Vent Hoses

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Changing the Vent Hoses
Disclaimer Information has been provided on these pages in hope that it will be useful. Each of these pages contains steps followed to complete certain modifications on my bike. This is not a shop manual. I am not a mechanic. I assume no liability for any damages, direct or otherwise, resulting from the use of this information. If you choose to follow the steps on these pages, you do so AT YOUR OWN RISK.					Note: Click on any image to view the full size picture.
As posted by Bobbo on 8/27/2002 in a post entitled "Changing those pesky vacuum lines", it can prove to be a real nuisance when changing vacuum hoses on our Valks. If you remove the air box, you will see that 3 vent hoses are connected to the intake manifolds. 2 of these, which are connected to carbs 3 and 4, are fastened via a T Connector (and another small hose) to the pair valve. You can see the pair valve with the T connector, etc. in the middle of the picture. The idea is to disconnect the hoses from carbs 3 and 4, and to tie a string to each of these. You can see these strings on each side of the picture. Disconnect the hose (in the middle) from the PAIR valve and pull everything upwards. Note: These strings will enable you to pull the new hoses back into the appropriate places.
Notes: The third vent hose, which is used for the petcock valve under the fuel tank, is connected to carb 6. The vents on carbs 1, 2 and 5 are blocked off by rubber vent caps .
String 'em: Side View
String 'em: Top View
Clone the Vent Hoses Measure the hoses, cut new hoses of the same length, and connect these to a T fitting (new or existing one). Untie the strings from the old hoses, and tie them to the end of the new hoses. Carefully pull the strings to snake the new hoses back to carbs 3 and 4. Connect the new hoses to carbs 3 and 4, and to the PAIR valve. Note: Carb 6 is easy to do. Use a string in the same fashion as done above for the pair valve vents.
Clone the Bowl Vent Tubes Also Since the air box was already removed, I decided to also change the small hoses that are connected to the carburators (on the same side as the enrichment valves).
Notes: 5/32 hose and also vent caps were used instead of 3/16 (no clips required) Hats Off to Þrúðr For patiently answering my numerous questions on the subject.