Economy Cycle
5815 Acton Circle
Suite 102
Granbury, TX 76049-7857
Please use this address for correspondence and returns
Amazing Parts & Tech Support for – RD350, RD400 and RZ350
THE BEST FLAT RATE SHIPPING $15.95/ANY SIZE ORDER
(excludes tires, exhausts, bulky items, chemicals, does not apply to international orders)
Check out our complete line of performance, aftermarket and reproduction parts for Yamaha RD’s & RZ’s. For Yamaha RD350 Parts, Yamaha RD400 Parts, Yamaha RZ350 Parts
On Sale and Featured Items
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Sale!
Economy Cycle Clutch Kit - Great stock replacement clutch for RD400, RZ350 or Banshee. Includes 7 friction plates, 6 steel plates and 6 springs. Springs are 10% over stock lever pull, provides stronger pressure on the plates without being overly stiff and hard on the hand and wrist. This clutch is intended to provide value for stock or slightly modified bikes and should last as long as the OEM clutch under normal street riding conditions. If you have a built up engine, ride aggressively or intend to go racing, see our other high quality heavy duty clutch kits and options. Includes installation instructions.
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Adjustable Universal Steering Damper. Notched incremental 6 position adjustment. Great steering damper for 250cc - 500cc motorcycles. Requires individual mounting varies bike to bike, includes damper bracket with 8mm stud. 8mm stud can be used in the RD's reflector mount on the frame gusset just under the tank.
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Yamaha RD250 RD350 Airbox Lid - Reproduction Part
Part no. 278-14412-01-00 CAP, CLEANER CASE 1, no longer available from Yamaha.
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Crossover Tube (for manifolds with female boost openings for crossover tube or boost bottle) in Black or Silver finish
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RD Chain Guard Damper Kit - Fits all RD's, R5, DS7 & More see complete fitment below
Kit Includes: Rubber Damper, Special Washer, Collar, Screw/washer
See product detail for complete fitment
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Spark Plug Cap - 5K or 0K resistance for 14mm spark plug, with 90 degree Elbow (RD/RZ/R5), NGK Type - Reproduction, sold each. These caps are just right for the RDs and other 2 stroke vintage Japanese twins. Includes waterproof covers. For terminal stud type plugs or plugs with removeable terminal nuts (BR8ES, BR8HS). It is not recommended to use both resistor caps and resistor plugs, use either resistor plugs with non-resistor caps, or non resistor plugs with resistor caps.
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Sale!
Vintage Yamaha T-Shirt - from the 1975 "someday you'll own a Yamaha" advertising campaign. Premium pre-shrunk soft cotton t-shirt. Official licensed Product. Charcoal color, available in Large only, close out item.
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Yamaha RD Shift Shaft Upgrade Kit - Includes: (This is the Original UK made kit, not the Chinese copy)
- New CNC 6082 Billet Housing / PB1 Bronze Bushing
- O-ring Seal Nitrile
- Shift Shaft Seal
- Acetal Shaft Sleeve
- Easy to install, no mods required
Though they have great transmissions, Yamaha 2 stroke twins aren't known as the best shifting bikes, and as they age shifting becomes even worse. The engine case opening for the shift shaft wears away causing the seal to fail, resulting in a constant oil leak, sloppy shifting, difficulty finding neutral, and missed shifts. Replacing the seal is just a temporary fix until it quickly fails again. This kit helps eliminate those issues. Economy Cycle tested for fitment/performance, highly recommended.
You'll notice a difference in shfiting right away as the shaft/lever have much stronger support from the new bushing. The kit helps reduce miss shifts and revving to the moon, as well as making it a bit easier to find neutral. So sure, the kit eliminates the annoying oil leak with double sealing (by the O-ring and shaft seal), but to us as RD performance enthusiasts, this is a performance improvement allowing for precise and quick shifting. Great for street or race applications. Easy to install.
