Author Topic: Rebuilding Start button - CB550F  (Read 3739 times)

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Offline Krankyoptimist

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Rebuilding Start button - CB550F
« on: December 25, 2014, 08:41:01 pm »
Ok so I did something stupid. I should have read previous forum posts about taking apart the components of the right handlebar starter/kill switch shell. Don't do it unless absolutely necessary!  As was stated in said posts, there's a pretty good chance that the parts of your starter button have deteriorated but still work as long as you don't try to remove them from the outer aluminum shell.  Doh!

Well long story short I don't want to shell out for an NOS replacement.  And although there were some significant chunks of the original plastic remaining it was too rotten to try to repair.  So I gathered up all of the little springs, balls, doohickeys, and assorted doodads and some impromptu fabrication was in order....

Owned:
'76 CB550F
'70 CT70 
'09 Vespa S150 (oh please, just stop)

Offline bjbuchanan

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Re: Start button - CB550F
« Reply #1 on: December 25, 2014, 09:01:54 pm »
Take my money NOW
The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

Don't trust me alone with a claw hammer and some pliers

Offline dave500

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Re: Start button - CB550F
« Reply #2 on: December 25, 2014, 09:10:33 pm »
brilliant,great finesse,you make it look easy?

Offline Krankyoptimist

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Re: Start button - CB550F
« Reply #3 on: December 25, 2014, 09:31:21 pm »
Ha. It's flip down 3.0 magnifiers and a 12hr caffeine hiatus.   ;D 
Owned:
'76 CB550F
'70 CT70 
'09 Vespa S150 (oh please, just stop)

Offline goldarrow

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Re: Start button - CB550F
« Reply #4 on: December 25, 2014, 09:32:17 pm »
Yeah. I was about to ask how much time you spent on doing that ;)
Life Is Full Of Challenges - And My Backyard Is Full Of SOHC4's

CB550 K0
CB750 K0, K2, K23 JDM, K45, K5
And the little ones z50r, xr50r, st90


750k5 http://forums.sohc4.net/index.php?topic=114817.0

Offline dave500

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Re: Start button - CB550F
« Reply #5 on: December 25, 2014, 09:34:20 pm »
coffee?,beer mate,we wouldn't get anything done otherwise!

Offline Krankyoptimist

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Re: Start button - CB550F
« Reply #6 on: December 25, 2014, 09:42:47 pm »
Enh.  I had a couple of hours to kill today while all the out of town relatives napped off the feast.  It's made from fiberglass resin poured in a sheet and CA glue.  Thought that might hold up to some heat better than plastic?  Seems surprisingly strong. Hopefully it will hold up. It's a nice snug fit in its home. And of course this guy will NOT be taking it apart again.

Thought it might make a nice post for others in my predicament who wondered if it could actually be done.
Owned:
'76 CB550F
'70 CT70 
'09 Vespa S150 (oh please, just stop)

Offline dave500

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Re: Start button - CB550F
« Reply #7 on: December 25, 2014, 09:51:11 pm »
you might post it in the "tips and tricks"section?you turned a no longer available part into a new just made one.

Offline faux fiddy

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Re: Start button - CB550F
« Reply #8 on: December 26, 2014, 12:52:24 am »
I'm not sure what I'm seeing there, but lots of times people will ditch their horn and use the switch for a starter button.

I've been in those a few times and  they're a pain in the butt, and the whole time it was open I thought I fooked it.  It's always a relief when the screws go back in and it works.

I know the springs off a click type ball point pen work if you cut off a half cm. piece.
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Offline SohRon

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Re: Start button - CB550F
« Reply #9 on: December 26, 2014, 07:52:34 am »
Very nicely done and kudos for not losing all of your parts when the thing exploded! Patterns of the individual pieces would be nice to share on the Tips n Tricks page.

Good job! See... I knew it could be done!  ;D
"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline Krankyoptimist

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Re: Start button - CB550F
« Reply #10 on: December 26, 2014, 11:29:44 am »
I free handed mine pretty much but as Sohron suggests a template might be nice for those who want to attempt. And who's going to refuse the switch master right?  :) So here's a "blueprint" for you guys. A little rough but dimensionally correct. Just like putting together a gingerbread house. I used fiberglass resin as my gingerbread, from some packaging prototypes I had laying around, sanded to 1.5mm thick. But there should be other options for base material than that.  Phenolic board probably best?  Then a very small pair of clamps, a metric caliper, and a dremel are only tools needed.

The binder is CA glue. I found the medium thickness to be very easy to work with because it didn't run everywhere and sort of made fillets. Also the tiny slots in the side can fairly well be butchered and it really doesn't matter too terribly much as the CA will fill the gaps. Also on that note I glued the doodoo out of the pieces. If it ever comes apart I'm confident I can preserve all my original Honda bits by grinding away my newer materials.

Not sure how to post this to tips and tricks as suggested so if someone thinks that's where this needs to be let me know how?  Hope someone gets some use from the info as I have certainly benefitted my fair share from the info of all you others!  Good luck!
Owned:
'76 CB550F
'70 CT70 
'09 Vespa S150 (oh please, just stop)

Offline shawn57nomad

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Re: Rebuilding Start button - CB550F
« Reply #11 on: July 19, 2015, 11:21:55 pm »
Great repair!  Finished mine as I had ordered the wrong switch for my 76 550F1.  Only about 5 hours and plenty of caffeine!  So much in fact I went ahead and wired it to the bike at 1A.M.  Fun to hear it fire!  Now to get some fuel in it as it hasn't ran since 94.

Offline Krankyoptimist

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Re: Rebuilding Start button - CB550F
« Reply #12 on: July 20, 2015, 04:28:19 am »
Great!  Glad you got some use from the post. I've got 1,000 miles on my switch now and knock on wood no issues.
Owned:
'76 CB550F
'70 CT70 
'09 Vespa S150 (oh please, just stop)

Offline shawn57nomad

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Re: Rebuilding Start button - CB550F
« Reply #13 on: September 09, 2015, 07:31:11 am »
Thanks for the write-up!  This fixed my switch and did mine in about 4 hours at the kitchen table amidst family activities.  Fun fun and the SOHC Family here is great!

Offline andyvh1959

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Re: Rebuilding Start button - CB550F
« Reply #14 on: September 09, 2015, 10:17:21 am »
Just had a thought. I wonder if someone with a 3D printer may be able to reproduce these parts at home.

Offline RevDoc

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Re: Rebuilding Start button - CB550F
« Reply #15 on: September 09, 2015, 01:37:41 pm »
Just had a thought. I wonder if someone with a 3D printer may be able to reproduce these parts at home.

WOW, great idea! Heck, if people are building everything from surgical parts to military hardware( read:guns)with 3-D printers, than someone should be able to build these. How about it, all you computor wizards!?
Dana

'78 CB550K--Angie
'82 CB750 Custom--Eva



As soon as you straddle a bike expect every other driver on the road to suddenly start competeing for the title "Dumbestsonofa#$%*inallNorthAmerica!!"