Fiala FM 120, FM 140, FM 170 and FM210 B2 25mm Exhaust Extension for 2-in-1 Flextube System
Sold Single, once you lead the two B2 cylinders together using the Y-Piece you can extend the system further by adding this flextube at 25mm, instead of 20mm.
Technical Dimensions
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SETUP GUIDE by DR.G
DR.G's GUIDE TO CARBURETOR BUTTERFLY TRAVEL, THROTTLE SERVO SPEED, ADJUSTING THE CARBURETOR NEEDLES