-
We designed these new kits with RD enthusiasts in mind and includes the following specs / features
- Works with the engine in the frame (most dial gauges are too large and won't fit in the RD due to the frame rails sitting just above the heads)
- Metric Gauge - no need to convert from SAE and one less chance to make a mistake when converting
- Increments:
- 10mm stroke 1/100mm graduation
- Big hand sweeps 1 mm
- Smal hand in .10 mm increments
- 10, 12, & 14mm adapters makes this kit suitable for most 2 strokes
- 2 Extensions
-
Ultra Sonic Carburetor Cleaning - Ultra Sonic cleaning is the most effective way to have your carbs cleaned. The carb bodies are immersed in a non-corrosive heated solution and treated with 40KHz sound pressure waves that clean 100% of all inner and outer surfaces and carb passages. This cleaning far exceeds normal carb cleaning with carb cleaner and wires which simply can't remove all the debris and residue as effectively an Ultra Sonic washer can becuase it cleans 100% of all surfaces. An ultrasonic cleaner works by the energy released from the collapse of millions of microscopic cavitations near the dirty surface.
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520 Chain/Sprocket Conversion Kit for RD250/350/400. Each kit includes a steel 520 countershaft sprocket with correct offset, 520 aluminum rear sprocket and a high quality 520 roller chain made in Japan by DID and cut to the correct number of links for your model. We offer this kit for the RD250/350/400 in the most popular street performance configuration. The RD250/350 kit includes a 14T countershaft sprocket and a 39T rear sprocket and chain. The RD400 (76-78) kit includes a 16T counter shaft sprocket and a 39T rear sprocket and chain. The RD400F (1979) kit includes a 15T counter shaft sprocket and a 37T rear sprocket and chain. Note: All 520 rear sprockets come coated with Titan Tough coating which greatly increases the life of the sprocket. This coating is black, similar to black anodizing . This is the standard gearing for the RD250/350/400 with the front sprocket lowered by 1 tooth for acceleration. Note: RD400 sprockets will require shimming. RD400 Shim kit available separately here on the site. Sprockets made in the USA, Chain made in Japan. Choose model and click add to cart.
Note: This kit does not work with a rear 120/80 tire (causes clearance and chain adjustment issues)
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The Cross over tube helps with mid range performance and helps to smooth power delivery, eliminate flat spots, stumble, bucking, etc. Most of the later Euro/Canadian RD400's and the RZ350 had this type of intake set up, but was never available in the USA for the RD's. This kit is a modified verion of the RZ350 intake and requires NO modifications of any kind and is a direct bolt on upgrade for the RD250/350/400 (all years). Rejetting may be required. Kit includes the following:
- OEM Yamaha RZ350 Manifolds x 2 (modified for the RD)
- OEM Yamaha RZ350 Manifold clamps x 2
- OEM Yamaha Banshee Cross over tube (metal) x 1
- OEM Yamaha RZ350 Cross over tube clamps x 2
- OEM Yamaha RZ350 Reed Valve gaskets x 2
- Stainless Steel Socket Head Bolt (Allen)/SS washer x 8
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Replacement RD250/350/400 Carburetors - Mikuni VM Round Slide Series 28mm Carburetors (pair). Original carburetors for the RD250/350/400 are no longer available from Yamaha. However, Mikuni does offer new VM28 round slide carburetors that are very similar in function and appearance to the original RD carbs. They do require re-jetting, a new throttle cable and optional oil injection. We include a 2 line cable for bikes that use premix or a 3 line cable if you choose the oil injection option. The oil injection option includes new oil nozzles. These carbs are only available with left hand idle screw and have individual choke levers (no choke crossover between carbs). We can jet the carbs for a stock RD250, RD350 or RD400 or for your specific application if you have pipes and other modifications that require jetting changes. Please submit a note with your order upon checkout for jetting changes required, if additional information is required we will contact you. Carb sets are built to order, please allow 5-10 days for shipping. You should let us know the year/model of your RD and any modifications, pipes, air filter, porting, etc. Note: The oil injection option is not required for the R5/DS7.
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Replacement Ignition Coil Kit - for Yamaha RD/R5/YDS6/7. Every thing you need to replace your coils, plug caps and ignition coil wires.
Kit Includes the following:
- 2 Replacement Coils, same dimensions as stock coils, same bolt spacing. Easy to mount and install.
- 2 NGK Type 5K Resistor Spark Plug Caps
- 2 Feet of high quality Ignition Coil Wire
Note: These are reproduction high resistance RD350 coils. These can be mounted on the RD400 but is is recommended to bypass the ballast resistor (easy to do) when installing these coils on the RD400. If you need help with this feel free to contact us.
