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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-12-2012, 12:50 AM   #1 (permalink)
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Carb hose: Vent to air or cap?

I just got done with a few mods on my carbie Scrambler. One of the things I did was strip off the smog bits. I wasn't sure what to do with one hose, should it vent to air or should I cap it?

Here's the hose, with a very crude red arrow pointing to it. The hose attaches to a hard pipe between the carbs at the upper part of the carb body towards the engine.

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Old 11-12-2012, 12:51 AM   #2 (permalink)
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Read Gary's Evaporative Loss system removal instructions. He has you buy a longer hose and route it down and vent it alongside the tank breather hose.

In sum, it must be vented.
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Old 11-12-2012, 01:06 AM   #3 (permalink)
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Wow! I guessed right!
It is currently vented down to where the carbon canisters used to reside.
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Old 11-12-2012, 01:08 AM   #4 (permalink)
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Good call. That evap system seriously made the bike a pain to work on in certain areas with all those ribbed hoses.
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Old 11-12-2012, 09:32 PM   #5 (permalink)
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I have read in the past where some have found the "long hose vent" can be a problem in strong cross winds. My '03 has no hose at all--the vent is open to the air right at the carbs with a T connection. This has never caused me any problems in very strong winds. My conclusion is that Mr. T corrected a problem that did not exist in later years by adding the hose. Of course the CA models had the hose to go to the canister.

FYI, if the carb bowls are not vented, the carbs will flood BIG time.
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