers hold rates within +/-5%, this means a spring marked 5.0 kg/mm could be a 4.75 or even 5.25. (A spring marked 5.0 could be the same rate as one marked 5.4!) Race Tech Springs have extremely accurate rates because we 100% test our springs. Chrome silicon, high stiffness to mass ratio, shot peened, heat treated and pre-set (no sacking). These are the finest springs available, period! Note: This part is not elidgeable for discount or promotion.
  • Race Tech Fork Springs -  RD400 Daytona (1979).  Available in .70kg and .75kg spring rates. Recommneded spring rates: Rider weight up to 150lbs - .70kg Rider weight 150-200lbs - .75kg Rider weight 200-250 - .80kg (not available) A High Performance Spring has a high stiffness to mass ratio. In other words, it is light weight for a particular rate. This requires the finest materials. And, of course, you want the specific rate you’re paying for. Most manufacturers hold rates within +/-5%, this means a spring marked 5.0 kg/mm could be a 4.75 or even 5.25. (A spring marked 5.0 could be the same rate as one marked 5.4!) Race Tech Springs have extremely accurate rates because we 100% test our springs. Chrome silicon, high stiffness to mass ratio, shot peened, heat treated and pre-set (no sacking). These are the finest springs available, period! Note: This part is not elidgeable for discount or promotion.
  • Race Tech Gold Valve Fork Emulators for RD250/350/R5/DS7 (all) & RD400 (76-78), sold in pairs.
    Damping rod forks are notorious for being both too harsh yet too easy to bottom. This is the nature of damping rod fixed orifice forks. In the past all that could be done to improve these forks was change spring rate, oil viscosity or damping hole size, until now. Cartridge Emulators make damping rod style forks perform like well-tuned cartridge forks. These tunable valves sit on top of the damping rods and are held in place by the main springs. This makes them both simple to install and completely tunable for all conditions and rider preferences. Track tests have consistently produce lap times that are 1 or more seconds a lap faster while Cruisers and Gold Wing owners rave at the increased control and ride quality. Note: This part is not elidgeable for discount or promotion.
  • Steering Damper Kit for Yamaha RD350, RD400 RD250. Kit includes billet aluminum fork clamp, Shindy race quality damper & hardware for installation. Designed to reduce head shake, lightweight aluminum oval section damper body has both sides finned to aid in cooling, seven notch adjustment for light to heavy damping. Easy installation. Note: This kit requires minor drilling or tapping of the reflector mount under the tank to accept the damper stud. See our Steering Damper Kit 2 for bolt on kit requiring no drilling or modifications. If you have an R5, we recommend Damper Kit 2. Choose model and click add to cart
  • Steering Damper Kit for Yamaha RD350, RD400 RD250. Kit includes billet aluminum frame clamp, billet fork clamp, Shindy race quality damper & hardware for installation. This kit can be installed without any modifications to the bike, simple bolt on, no drilling or tapping of reflector hole. Reversable, can be mounted on right or left side. Designed to reduce head shake, lightweight aluminum oval section damper body has both sides finned to aid in cooling, seven notch adjustment for light to heavy damping. Easy installation. Choose model and click add to cart.
  • Billet Aluminium steering stabilizers with clear finish, come in a variety of sizes for custom applications. All stabilizers have 7 damping adjustments and are completely rebuildable. Designed to reduce head shake/wobble, lightweight race quality, finned body for maximum cooling. Available in Standard, Short, Long and Extra long sizes. Choose length and click add to cart.
  • RD/RZ Steering Damper Fork Tube Clamp. Billet fork tube clamp. Includes 2 stainless M6x1.0 clamp bolts and one M8x1.25 damper mount bolt. Available in fork tube sizes for many front ends: 34,35,36,38,39,41,43,45,50,52,54mm sizes. Note (RD250/350/400 is 34mm/RD400F Daytona is 35mm, RZ350 is 35mm). Choose clamp size and click add to cart.
  • Sale!
    Yamaha RD350/250 RD400 R5 - Billet Fork Caps with Preload Adjusters Fitment: 1976-78 RD400, 1973-75 RD350, 1971-72 R5 (does not fit 1979 RD400 Daytona) Also fits 77-78 DT250/DT400, 73 TX650
    • These replace your stock fork caps. No modification necessary and allow you to tune your suspension with 20mm+ of adjustment
    • Billet Fork Caps - Natural aluminum finish
    • Allows quick and easy preload adjustment without removing caps and adding spacers. A simple turn of the adjuster up/down is all that's needed
    • Includes 2 caps, o-rings, spring discs and instructions
    • Adjusters have graduated lines on the stems for easy reference
    • Sold in Pairs
    The common misconception with pre load adjusters is that they increase spring tension. What they really do is allow you to adjust sag correctly. With all the suspension mods happening with these bikes it's easy to end up with the wrong sag. Even with the correct spring rate for your weight, you can't always get the optimal sag without opening up the forks and adding spacers or cutting springs. These give you about 20mm of adjustment, which when combined with the proper spring rate, will allow you to set sag perfectly and adjust it for your weight and riding style.
  • Yamaha RD250/350/R5/DS6/DS7 Fork Boot, Reproduction, Sold each. 278-23144-50-00
  • Yamaha RD250/350/R5/DS6/DS7 Fork Boots (Dust Seals). Genuine Yamaha Part, sold in pairs
  • Yamaha RD400 1976-78 Fork Boots, Genuine Yamaha Part, Sold in pairs
  • Yamaha RD400 1976-79 Fork Boots, Reproduction, Sold each. These boots work with both 34mm & 35mm forks. Replaces Yamaha part no. 584-23144-50 & 1T3-23144-50
  • Yamaha RD400 Works Forks Springs. Excellent ultra high performance fork springs for the RD400. Dual rate fork spring kit with 3 crossover sets for adjustable levels of performance/rider weight. Sold in pairs.
  • Yamaha RD400F Daytona 1979 Fork Boots, Genuine Yamaha Part, Sold in pairs. Also fits SR500, TZ250F 1979