Need Help - 1998 CBR600F3 - Wrist Twisters
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post #1 of 6 Old 09-14-2018, 05:20 PM Thread Starter
Milites Gregarius
 
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Need Help - 1998 CBR600F3

My daughter's boyfriend, good kid, just bought a 1998 CBR600F3. It shut off on him on the way home from purchase. I've committed to helping him with it. Anyhooo.... This thing is a carbureted bike with a fuel pump and a petcock on the tank. Can someone, please, explain this setup to me? Why the pump to feed carbs? The tank doesn't appear to sit below carb level...

The bike acts like it's not getting fuel. I just started to look into it and noted the setup. I'm digging into it tomorrow. If it's not getting fuel, can I connect the tank directly to the fuel line to the carbs for a shop test to, at least, isolate the issue?

Thanks in advance for any help.

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post #2 of 6 Old 09-14-2018, 05:38 PM
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I would check that the gas is on the "on" and/or "reserve" setting, after making sure there is actually fuel in the tank.

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post #3 of 6 Old 09-14-2018, 06:02 PM Thread Starter
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Quote:
Originally Posted by nathanktm View Post
I would check that the gas is on the "on" and/or "reserve" setting, after making sure there is actually fuel in the tank.

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post #4 of 6 Old 09-14-2018, 10:06 PM
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My 700S requires vacuum in order to work. The control is on the petcock and no matter what position the switch is in, it will require vacuum to actually flow.

If it has one, it's a very small connection, probably on the backside.

You should be able to test the flow with a coffee can.

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post #5 of 6 Old 09-14-2018, 10:49 PM
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Our sv650 has a similar setup. As long as there's a reasonable amount of fuel in the tank, you can bypass the pump to make sure that isn't the issue .

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post #6 of 6 Old 09-16-2018, 08:14 AM Thread Starter
Milites Gregarius
 
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Got it running. No vacuum lead to the petcock. I drained the carb bowls. Found I was getting no fuel to the carbs. Then I bypassed the pump and filter for a test. She fired up and ran fine on the stand. The fuel line coming from the petcock tore so I re-plumbed the setup paying particular attention to the inlet and outlet on the pump and filter as he had changed the fuel pump out himself. Anyhoo.... Once I got it all back together, she fired right back up and he took it for a ride. No problems.

I'm thinking he may have switched the inlet and outlet when he replaced the pump. Whatever... It's running and he learned a few things.

Thanks for the input!
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