Larger tubes are just ran down behind seat post to keep junk out of carb.I know if you hook those 2 together bike wo'nt run at all.The smaller tube from bottom of carb to top is still hooked up.Just had to get one that did'nt crimp.That's against all posts Ive read about this carb,but it's working great on this engine.So I'm definitely no expert on this carb,just know it works for me.The clutch cover is chrome as well as the rest of the covers.