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Author Topic: '71 CB100/125 (the un scooter)  (Read 24322 times)

Offline 45exmayor

  • Posts: 127
http://www.dotheton.com/forum/index.php?topic=66379.
'71 CB100/125
'02 monster 620 (sold)
'66 Triumph T100SC(sold)

Offline WhyNot

  • Posts: 1201
  • ~~~If it ain't raining, I'm riding~~{iii}?~~prost~
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline JB77

  • Posts: 231
Re: '71 CB100/125 (the un scooter)
« Reply #32 on: Jul 04, 2015, 15:40:38 »
Cool thanks. I've been searching for a 6 volt tail like that. I'll go your route when the time comes.

Offline 45exmayor

  • Posts: 127
Re: '71 CB100/125 (the un scooter)
« Reply #33 on: Jul 05, 2015, 18:49:08 »
Made some good progress on the frame today.  Pressed in the races for the tapered steering bearings using a threaded rod with big washers.  Got them in strait and most of the way.  Finished setting them with a large socket upside down, a short extension and a dead blow hammer.  Next was the new swing arm bushings.  Put a C clamp in the workmate and used a deep socket with an extension for leverage.  That got them most of the way in.  Finished them up with the swing arm bolt with large washers on each side.  Seems really good, no side play then installed in the frame.
Next week I will set the motor in th frame.  Going to try a new idea.  Last time I had the frame on the pit bull standard and lifted the motor with a small floor jack.  It was a pain.  This time, I will set the motor on an upside down milk crate and lower th frame over it by letting down the straps it is hanging from the floor joists with.  That should give more wiggle room getting the 2 rear bolts in and eliminate the risk of the motor slipping and falling off of th jack.  More later on how it worked out.  The seat pan is at the upholsterers and should be back this week.  Need to get my friend going on the wheels and finish up the wiring. At this point in the project I am really glad I spent the extra time bagging and labeling when I tore it apart.  It appears I haven't lost or thrown out anything YET!
« Last Edit: Mar 31, 2016, 19:38:37 by 45exmayor »
http://www.dotheton.com/forum/index.php?topic=66379.
'71 CB100/125
'02 monster 620 (sold)
'66 Triumph T100SC(sold)

Offline trek97

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Re: '71 CB100/125 (the un scooter)
« Reply #34 on: Jul 07, 2015, 08:29:19 »
I did the same.  Assembled frame/forks/wheels.  Laid engine down on rags then placed frame over engine. 

Let the "electric white tail deer skinner" do all the heavy lifting.  ;)
« Last Edit: Aug 07, 2015, 00:02:34 by trek97 »

Offline 45exmayor

  • Posts: 127
Re: '71 CB100/125 (the un scooter)
« Reply #35 on: Jul 07, 2015, 19:04:56 »
Got the valves and points set and the motor installed back in the frame.  The milk crate trick didn't work (not enough room to fit the bottom rear bolt) so I followed trek's lead and set the motor on the floor.  Also covered the front motor mount tube with three layers of painters tape to keep,from scratching it.  A little alignment with a punch and lol the bolts slipped in.  The po had braised the huge '76 muffler to the head pipe so I need to get the brazing off and clean the end of the pipe before I can fit a cone engineering quite muffler.  I have read all of the builds saying that I need to run a stock air box and pipe.  But I don't have the stock box, the '76 box I got with the motor won't fit my frame and I have always had a tendency to try different things since I was a kid building drag cars in SoCal in the '60's.  And since I have lots of time I will work to sort it out. First I will put an extension on the carb to create a velocity and if I am not satisfied with that I will try an oval k&n that has more volume.
Included a pic of the "tool" I used to install the steering races in the head tube.
http://www.dotheton.com/forum/index.php?topic=66379.
'71 CB100/125
'02 monster 620 (sold)
'66 Triumph T100SC(sold)

Offline WhyNot

  • Posts: 1201
  • ~~~If it ain't raining, I'm riding~~{iii}?~~prost~
Re: '71 CB100/125 (the un scooter)
« Reply #36 on: Jul 07, 2015, 19:32:09 »
^^^^^^dayyyyyum dude^^^^^^^^^^^^

You, trek, and jb are putting me to shame on my little CB100.

Oh well.................Looks good...you'll have her up and running, riding in no time.
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline JB77

  • Posts: 231
Re: '71 CB100/125 (the un scooter)
« Reply #37 on: Jul 07, 2015, 21:41:28 »
I was thinking about extending the carb inlet the last two days. What type of material you looking to try. I was thinking of trying to find a radiator hose with the same diameter as the carb and working from there.

Offline trek97

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Re: '71 CB100/125 (the un scooter)
« Reply #38 on: Jul 07, 2015, 21:56:14 »
Now I dont know nothing about the mechanically operated slides.  But, I am willing to bet you wont have too much trouble jetting and adjusting needle to get her to run decent.  Since you are physically in control of both slide lift (air flow) & needle position (fuel metering).  Unless of course...tweaking comes down to a needle taper issue.

Vacuum operated slides like the 360 is what gives the fits.  Its all about atmospheric pressures and stuff like that.  When things breathe easier the slides lift too early dumping fuel in before rpms have built enough for consumption...I believe.   ;)

BTW.  My 100 is bone stock intake and exhaust...and staying that way.
« Last Edit: Jul 07, 2015, 21:58:16 by trek97 »

Offline 45exmayor

  • Posts: 127
Re: '71 CB100/125 (the un scooter)
« Reply #39 on: Jul 07, 2015, 22:30:16 »
JB
I was thinking of trying to find some thin wall aluminum tubing and clamp it over the carb and slide the filter over that.  I think a 3 to 31/2 inch extension will create a velocity stack that should smooth the air flow.
http://www.dotheton.com/forum/index.php?topic=66379.
'71 CB100/125
'02 monster 620 (sold)
'66 Triumph T100SC(sold)