Question about 1987 Honda CBX 250

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Can't get my CB750to run right

I have a 1982 Honda CB750C that I bought a while ago. it was a mess, but have been rebuilding it. It's not my first rebuild, but I am having troubles getting it to run.
I seem to have a problem with the carbs> I have taken them off and cleaned them all the jets and needle jets the works I also replaced the fuel lines between the carbs. After installing them on the bike I can't get it run roght at all. It runs weird, backfiring sometimes and then not stating at all others. I can tell that sometimes i'm only running on three cylinders. I have tried adjusting the pilot screws to a neutral spec ( from maunal) but that didn't seem to do anything.
I got nothing left and my car just died so I'd like another form of transport. any ideas what this may be?

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  • Carl Holland Jun 17, 2009

    Well I have checked the timing already it's dead on. It got to be a fuel problem but too lean to rich? I don't know

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You MUST synchronize the carburetors.
It is a task that involves some special tools (carb synchronizer)
Take a look on this forums:

http://www.cb1100f.net/modules.php?name=Forums

Posted on Dec 02, 2009

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Sounds almost like a timing problem. Have you had the head off? Has someone else?
You should be able to check the timing from the maunal. Valve and ignition.
If it's a fuel problem and it's popping through the exhaust it's too lean. Be sure you have the proper fuel filter and it's clean.

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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