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L18 mt10 carb secondary


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Hey guys I have a 74 710 and as I’m looking under the hood I noticed that the secondary side of the carb never opens, even when I open the throttle full and the engine revs in neutral. I know it is controlled by a vacuum solenoid but should it open when I do this? Or does it need load on the engine? 
I have also noticed that that side of the carb does not look like it ever pulls anything through it. 

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It's hard to simulate a load without driving it. I hold the throttle just over half open (engine off) to release the interlock and then push up on the secondary vacuum rod. If it's free to move then all OK.


The vacuum diaphragm is in the round cone shaped thing with the rod on the end.


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