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[valliant72]

Hi, just checking the multi rams, the front one works when u rev the engine hard, but the back one doesnt. If u connect a pipe to the diaghram on the back valve it works when vacuum applied, or have i got this back to front and the back one needs a higher revs, revved upto about 5000 rpm.

[The Barge Captain]

With a warm engine, slam the throttle wide open, you should see it move open for a moment.  Needs a lot of intake vacuum for it to work which is difficult to achieve with the engine off load, but do-able.