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'87 VN750 'Black Pearl'
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11 Posts
Discussion Starter #1
Last month I became the proud owner of a '87 Vulcan VN750. I've been going around the bike with my owners manual and while checking my fuel-valve I discovered it has 3 positions, On/Prime/Reserve. According to my owners manual it shoud be On/Off/Reserve
Whats the difference between a fuel-valve with On/Prime/Reserve and one with On/Off/Reserve? On, Off and Reserve are clear, what happens if the valve is on Prime position?
Maybe not much of a question but can't find the answer in my owners manual.
 

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Premium Member
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1,766 Posts
Prime allows fuel to flow while there is no vacuum to the valve. While cranking for example.

Jon
 

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Linkmeister Supreme
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7,960 Posts
I think your `87 is the last model year that had a petcock with the prime position. As Jon mentioned, "prime" allows fuel to flow to the carb bowls, without vacuum, even without the engine cranking over.
 

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'87 VN750 'Black Pearl'
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11 Posts
Discussion Starter #4
Thanks for the quick reply's. The 'top ten list' looks very usefull and I will check my bike according to this list.
 
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