drprunty Posted September 26, 2008 Share Posted September 26, 2008 78 XS400. What does the PRI mean on the petcock and what is the purpose? Link to comment Share on other sites More sharing options...
gdarrell Posted September 27, 2008 Share Posted September 27, 2008 78 XS400. What does the PRI mean on the petcock and what is the purpose? It means prime and it will fill the carbs without the vacuum normally required in the "on" position. here is a good explanation: What is a petcock Link to comment Share on other sites More sharing options...
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