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Old 07-09-2011, 10:31 PM   #1 (permalink)
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Sprint carbon canister vacuum connection

I was poking around the Sprint GT and noticed a line coming from the carbon canister was not connected to anything. It's the vacuum pipe with the U bend on the end shown in the attachment. The diagram on the bikes air box shows it connects in the area of the middle throttle body. I've pulled off the air box and checked all around but for the life of me I can't find any unused connections anywhere.
Would somebody with a canister equipped bike mind looking letting me know where it goes? This may solve the little off idle stumble I've been having lately.
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Old 07-09-2011, 11:31 PM   #2 (permalink)
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The middle cylinder has 2 connections - the one going to the T-piece is the MAP connection. The other controls the vent valve on the canister via the vacuum pipe.

Look closely at the pic below. The left connection on the middle throttle bore routes between the manifolds and drops down behind the throttle bodies.

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Last edited by champ87; 07-09-2011 at 11:52 PM.
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Old 07-10-2011, 09:34 AM   #3 (permalink)
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Odd. Mine is not like that. As I recall, my 07 Tiger with no canister also had the second port on the middle throttle body capped off. Wonder if the line has ever been connected? I reckon they're all the same but if anybody with a 2011 can take a gander I'd appreciate it.
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Old 07-10-2011, 12:05 PM   #4 (permalink)
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There are 3 hoses on the carbon canister, two hoses are about 3/8" ID. and 1 is about 1/4" dia.
The 1/4" hose(has tip of pencil just behind it) is the one we are talking about.
When the bike is started, a vacuum is applied to the 1/4" hose, which opens the vent valve on the CC.
If this hose is disconnected, you have a vacuum leak somewhere and this surely will cause a off-idle stumble.

Just for info: The upper center- left 3/8" hose goes to the fuel tank tip-over valve. The 3/8" hose to the right wraps around the front of the CC and connects to the purge valve, which is mounted between the cylinder block and the front of the CC.

I would think Champ's '07 is the same as the later Sprints, but you can use "search" for "vacuum line diagram" and look at every post.

Last edited by Bruce C; 01-29-2012 at 11:56 AM.
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Old 07-10-2011, 01:07 PM   #5 (permalink)
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Champ and Bruce,
Thanks both of you guys for responding. I'm assuming my vacuum line was not attached at the factory. I'll remove the plug on the second port by the middle throttle body and connect the vacuum line there.
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Old 11-25-2012, 10:16 PM   #6 (permalink)
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Interesting as I've just noticed today I may have the same issue, the vacuum hose end of the evap canister that looks like it's disconnected. Bike is running just fine, no check engine light, no stumbling. I haven't pulled the tank yet to get a closer look; littlefield did you connect your hose as mentioned above and what was the outcome? P.S. My bike is a U.S. bike (Kentucky)

Tom

Last edited by tomfromON; 11-26-2012 at 09:03 AM.
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