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Post by sicily150 on Sept 12, 2007 0:33:37 GMT -5
In terms of performance and/or saving space, would it be beneficial to remove the black vacuum canister from the scooter.
This small black canister has 3 hoses running from it, one is a small rubber vacuum hose that runs to the carburetor, another is a medium-sized braided hose that connects all the way in front of the motor by the head and the other one is a medium-sized rubber hose with a black inline piece that resembles a filter and the end of that hose just hangs in a downward position out of the way.
Would there be any adverse affects or good advantages if this contraption were removed?
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Post by sicily150 on Sept 12, 2007 1:00:41 GMT -5
CORRECTION: the small rubber vacuum hose runs to the intake manifold...also nothing on this canister is connected to the fuel tank.
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Post by sicily150 on Sept 12, 2007 1:05:57 GMT -5
another correction, i believe this is a charcoal canister and not a vacuum canister
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Post by earlwb on Sept 12, 2007 5:53:32 GMT -5
That is a PAIR system. It is a air injector system for injecting air into the exhaust to burn any residual unburnt fuel that makes it through the engine. Commonly you see unburnt fuel getting through mostly when you let off the throttle to use the engine to slow you down as you are approaching a stop.
It basically does not affect engine performance with or without it on the scooter. it does not make the engine run leaner or more rich either.
Some PAIR systems on the scooters are better than others. My scooter uses a U shaped metal tube instead of the high temperature braided rubber tube. That tube runs to a reed valve that prevents the hot exhaust gases from back flowing into the system. They then use a vaccuum operated valve to open the air intake through some kind of a simple air filter system. If you use the engine's air filter you don't need a secondary air filter for the PAIR system.
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Post by earlwb on Sept 12, 2007 5:55:24 GMT -5
There is also a small charcoal canister on many scooters as well as a PAIR system. You can very easily have both.
The charcoal canister is usually at the rear of the scooter close to the fuel tank and the PAIR system is close to the front of the engine.
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Post by jspencer on Sept 14, 2007 10:16:17 GMT -5
Sicily150, check again. Charcoal canisters are usually for absorbing gas fumes from the fuel tank, so there should be a hose from the top of the tank to the canister.
What I found on my scooters was that the setup was poorly designed, so when the tank was full, fuel would slosh into the canister and from there into the intake, flooding the engine. There should be a check valve that prevents liquid from going from the tank to the cansiter, but there is not, at least in my installations.
I ended up disconnecting the canister because it would flood the engine whenever I braked hard with a full tank. No fun having the thing die in a busy intersection.
Jon
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Post by earlwb on Sept 14, 2007 13:28:43 GMT -5
My scooter actually has a check valve on it for that purpose. But sometimes the check valve gets stuck closed with excess fuel anyway.
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Post by richardhill on Sept 27, 2010 12:26:39 GMT -5
I want to replace the big canister airfilter on my 150cc scooter with a performance filter. I am going to ru PVC pipe to the side and forward to attach my new filter. What do I do about the hoses attached to the canister filter? The canister has way too many screrws that are hard to get to.
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Post by sprocket on Sept 27, 2010 12:30:02 GMT -5
I took the system off my Lifan and I saw no change in performance.. it idles better however...
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