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They use a vacuum pulse-type pump. It gets that vacuum pulse from a line from one of the cylinders. If that line is cracked or there isn't enough vacuum pulse, it won't pump. Check the line then check the valve lash. If it's too tight it won't have enough vacuum pulse. Also-mist prime the pump. There is two ways. One-turn the tap to PRI and crank it until fuel gets to the carbs, then back to the RUN/ON position or...my way-Two, just pull the fuel line at the carbs and suck it to the end...being careful.
 

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Without enough vacuum pulse, the pump will not work. You can manually test the pump. First, get the fuel to the end of the line first. I suggest manual pulling it from the tank, through the pump and to the end where it attaches..where you are drawing it from but don't hook it back up. Then pull the head-side end of the vacuum line and with your mouth, just pull and release a vacuum as quickly as you can and see if it pumps out the end. Doesn't take much but it will take about 3" of vacuum. If it does, the pump is fine. Hook it all back up and crank it. If it fills the carbs and starts-go ride. If not, check reasons why there is not enough vacuum..like compression, valve settings, any leaks at the head connection...ect. If all else fails you can do what many other have done in the past..install a low pressure (3-5psi) electric pump inline.
 
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