Note: These coils do not work with some later Euro/Canadian based RD's with CDI ignitions.
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Sale!
Replaces the stock generator, points, condenser, coils and regulator found on the RD, R5 and DS7. This system includes a lightweight cnc machined one piece external magnetic rotor and powerful stator, CDI ignition and HT coil pack, regulator, plug wires and caps, misc hardware and installation instructions. (note: all new systems purchased include the updated rotor
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New Stock Rotors/Discs:
Newly manufactured brake rotor/disc for the Yamaha RD250, RD350, RD400, 265mm. Replaces 351-25831-01-00. Same cast iron as stock, same dimensions and specifications as stock rotor.
Used Rotors/Discs - Drilled and Resurfaced:
ECON PERFORMANCE RD rotors (sold each) for the Yamaha RD250, RD350, RD400. We first check the run out/thickness on these rotors to ensure they are not warped and within factory tolerance. The rotors are then completely resurfaced, cleaned, and drilled with a 45x8mm diagonal hole pattern. Sold as pictured - does not include carrier, bolts or tab washers. Note: These are used rotors and may have slight imperfections - but as always with EC - your satisfaction guaranteed. Note: EC offers a $40 credit for your rotor. We will issue the credit as a refund to your order when the rotor is received. Please email customerservice@economycycle.com after you place the order to let us know you intend to send in your rotor for credit. Note those streaks are simply reflections of light, the rotor has a consistent surface finish.
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We source these premium seals from Japan, by ARS, supplier to Yamaha & other OEM's. This is the same kit we sold for years under the Sudco brand. These are essentially the same seals Yamaha sells in their own packaging.
Oil Seal Kit for Yamaha RD400/350/250. Seal kit includes all seals for bottom end (see note below). This kit includes 10 seals. (click on the picture for seal identification & sizes)
- Countershaft Sprocket Seal
- Crankshaft RH
- Crankshaft LH
- Kickstarter Shaft
- Shift Shaft (crankcase)
- Shift Shaft (outer cover)
- Clutch Push Rod
- Oil Pump Shaft
- Shift Fork Rod Plug x 2
Note: The special O-ring crank seal for the drive output gear keyway is not included in this kit but are available separately here O-ring Crank Seal
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Oil Injection Line Clip, 90468-02033-00 OEM Originals $6.99 each or Reproduction Clips - $1.95 each
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Sale!
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 RD400 springs, much more firm for better performance handling. These work great with 10W fork oil, available here on the site. Sold in pairs. Note: This product has additional shipping charges
-
Sale!
Economy Cycle Clutch Kit - Great stock replacement clutch for RD400, RZ350 or Banshee. Includes 7 friction plates, 6 steel plates and 6 springs. Springs are 10% over stock lever pull, provides stronger pressure on the plates without being overly stiff and hard on the hand and wrist. This clutch is intended to provide value for stock or slightly modified bikes and should last as long as the OEM clutch under normal street riding conditions. If you have a built up engine, ride aggressively or intend to go racing, see our other high quality heavy duty clutch kits and options. Includes installation instructions.
-
Adjustable Universal Steering Damper. Notched incremental 6 position adjustment. Great steering damper for 250cc - 500cc motorcycles. Requires individual mounting varies bike to bike, includes damper bracket with 8mm stud. 8mm stud can be used in the RD's reflector mount on the frame gusset just under the tank.
-
Yamaha RD250 RD350 Airbox Lid - Reproduction Part Part no. 278-14412-01-00 CAP, CLEANER CASE 1, no longer available from Yamaha.
-
Crossover Tube (for manifolds with female boost openings for crossover tube or boost bottle) in Black or Silver finish
-
RD Chain Guard Damper Kit - Fits all RD's, R5, DS7 & More see complete fitment below Kit Includes: Rubber Damper, Special Washer, Collar, Screw/washer See product detail for complete fitment
-
Spark Plug Cap - 5K or 0K resistance for 14mm spark plug, with 90 degree Elbow (RD/RZ/R5), NGK Type - Reproduction, sold each. These caps are just right for the RDs and other 2 stroke vintage Japanese twins. Includes waterproof covers. For terminal stud type plugs or plugs with removeable terminal nuts (BR8ES, BR8HS). It is not recommended to use both resistor caps and resistor plugs, use either resistor plugs with non-resistor caps, or non resistor plugs with resistor caps.
