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Old 08-21-2010, 06:11 PM   #1
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hi, i have a 2003 kawasaki kfx 400 and on the side where the fuel shutoff switch is there r three words, on, reserve, and primary, does anyone know what primary means?????
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Old 08-22-2010, 12:46 PM   #2
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Prime is just constant fuel flow.
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Old 08-23-2010, 02:23 PM   #3
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then whats on mean?
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Old 08-23-2010, 03:08 PM   #4
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You carberator pulls fuel by vacuum through the motor. The prime index on the petcock is to prime the carb if the bowl is dry form draining it to clean the carb or what not. The on index is for normal running conditions.
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Old 08-24-2010, 06:42 AM   #5
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so you use prime when the carb is dry, but for how long untill you seitch it over to on???
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Old 03-30-2011, 07:40 PM   #6
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Any reply to this question of how long for the prime switch? Thanks
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Old 03-30-2011, 09:22 PM   #7
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I've never used prime.....well not until I changed to an FCR carb.
You don't need it. The 'choke' will also get gas into your carb quicker, not worth reaching down to switch the petcock.
You can use it just as described though......as well as if you run out of gas you could switch it to prime and then to reserve.
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Old 03-31-2011, 08:23 PM   #8
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Thanks man, the quad just runs out of fuel and I've cleaned carb every jet and hole I could find, rebuild carb kit, checked for clogged lines, checked for vacuum leak, its all stock, everything is real clean petcock etc. I think I'm ready to take it in for service.
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Old 04-01-2011, 08:11 AM   #9
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Are you sure the diaphragm doesn't have a tear in it?....although I would think on prime it should be flowing fuel. How about the needle valve is the float working right and letting the valve open and close.
I would switch to a Raptor 660 petcock for 20 bucks or so and try that before taking it to the shop.
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Old 04-06-2011, 10:57 AM   #10
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Sorry i took so long gettin back thanks for the info. I left the prime switch on for 5min then turned it to on and it seems to be working! I have started it and riden it just using the switch in the on position and its workin I don't get it but I just saved an a$$ load of money thanks for the replies.
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