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Discussion Starter · #1 ·
carb is off a 2000 trx 400ex ---- first timer, walking through the manual. I took off the air cut off valve and it says" apply vacuum to port. the vacuum should be maintained. air should not flow through the valve ports when vacuum is applied and should flow when vacuum is not applied." I checked this by sucking and blowing into the vacuum port, air didn't flow either way. is this part clogged or should it be tested another way? do i soak this plastic part? thanks for your input.:icon_question:
 

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I think you should be able to blow through the two ports that are side by side, so I would say either the valve is stopped up or bad.

I don't know if you can soak that part or not, I don't really know what's inside of it.
 

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Helmet is the man... he will steer you in the right direction
 

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THis is exact words of my manual..........

Air cut-off valve
Remove the following:
- screw
- air cut-off valve

-slow air jet
- O-rings

Apply vacuum to the vacuum port(hose).
The vacuum should maintained.
Air should not flow through the valve ports when the vacuum is applied, and should flow when the vacuum is not applied.

IMO this is what that means. Suck on the hose, you should not be able to suck through it.
 

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Discussion Starter · #5 ·
the way i read it," when the vacuum is not applyed air should pass." does this mean that i should be able to blow through it ? is it clogged? can i soak this plastic part? ... looked up the part the cost is $ 55.00 before shipping. i didn't know if i could speed up the down time.
 

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You should be able to blow through the ports that are side by side, but if you are pulling a vacuum on the other port, you shouldn't be able to blow through the two side by side ports.

It's just a vacuum operated valve. It's normally open, but when you pull a vacuum on the vacuum port, it closes.
 
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