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There was a paper filter with a single layer of foam
Control unit with variable spark advance timing and with 3 trimmers:
1999 Yamaha WR400F
2013 - LT-A400F KingQuad ASi [IRS]
The Barstow fuses vintage moto design with modern styling and technology resulting in a timeless look with next level performance
TWIN TUNER II 08-16 TOURING W/ 73 PIN 2005 Yamaha YZ250F There was a paper filterThe Twin Tuner II has all of the features of the Twin Tuner and also allows retarding of the spark timing up to 10 to help prevent pre ignition knocking. The user interface consists of up down pushbuttons and a bright daylight readable LED display to select and change the fuel trim and spark retard in the RPM and throttle position ranges required by most applications. Not legal for use in California on pollution controlled vehicles Check local laws
