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Author Topic: Cb360 timing omg help.  (Read 549 times)

Offline MiniatureNinja

  • Posts: 454
Cb360 timing omg help.
« on: Jun 16, 2018, 22:30:07 »
Timing cb360 points, I cannot for the life of me get this right.

What happens is the test light stays in for half the stroke before LF mark, then turns right off after LT. Why are the points open for the entire time?
'75 Honda CB360 - thread

Offline irk miller

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Re: Cb360 timing omg help.
« Reply #1 on: Jun 16, 2018, 23:52:28 »
Make sure you have the cam and advancer right.  Make sure you're testing by rotating counterclockwise.  And, make sure you verifiably at TDC on the left side when it's on the LT mark.  Sounds like you are either rotating the wrong way, or you have the cam flipped.

Offline MiniatureNinja

  • Posts: 454
Re: Cb360 timing omg help.
« Reply #2 on: Jun 17, 2018, 01:01:28 »
Make sure you have the cam and advancer right.  Make sure you're testing by rotating counterclockwise.  And, make sure you verifiably at TDC on the left side when it's on the LT mark.  Sounds like you are either rotating the wrong way, or you have the cam flipped.

the points cam was backwards on the advancer (180* off)

is it normal for the points to remain on for several degrees after LF ?
'75 Honda CB360 - thread

Offline irk miller

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Re: Cb360 timing omg help.
« Reply #3 on: Jun 17, 2018, 09:52:55 »
the points cam was backwards on the advancer (180* off)

is it normal for the points to remain on for several degrees after LF ?
That means it's out of time.  That's what you're adjusting for.  Your gap and the points plate position affects when it comes on and off.

Offline jpmobius

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Re: Cb360 timing omg help.
« Reply #4 on: Jun 17, 2018, 10:52:49 »
Your dwell angle is incorrect.  This is the duration in crankshaft degrees that the points are closed.  This translates into how long the coil gets electricity and in turn has enough energy to create a spark.  It also determines how long the coil is "off" and gets to cool off.  You control this by setting the gap between the point faces, and this has to be done when the rubbing block is on the highest part of the cam lobe where the points will be open the farthest.  You MUST do this first, before you set the timing.  If you fool with the point gap after setting the timing, the timing will be out and you will have to reset.  Once you set the gap, leave it alone.  You can fool around with the timing all you want and the gap will remain the same.
Mobius


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Offline crazypj

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Re: Cb360 timing omg help.
« Reply #6 on: Jun 17, 2018, 12:48:45 »
You did set points gap when they were at maximum opening? (0.014")
'you can take my word for it or argue until you find out I'm right'
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Offline MiniatureNinja

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Re: Cb360 timing omg help.
« Reply #7 on: Jun 17, 2018, 13:50:53 »
at what what point will the points be open the farthest? is that about 90* after each fire?

I did set the gap but I have never had a vehicle were the points pivot at two parts... so it seams that when I am trying to adjust the gap it pushes the bottom part of the points arm more into the cam throwing everything off.
'75 Honda CB360 - thread

Offline irk miller

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Re: Cb360 timing omg help.
« Reply #8 on: Jun 17, 2018, 13:59:09 »
The cam is eccentric, so the points close at the thickest part of the cam.

Offline MiniatureNinja

  • Posts: 454
Re: Cb360 timing omg help.
« Reply #9 on: Jun 17, 2018, 14:03:27 »
You did set points gap when they were at maximum opening? (0.014")

ok so this is another example of CMC misleading people.

gonna have to do this right now. LOL

so use the 4 small screws to adjust the gap, and then use the base plate to adjust the timing. right?
« Last Edit: Jun 17, 2018, 14:04:59 by MiniatureNinja »
'75 Honda CB360 - thread