What do those mikuni carb vent hoses do - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 02-09-2013, 07:31 PM   #1 (permalink)
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What do those mikuni carb vent hoses do

Hey should I restore hose little carb vent hoses to original? What do they do exactly?
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Old 02-09-2013, 09:56 PM   #2 (permalink)
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The vent hoses are to maintain the same air pressure in the float bowls as the outside air pressure to provide consistant fuel flow through the carb. They are routed up to the handlebars to get them out form under the hood where air pressures are greater. If they are left under the hood they could push extra fuel through the carbs giving you a rich condition.

These vents seem to be an item that is commonly overlooked.

Hope this helps.
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Old 02-09-2013, 10:36 PM   #3 (permalink)
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Thank you. There are so many old sleds where they are gone. Mine sort of degraded and fell apart...
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