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Author Topic: Spark advance/timing problem CB500  (Read 1910 times)

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Offline michael_brown

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Spark advance/timing problem CB500
« on: September 04, 2012, 04:43:21 PM »
So, this weekend I was doing a shakedown run and felt like the bike was sluggish.  Came back and felt like it might be out of time. After I pulled the cover I noticed the spark advance was reallllllyyy rusty.  So, I marked the contact plate, removed it, took out the spark advance and disassembled it.  Cleaned all the rust off and lubed it to make sure everything was moving smoothly.  I then reinstalled it and the contact plate.  When trying to start the engine, it acts as if its out of time (ie...back firing, and not running).  I put the contact plate in the exact position it came off. 

SOOO, now I'm trying to check timing, and of course using the test light procedure I can't get it right.  The blue wire lights up with 12v wayy before the 1-4 F mark.  I can't seem to get it adjusted anywhere close to where the light is coming on as the 1-4 F mark comes up.  Any thoughts?  Is there any way to reassemble that spark advance incorrect?  It seemed like a pretty simple device.  THoughts, suggestions, links?
« Last Edit: September 04, 2012, 04:51:27 PM by michael_brown »
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Offline luap

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Re: Spark advance/timing problem CB500
« Reply #1 on: September 04, 2012, 04:58:27 PM »
did you try an reset the point gap? or advance or retard plate?
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Offline michael_brown

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Re: Spark advance/timing problem CB500
« Reply #2 on: September 04, 2012, 05:01:08 PM »
Didn't try resetting points gap.  Did put plate back in original position.  After it wouldn't start I tried moving the plate in both directions.  It seems as if no matter where I move the plate, the blue wire lights up 12v long before the 1-4 F mark comes up.  Just as the 1-4 F mark comes up the light goes out.  I'm so confused. 
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Offline TwoTired

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Re: Spark advance/timing problem CB500
« Reply #3 on: September 04, 2012, 05:06:53 PM »
The advancer assembly the one with the springs and weights can be put together with the cam 180 out of phase.
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Lloyd... (SOHC4 #11 Original Mail List)
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Offline michael_brown

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Re: Spark advance/timing problem CB500
« Reply #4 on: September 04, 2012, 05:35:56 PM »
^^^^Could you elaborate a bit?  I don't have it in front of me and I"m not following exactly what you are saying.  I think you are telling me that the cam could be installed backwards, which in my case explains the problem.
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Offline luap

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Re: Spark advance/timing problem CB500
« Reply #5 on: September 04, 2012, 05:46:24 PM »
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75-550 ffsc sold, 78-550 diamonte sold, 125s grasshopper sold, 76-550 puma sold, 78-550 tracker sold, 74-550 verde diablo Sold, 74-550 Noemani finished trying to sell. 72 500 hartail in the works
www.cb-town.com
"I dont need a bike covered in paint an chrome I know exactally bout how big my coc( is"

Offline michael_brown

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Re: Spark advance/timing problem CB500
« Reply #6 on: September 04, 2012, 06:15:28 PM »
Yeah, I figured it out.  I should have marked the cam in relation to the timing marks when I took it apart.  Then I didn't think about it going back together.
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