-
Sale!
Vintage Yamaha T-Shirt - from the 1975 "someday you'll own a Yamaha" advertising campaign. Premium pre-shrunk soft cotton t-shirt. Official licensed Product. Charcoal color, available in Large only, close out item.
-
Yamaha RD Shift Shaft Upgrade Kit - Includes: (This is the Original UK made kit, not the Chinese copy) - New CNC 6082 Billet Housing / PB1 Bronze Bushing - O-ring Seal Nitrile - Shift Shaft Seal - Acetal Shaft Sleeve - Easy to install, no mods required Though they have great transmissions, Yamaha 2 stroke twins aren't known as the best shifting bikes, and as they age shifting becomes even worse. The engine case opening for the shift shaft wears away causing the seal to fail, resulting in a constant oil leak, sloppy shifting, difficulty finding neutral, and missed shifts. Replacing the seal is just a temporary fix until it quickly fails again. This kit helps eliminate those issues. Economy Cycle tested for fitment/performance, highly recommended. You'll notice a difference in shfiting right away as the shaft/lever have much stronger support from the new bushing. The kit helps reduce miss shifts and revving to the moon, as well as making it a bit easier to find neutral. So sure, the kit eliminates the annoying oil leak with double sealing (by the O-ring and shaft seal), but to us as RD performance enthusiasts, this is a performance improvement allowing for precise and quick shifting. Great for street or race applications. Easy to install.
-
We designed these new kits with RD enthusiasts in mind and includes the following specs / features
- Works with the engine in the frame (most dial gauges are too large and won't fit in the RD due to the frame rails sitting just above the heads)
- Metric Gauge - no need to convert from SAE and one less chance to make a mistake when converting
- Increments:
- 10mm stroke 1/100mm graduation
- Big hand sweeps 1 mm
- Smal hand in .10 mm increments
- 10, 12, & 14mm adapters makes this kit suitable for most 2 strokes
- 2 Extensions
-
Ultra Sonic Carburetor Cleaning - Ultra Sonic cleaning is the most effective way to have your carbs cleaned. The carb bodies are immersed in a non-corrosive heated solution and treated with 40KHz sound pressure waves that clean 100% of all inner and outer surfaces and carb passages. This cleaning far exceeds normal carb cleaning with carb cleaner and wires which simply can't remove all the debris and residue as effectively an Ultra Sonic washer can becuase it cleans 100% of all surfaces. An ultrasonic cleaner works by the energy released from the collapse of millions of microscopic cavitations near the dirty surface.
-
520 Chain/Sprocket Conversion Kit for RD250/350/400. Each kit includes a steel 520 countershaft sprocket with correct offset, 520 aluminum rear sprocket and a high quality 520 roller chain made in Japan by DID and cut to the correct number of links for your model. We offer this kit for the RD250/350/400 in the most popular street performance configuration. The RD250/350 kit includes a 14T countershaft sprocket and a 39T rear sprocket and chain. The RD400 (76-78) kit includes a 16T counter shaft sprocket and a 39T rear sprocket and chain. The RD400F (1979) kit includes a 15T counter shaft sprocket and a 37T rear sprocket and chain. Note: All 520 rear sprockets come coated with Titan Tough coating which greatly increases the life of the sprocket. This coating is black, similar to black anodizing . This is the standard gearing for the RD250/350/400 with the front sprocket lowered by 1 tooth for acceleration. Note: RD400 sprockets will require shimming. RD400 Shim kit available separately here on the site. Sprockets made in the USA, Chain made in Japan. Choose model and click add to cart. Note: This kit does not work with a rear 120/80 tire (causes clearance and chain adjustment issues)
-
The Cross over tube helps with mid range performance and helps to smooth power delivery, eliminate flat spots, stumble, bucking, etc. Most of the later Euro/Canadian RD400's and the RZ350 had this type of intake set up, but was never available in the USA for the RD's. This kit is a modified verion of the RZ350 intake and requires NO modifications of any kind and is a direct bolt on upgrade for the RD250/350/400 (all years). Rejetting may be required. Kit includes the following:
