1985 Honda Nighthawk 450 - Motorcycle Forum
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post #1 of 9 (permalink) Old 06-17-2008, 06:32 PM Thread Starter
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1985 Honda Nighthawk 450

I recently bought a '85 Honda Nighthawk cb450 and I cant get it to start. It sounds like it wants to run but as soon as you let off the starter it quits firing. Ive replaced spark plugs which have spark and the battery and ivedrained the carbs/gas tank. I took off the carbs and blew out the lines and jets to try to remove anyblockages if there were any. Im wondering if it still could be a carb problem or if maybe the coil is putting off to weak of spark because it comes closest to running when its fully choked and theres no throttle. Any help will do.
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post #2 of 9 (permalink) Old 06-17-2008, 06:53 PM
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Sounds like a problem with the carbonator. Have you tried to start it with ether, just to verify that it would run if it had fuel?

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post #3 of 9 (permalink) Old 06-17-2008, 06:55 PM Thread Starter
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Yeah ive tried spraying starter fluid from the air box but its like it rejects it. It's as if it instantly flood it when even the smallest amount of fuel is introduced.
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post #4 of 9 (permalink) Old 06-17-2008, 07:18 PM
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Originally Posted by Longitudinal View Post
Sounds like a problem with the carbonator.
Is that what puts carbon deposits in your engine? Sounds like a Schwarzenegger character.


Is your timing maybe out of whack? Was it running fine and then just started doing this or is this your first attempt at starting? Or maybe it was recently taken apart? Or hasn’t run in years?
post #5 of 9 (permalink) Old 06-17-2008, 07:28 PM Thread Starter
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well suposedly it was running a couple weeks ago... not sure about that anymore, but anyway i dont think its the timing, but i guess it could be. Any easy way to figure out it thats the issue?
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post #6 of 9 (permalink) Old 06-19-2008, 01:05 AM
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When I took mine out of storage this year before I sold it. It did not want to run I think it had to do with stablizer in the gas as well as weather (cold) mine was every warm blooded. I alwas had to choke mine even in the summer for about 5 min be for I could ride it with out stalling.

You sead you sprayed carbs but did you break them down and clean the jets and valves with carb cleaner.
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post #7 of 9 (permalink) Old 08-01-2010, 01:19 PM
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I have an '83 nighthawk 750 that won't start. One side of the engine sometimes tries and get's hot. If I get it going and give it any gas it stops.
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post #8 of 9 (permalink) Old 08-02-2010, 05:34 PM
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I am new to this forum stuff but I have a 1985 450 Nighthawk that needs a right side battery cover panel..they quit makin' em and I don't know where to look for one...help!!!
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post #9 of 9 (permalink) Old 08-02-2010, 07:54 PM
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Careful not to hijack the thread, but ebay or try a google search.

Last edited by jlauden; 08-02-2010 at 08:01 PM. Reason: Don't want to support hijacking
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