• 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
  • 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.
  • 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 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.