Author Topic: Concours Luggage Latch spring and how to install it  (Read 261 times)

0 Members and 1 Guest are viewing this topic.

Offline LeeM

  • Training Wheels
  • *
  • Posts: 53
  • Maintain it for 120 drive it like I'm 70
    • Working on ways to save our asses.
  • AREA: Southwest Area
  • COG#: 12454
  • Membership Level: Active
Concours Luggage Latch spring and how to install it
« on: September 27, 2018, 05:06:22 am »
I was working on the bike and I decided to figure out why one of the side bag latches was not popping open nicely.

The latch is hard to figure out  because the moving parts are covered by the outside lid. The latch is a toggle with a floating pin. The latch is held open by a spring. One end of the spring is on the floating pin and the other end of the spring is popped over a square projection visible in the opened latch. Making and installing a new spring makes the latch work better.

The best result for explaining the lock is the attached sketch. The sketch omits a lot.  The part of interest for repair is the  toggle linkage and the two places the latch spring attaches.

You have to make two custom ends on a new spring. If you don't have a 5/32" diameter spring, buy one a couple of inches long at the hardware store.

You need to make two ends on the spring and the finished dimension needs to be 5/8" end-to-end. 'First make the hook. I stuck a piece of q-tip wood into the spring and pulled with the long nose pliers for my first hook. Protect your eyes against flying parts of steel when cutting the spring. The hook needs to be deep enough to stay looped over the floating pin while you wrangle the other end on to the square projection. When the hook is done, form the other end of the spring into about 2 coils bent at 90 degrees.  Protect your eyes when cutting.

The key dimension is to make the spring from end-to-end about 5/8" long.

Installing the spring takes two steps.
  • Hold the spring body with long nose pliers and work the hook end over the floating pin.
  • With a punch or jewelers screwdriver or cotton applicator stick, flip the coil end of the spring over the square pin.  The short spring coil slides down the stick and onto the square pin.

Here are the tools you need: vernier calipers to measure the spring and spring wire. Long nose pliers to shape spring ends, side cutters to cut spring, greasy cotton tip applicator to lubricate everything and slow spring rusting, punch or jewelers screwdriver or  wood cotton tip applicator stick to pop second spring end over the square peg.

Protect your eyes when cutting the spring.  I wear glasses and put my hand as a protective shield.
« Last Edit: September 27, 2018, 05:16:36 am by LeeM »

Offline Bob_C_CT

  • Sport Tourer
  • *****
  • Posts: 2079
  • AREA: Northeast Area
  • COG#: 9544
  • Membership Level: Active
Re: Concours Luggage Latch spring and how to install it
« Reply #1 on: September 27, 2018, 11:37:41 am »
Lee, thanks for posting your workup on making replacement springs.
Question: Is there a notch on the square post that keeps the spring hoop end retained or is just that the spring is alaways in tension to stay on the square post?
97 C10,ZRX Front, Meanstreak rim

Offline LeeM

  • Training Wheels
  • *
  • Posts: 53
  • Maintain it for 120 drive it like I'm 70
    • Working on ways to save our asses.
  • AREA: Southwest Area
  • COG#: 12454
  • Membership Level: Active
Re: Concours Luggage Latch spring and how to install it
« Reply #2 on: September 29, 2018, 06:34:02 pm »
Question is there a notch on the square post? I think there is a slight undercut. I think the latch base was made by a diecasting process.  A simple mold can't form the notch. I think they made some kind of undercut, but I have not disassembled the mechanism to see clearly what was done.

My other comment is, I had to make two springs to get one that worked. After about 2 weeks of use, the home made spring does not have quite enough tension to pop the latch open all the time. I stuck my hand in the meat grinder, eventually I will probably try making a better spring.

Offline The Wizard

  • Been riding since I was 9 yrs.old.getting to be old fart.
  • Crotch Rocket
  • ****
  • Posts: 1475
  • 'match need with source(used parts)'
    • have a need find a source/parts are parts
  • AREA: Southwest Area
  • COG#: 11328
  • Membership Level: Active
Re: Concours Luggage Latch spring and how to install it
« Reply #3 on: September 30, 2018, 08:33:52 am »
I use a dental hook on both ends,they are not hard to replace.But of course I have "A&B" key top latches, more than enough... Me
1964 Honda 55,1971 Honda CL 100,numerous Honda 350 twins,1971 Honda CL 450,1974 Honda CB 750(stolen),1971 Moto Guzzi Ambasador/Velorex sidecar,1975 Kawasaki Z1B
1976 Honda Goldwing (fully dressed)1973 Honda CB 450,1982 Yamaha Virago 750
1977 BMW R100/7(full dress) later Velorex sidecar mounted,1978 Yamaha XS750,1987 BMW K100RS
1996 Honda shadow 1100 ace,2000 Kawasaki Concours,1998,99,98,98+88,90+99 Concours for resurrection           CDA#540

Offline connieklr

  • Street Cruiser
  • ****
  • Posts: 869
  • AREA: Northeast Area
  • COG#: 1608
  • Membership Level: Active
Re: Concours Luggage Latch spring and how to install it
« Reply #4 on: September 30, 2018, 09:46:36 am »









________________
Guy Young
COG #1608
COG Life Member
Semi-Civilian
GB Young Services, LLC

Offline The Wizard

  • Been riding since I was 9 yrs.old.getting to be old fart.
  • Crotch Rocket
  • ****
  • Posts: 1475
  • 'match need with source(used parts)'
    • have a need find a source/parts are parts
  • AREA: Southwest Area
  • COG#: 11328
  • Membership Level: Active
Re: Concours Luggage Latch spring and how to install it
« Reply #5 on: October 02, 2018, 12:50:03 am »
very good pics...
1964 Honda 55,1971 Honda CL 100,numerous Honda 350 twins,1971 Honda CL 450,1974 Honda CB 750(stolen),1971 Moto Guzzi Ambasador/Velorex sidecar,1975 Kawasaki Z1B
1976 Honda Goldwing (fully dressed)1973 Honda CB 450,1982 Yamaha Virago 750
1977 BMW R100/7(full dress) later Velorex sidecar mounted,1978 Yamaha XS750,1987 BMW K100RS
1996 Honda shadow 1100 ace,2000 Kawasaki Concours,1998,99,98,98+88,90+99 Concours for resurrection           CDA#540