Fiala FM 85, FM 120, FM 140, FM 170 and FM210 B2 20mm 23cm long Exhaust Extension Twist On
Sold Single
These you slide in place, then twist as hard as you can, then place a 20mm steel clamp
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