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Old 07-23-2009, 01:51 PM   #1
dmediaJLH
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1992 Honda Nighthawk 750 won't start

Hey guys.

I'm having some issues getting my bike to start and stay running after driving it to work last night. It stalled out on the way home, had to push it the last 1.4mi. I'm pretty sure this is related to the petcock diaphragm replacement kit I installed 2 nights ago, but I can't be certain because the bike rode fine yesterday (day after install) during the day and then on my ride to work.

Another possibility is that I left the choke on as I pulled away from work and rode with it on for 3/4mi. perhaps. This could've happened, as I'm pretty new to motorcycles (been on a 50cc moped for awhile ).

Any ideas? Thanks for reading.

Last edited by dmediaJLH; 07-23-2009 at 01:52 PM. Reason: clarify title
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Old 07-23-2009, 02:01 PM   #2
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Big BUMP for my buddy getting a bike and bringing me back to two wheels.

Anyone know where the screens are supposed to be in this petcock?

We cant find any specific exploded diagrams, anyone know where there might be one?
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Old 07-23-2009, 02:02 PM   #3
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Is this old Martin's bike?
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Old 07-23-2009, 02:06 PM   #4
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http://www.bikebandit.com/assets/sch.../H01910068.gif

you could probably check the petcock by removing the fuel line (#2) before the carb. i am guessing that it is vacuum operated (vacuum through #17), so turn the motor over and fuel should start pumping out. if fuel comes out, move to the next idea.
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Old 07-23-2009, 02:26 PM   #5
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Try this website as well: http://hondanighthawks.net/
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Old 07-23-2009, 02:31 PM   #6
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Quote:
Originally Posted by Irak View Post
Is this old Martin's bike?
Indeed. And thanks for the link. He doesn't have any info on petcocks other than how to clean one, but there's a wealth of other stuff there that will certainly come in handy at some point.

Last edited by dmediaJLH; 07-23-2009 at 02:36 PM.
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Old 07-23-2009, 02:33 PM   #7
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give me a moment mang. I'm waiting for one of the techs to get free.
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Old 07-23-2009, 02:33 PM   #8
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start with simple and work your way to the more difficult things. remember that these bikes are all pretty simple, and the only things needed to make them run (or any motor) are fuel, air, and spark.
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Old 07-23-2009, 02:37 PM   #9
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give me a moment mang. I'm waiting for one of the techs to get free.
Much appreciated
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Old 07-23-2009, 02:46 PM   #10
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Check and see if there is any debri in the line between the fuel valve and the carbs. Might of had something go through it when you rebuilt it.
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Old 07-23-2009, 04:21 PM   #11
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Turns out the large diaphragm was pinched. Robopath and I took the petcock apart again, smoothed things out, and now it sounds better than when I had it running yesterday. Thanks for your help Martin.
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Old 07-23-2009, 04:24 PM   #12
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Old 07-23-2009, 04:27 PM   #13
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Old 07-23-2009, 05:47 PM   #14
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It was a really simple fix. That big diaphragm was just barely pinched. Weird thing was that even though every other replacement part in the kit was clearly a perfect match for the OEM part, the big diaphragm was notably different than the one installed.

I wish we would have known where that exploded diagram was before we started.

Even though we had to take it apart twice, we learned a lot about the fuel system.

I think dmedia would agree, it was actually a great learning experience.
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Old 07-23-2009, 06:01 PM   #15
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Good seeing you the other day man! tis almost beer thirty fyi
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Old 07-23-2009, 06:01 PM   #16
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Good seeing you the other day man! tis almost beer thirty fyi
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