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Old 07-08-2012, 10:24 AM   #1
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honda cb 450 1973


I have tried every thing to get it running,drained fuel,new carbs,new points,battery. It is a very clean bike I am 2nd owner. I get it to run for a few seconds then just dies,Any suggestions.

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Old 07-08-2012, 10:31 AM   #2
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honda cb 450 1973


Fuel filter? Did you spray something high octane such as carb cleaner into the carb to keep it running?

I had a 1971 cb 175 and a cb 750, plus a slew of dirtbikes and one moped. . All of them needed the occasional fuel system clean out.

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Old 07-08-2012, 10:33 AM   #3
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honda cb 450 1973


yes cleaned the carbs kits and all
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Old 07-08-2012, 10:33 AM   #4
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honda cb 450 1973


And is it the correct battery? 12 volt I think is correct. I bought the 175, it had a 6 volt battery in it and wouldn't start. I bought the correct 12 volt and instantly it cranked and ran just fine.
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Old 07-08-2012, 10:35 AM   #5
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honda cb 450 1973


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yes cleaned the carbs kits and all
I'm no expert mechanic but is the float working properly? You may need to clean it all again and make sure there is a clear fuel line, not clogged. It sounds to me as if it's a lack of fuel issue, possibly a carb adjustment.
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Old 07-08-2012, 10:37 AM   #6
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honda cb 450 1973


yes purchased from motor cycle shop.I saw one entry adjust valves do you think this is it
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Old 07-08-2012, 01:08 PM   #7
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honda cb 450 1973


I doubt the valves are causing this issue. It is most likely fuel. The carbs being cleaned also need balanced. That is somewhat of an art and requires a special piece of equipment, a manometer. If you changed carbs and messed with the linkage between them, then I suspect this is the problem.
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Old 07-08-2012, 01:12 PM   #8
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honda cb 450 1973


Might consider checking the exhaust pipe/pipes for critter nest.

Have seen that one more than once.
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Old 07-08-2012, 01:13 PM   #9
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honda cb 450 1973


Sorry double post.
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Old 07-08-2012, 05:22 PM   #10
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honda cb 450 1973


Quote:
Originally Posted by mcdonaldjoe View Post
I have tried every thing to get it running,drained fuel,new carbs,new points,battery. It is a very clean bike I am 2nd owner. I get it to run for a few seconds then just dies,Any suggestions.
There's a 90% chance this is a fuel problem.

Are the carbs brand new, or rebuilt, or cleaned? I'm a bit confused.

If they're new, they probably are not adjusted properly. Even so, it sounds as though your carb floats are not letting the needle valve open.

I'll probably get in trouble for linking this site, but you're going to get far more information about your bike from the site below.

http://www.hondatwins.net/forum/inde...56e53b46853ed2
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Old 07-08-2012, 06:07 PM   #11
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honda cb 450 1973


We are here to offer the best help---that is what you are doing---

OP--keep us informed--A lot of us spent many happy hours on Hondas from that era.
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Old 07-08-2012, 06:17 PM   #12
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honda cb 450 1973


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We are here to offer the best help---that is what you are doing---

OP--keep us informed--A lot of us spent many happy hours on Hondas from that era.
My college bike was a '74 CB360T. A 6-speed. Great little cycle, that I wish I still had it. I had no idea, at the time, how cool it was.





Currently I've got a '73 CL350 sitting in my garage. I'm trying to get the title problems solved. But if I do, I'm going to be the coolest old fart on 2 wheels!




My "regular" rider is an '05 Kawasaki 1500 Vulcan Classic. A Harley Wannabe. It's smooooooooth...


Last edited by DrHicks; 07-08-2012 at 06:27 PM.
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Old 07-08-2012, 06:29 PM   #13
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honda cb 450 1973


I learned on a Honda 50----and had a 90 for use off the road---it was a street bike but never had plates--Your bike would have been a dream---nice ride--I hope you can get a title---

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