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Author Topic: 1972 cb/cl 100  (Read 25975 times)

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #75 on: Jun 03, 2015, 23:07:49 »
did you check point gap and static timing?  If you can keep her idling for a bit check timing w strobe light.


Park her w exhaust pointed towards sun, on a "no breeze" evening.  When she starts to bog on throttle, watch exhaust for black smoke.  Black smoke says shes too rich and need to jet down.  Or keep her bogging for a bit.  Then check plug.  If its cleaner and white, shes too lean.  black plug = rich.
I set the gap a couple months ago, before any attempt to start it. I didn't use a light to verify,  but I plan to recheck it this weekend. Thanks for the sun trick.

Offline trek97

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Re: 1972 cb/cl 100
« Reply #76 on: Jun 04, 2015, 07:46:05 »
Its best to time w a light.  Ive found the static time is just close enough to get her started and running.  Not riding.  You may be surprised just how far off static time is once shes running.  And the light will show you shes advancing properly w rpm.
« Last Edit: Jun 04, 2015, 07:47:56 by trek97 »

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #77 on: Jun 04, 2015, 07:59:36 »
I never realized it would run with timing off. I've researched and read the manual and know how to check the static timing with a light. How do I check it running with a strobe? Same idea? Do I just leave the light attached?

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #78 on: Jun 04, 2015, 16:51:35 »
Ignore my ignorance, I looked up the strobe light.

Offline trek97

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Re: 1972 cb/cl 100
« Reply #79 on: Jun 05, 2015, 07:15:38 »
I use a Craftsman I bought 30 years ago.

This should do it.. Stroboscopic timing light.
http://www.harborfreight.com/timing-light-with-advance-40963.html

Or just borrow one if you can. 

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #80 on: Jun 05, 2015, 07:36:20 »
Cool, thanks Trek. My point is capped at .4mm. Book says to have it between .3mm and.4mm. Should I tightened it up to .3? I tired to do the static light test but my battery died. I'll have to charge it up today.

Offline trek97

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Re: 1972 cb/cl 100
« Reply #81 on: Jun 05, 2015, 07:52:13 »
.4 is good.   ;)

.3 = smaller gap = gives the coil more time to build charge = less time to cool down between cycles = melting coil = more charge available for plug spark.

.4 = larger gap = gives the coil less time to build charge = more time to cool down between cycles = less charge sent to plug spark.

I just saw dougs coils melted down enroute to Kentucky Spring Thaw...not pretty.  Halfway between Maryland and Kentucky.  His points were worn down...caused his gap to get too small, out of spec.

I use a smaller gap on my 360.  But, it gets checked periodically.


Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #82 on: Jun 05, 2015, 08:01:53 »
Ok, great. This afternoon the carb is coming back off for a full clean, and to push the throttle neddle up a clip. I read that that fixed a problem like mine on another build.

Offline trek97

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Re: 1972 cb/cl 100
« Reply #83 on: Jun 05, 2015, 21:22:26 »
Ok, great. This afternoon the carb is coming back off for a full clean, and to push the throttle neddle up a clip. I read that that fixed a problem like mine on another build.

(raise clip) = lower needle = leaner
« Last Edit: Jun 05, 2015, 21:24:30 by trek97 »

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #84 on: Jun 05, 2015, 21:32:49 »
Haha, I'm always learning. While getting my daily rider inspected today I talked to the guy at the shop about the cb. He told me the same thing. Before going there  I popped the needle clip a click higher than original location. (Lower needle) it started on third kick, but would bogg if I rolled the throttle. I just dropped the needle back down, but went a click lower(so richer). I'll try to start it again tomorrow.  Kids are sleeping now. If I keep failing, I'm going to ask for the proper carb for my birthday. This one might be too far off.

Offline trek97

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Re: 1972 cb/cl 100
« Reply #85 on: Jun 06, 2015, 00:06:43 »
Are you seeing any black smoke when it bogs?

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #86 on: Jun 06, 2015, 07:35:47 »
No smoke yesterday. Wouldn't let me give it any gas, if I tried even a little it would start to stall. Choke open half idle set to one turn in from touching slide, no throttle. It would run for about a minute. When it was running for more than a minute the other day it had some light white smoke as it heated up.

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #87 on: Jun 06, 2015, 10:01:03 »
Found this book for sale on a library shelf. They probably thought it was a little out of date with a 1999 copyright. Just Read both chapters on fuel system and timing. We'll see what I can figure out today.

Offline trek97

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Re: 1972 cb/cl 100
« Reply #88 on: Jun 06, 2015, 11:47:36 »
white "smoke" is only steam from condensation inside the things and stuff.  Heating up and drying out.

dont give her any throttle until choke is wide open.  The added restriction+vacuum "may" suck fuel through jets like a garden hose.  When you give her throttle the building rpms gotta get something from somewhere, and if it cant get enough fresh air....well.  Shes sucking whatever she can get from where ever she can find it.

Offline JB77

  • Posts: 231
Re: 1972 cb/cl 100
« Reply #89 on: Jun 06, 2015, 11:52:45 »
Ok, cool. That's what I figured about the smoke. Thanks for the throttle info. I'll go out and try again in a bit. If nothing else, at least I am learning about carbs.