- OEM Yamaha RZ350 Manifolds x 2 (modified for the RD)
- OEM Yamaha RZ350 Manifold clamps x 2
- OEM Yamaha Banshee Cross over tube (metal) x 1
- OEM Yamaha RZ350 Cross over tube clamps x 2
- OEM Yamaha RZ350 Reed Valve gaskets x 2
- Stainless Steel Socket Head Bolt (Allen)/SS washer x 8
-
Replacement RD250/350/400 Carburetors - Mikuni VM Round Slide Series 28mm Carburetors (pair). Original carburetors for the RD250/350/400 are no longer available from Yamaha. However, Mikuni does offer new VM28 round slide carburetors that are very similar in function and appearance to the original RD carbs. They do require re-jetting, a new throttle cable and optional oil injection. We include a 2 line cable for bikes that use premix or a 3 line cable if you choose the oil injection option. The oil injection option includes new oil nozzles. These carbs are only available with left hand idle screw and have individual choke levers (no choke crossover between carbs). We can jet the carbs for a stock RD250, RD350 or RD400 or for your specific application if you have pipes and other modifications that require jetting changes. Please submit a note with your order upon checkout for jetting changes required, if additional information is required we will contact you. Carb sets are built to order, please allow 5-10 days for shipping. You should let us know the year/model of your RD and any modifications, pipes, air filter, porting, etc. Note: The oil injection option is not required for the R5/DS7.
-
Replacement Ignition Coil Kit - for Yamaha RD/R5/YDS6/7. Every thing you need to replace your coils, plug caps and ignition coil wires. Kit Includes the following:
- 2 Replacement Coils, same dimensions as stock coils, same bolt spacing. Easy to mount and install.
- 2 NGK Type 5K Resistor Spark Plug Caps
- 2 Feet of high quality Ignition Coil Wire
-
Sale!
Replaces the stock generator, points, condenser, coils and regulator found on the RD, R5 and DS7. This system includes a lightweight cnc machined one piece external magnetic rotor and powerful stator, CDI ignition and HT coil pack, regulator, plug wires and caps, misc hardware and installation instructions. (note: all new systems purchased include the updated rotor
-
New Stock Rotors/Discs: Newly manufactured brake rotor/disc for the Yamaha RD250, RD350, RD400, 265mm. Replaces 351-25831-01-00. Same cast iron as stock, same dimensions and specifications as stock rotor. Used Rotors/Discs - Drilled and Resurfaced: ECON PERFORMANCE RD rotors (sold each) for the Yamaha RD250, RD350, RD400. We first check the run out/thickness on these rotors to ensure they are not warped and within factory tolerance. The rotors are then completely resurfaced, cleaned, and drilled with a 45x8mm diagonal hole pattern. Sold as pictured - does not include carrier, bolts or tab washers. Note: These are used rotors and may have slight imperfections - but as always with EC - your satisfaction guaranteed. Note: EC offers a $40 credit for your rotor. We will issue the credit as a refund to your order when the rotor is received. Please email customerservice@economycycle.com after you place the order to let us know you intend to send in your rotor for credit. Note those streaks are simply reflections of light, the rotor has a consistent surface finish.
-
We source these premium seals from Japan, by ARS, supplier to Yamaha & other OEM's. This is the same kit we sold for years under the Sudco brand. These are essentially the same seals Yamaha sells in their own packaging. Oil Seal Kit for Yamaha RD400/350/250. Seal kit includes all seals for bottom end (see note below). This kit includes 10 seals. (click on the picture for seal identification & sizes)
- Countershaft Sprocket Seal
- Crankshaft RH
- Crankshaft LH
- Kickstarter Shaft
- Shift Shaft (crankcase)
- Shift Shaft (outer cover)
- Clutch Push Rod
- Oil Pump Shaft
- Shift Fork Rod Plug x 2
-
Oil Injection Line Clip, 90468-02033-00 OEM Originals $6.99 each or Reproduction Clips - $1.95 each
-
Sale!
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 RD400 springs, much more firm for better performance handling. These work great with 10W fork oil, available here on the site. Sold in pairs. Note: This product has additional shipping charges