Replace the old plastic-tank radiator in your NA Miata and upgrade the fans at the same time with this aluminum radiator kit from Yonaka. It comes with a dual-core aluminum radiator, aluminum fan shroud and two 12-inch electric fans, so you are not piecing the main parts of the cooling upgrade together separately.
This is a direct-fit radiator for manual-transmission 1990-1997 Miatas with either the 1.6L or 1.8L engine. Yonaka rates it to flow 200% more coolant than the stock Mazda radiator, making it a solid upgrade for a daily-driven Miata, track car or turbo build that needs more cooling capacity.
Fitment Information
- 1990 Mazda Miata NA 1.6L with Manual Transmission
- 1991 Mazda Miata NA 1.6L with Manual Transmission
- 1992 Mazda Miata NA 1.6L with Manual Transmission
- 1993 Mazda Miata NA 1.6L with Manual Transmission
- 1994 Mazda Miata NA 1.8L with Manual Transmission
- 1995 Mazda Miata NA 1.8L with Manual Transmission
- 1996 Mazda Miata NA 1.8L with Manual Transmission
- 1997 Mazda Miata NA 1.8L with Manual Transmission
Fitment Note: This radiator is made for manual-transmission Miatas only. It works with USDM and JDM engines but does not fit automatic-transmission models.
Specs & Features
- Lightweight dual-core aluminum radiator
- Aluminum end tanks
- Polished aluminum core
- Direct replacement for the original Miata radiator
- Includes aluminum fan shroud
- Includes two 12-inch electric cooling fans
- Accepts aftermarket cooling fans
- Includes new radiator cap
- Includes new drain plug
- Rated by Yonaka to flow 200% more coolant than the stock radiator
- Yonaka part number YMAR034
Radiator Dimensions
- Total size: 28 inches long x 18 inches high x 5.5 inches thick
- Core size: 25 inches x 12.5 inches
- Core thickness: 2 inches
- Inlet diameter: 1.25 inches
- Outlet diameter: 1.25 inches
- Drain plug thread: M10 x 1.25
Fan and Shroud Dimensions
- Fan diameter: 12 inches each
- Shroud height: 16 inches
- Shroud length: 25 inches
- Shroud width with fans: 3.5 inches
Installation Notes
The radiator is designed to fit in the factory location, but the cooling fans still need to be wired correctly during installation. This is also a good time to inspect the upper and lower radiator hoses, heater hoses and coolant expansion tank. These cars are close to 30 years old now, and replacing an old hose while the cooling system is already drained can save you from taking it apart again later.
Make sure the cooling system is properly filled and bled before driving the car. Check for leaks once the engine reaches operating temperature and confirm that both fans turn on as intended.
Pairs Well With
- Mishimoto Silicone Radiator Hoses for Miata NA 1.6L (90-93) - Replace the original upper and lower radiator hoses while installing the new radiator. Available in black, blue or red for 1.6L cars.
- HPS Silicone Radiator Hoses for Miata NA 1.8L (94-97) - A direct-fit upper and lower radiator hose kit for 1.8L Miatas. Stainless steel clamps are included.
- Moroso Coolant Expansion Tank for Miata NA (90-97) - Replaces the aging factory coolant tank with an aluminum tank that matches the upgraded Yonaka radiator.
Warranty
Covered by Yonaka's one-year limited warranty.
About Yonaka Motorsports
Yonaka Motorsports has been making performance parts for import cars since 2001. Its lineup includes radiators, exhaust systems, suspension parts and other straightforward upgrades for popular Honda, Mazda and Nissan platforms.
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