Author Topic: BSA Golden Flash Plunger side car mounts  (Read 218 times)

Offline Collide

  • Active
  • *
  • Posts: 4
  • Karma: 0
BSA Golden Flash Plunger side car mounts
« on: 06.03. 2019 21:38 »
Looking for help with restoring Golden Flash and adding a Watsonian side car, need help with frame mounts and pictures. Any help, info, resources etc would be greatly appreciated

Online lawnmowerman

  • Resident Legend
  • *****
  • Posts: 511
  • Karma: 8
  • 1959 Super Rocket. Kent, England
Re: BSA Golden Flash Plunger side car mounts
« Reply #1 on: 06.03. 2019 21:47 »
Hi Collide

Are you mounting the chair on the left or right?

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

Too old to Rock and Roll but too young to die  (Jethro Tull 1976)

Offline Collide

  • Active
  • *
  • Posts: 4
  • Karma: 0
Re: BSA Golden Flash Plunger side car mounts
« Reply #2 on: 07.03. 2019 00:08 »
Hello the sidecar is a right side monza. The BSA is a 1953

Offline WozzA

  • Wise & Enlightened
  • *
  • Posts: 1254
  • Karma: 16
  • Melbourne Australia
Re: BSA Golden Flash Plunger side car mounts
« Reply #3 on: 07.03. 2019 05:39 »
This may be a good starting reference point 4 you... 
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
The biggest lie I tell myself is
"I don't need to write that down, I'll remember it"

Offline Collide

  • Active
  • *
  • Posts: 4
  • Karma: 0
Re: BSA Golden Flash Plunger side car mounts
« Reply #4 on: 07.03. 2019 05:57 »
Thats a great start I was told it was a factory side car bike a the seller gave me a set of mounts to to fame but there not right thanks for the help Clyde

Offline Swarfcut

  • Resident Legend
  • *****
  • Posts: 545
  • Karma: 8
Re: BSA Golden Flash Plunger side car mounts
« Reply #5 on: 07.03. 2019 09:18 »
Hi Clyde... A sidecar bike will have the lower gearing required to pull a chair. A 49 tooth rear sprocket is the standard for sidecar, 42 teeth for solo. So easy to see if it is set up as a  sidecar bike. Gearbox sprocket is standard 19 teeth, solo and sidecar, but the 18 teeth A7  gearbox sprocket  sometimes fitted for heavy work.

 Swarfy.

Online lawnmowerman

  • Resident Legend
  • *****
  • Posts: 511
  • Karma: 8
  • 1959 Super Rocket. Kent, England
Re: BSA Golden Flash Plunger side car mounts
« Reply #6 on: 07.03. 2019 09:22 »
Hello the sidecar is a right side monza. The BSA is a 1953

Hi Clyde

I did not realise that Watsonian made a right side Monza - I bet the mudguard is rare!
I fitted a Monza (left hand) to a Matchless 650 a couple of years ago and it was fairly straightforward. I picked up most of the fittings from ebay and bike jumbles.
You will need to check the fork springs are for sidecar use and you will probably need to fit a smaller primary and/or gearbox sprocket.
Another issue may be checking that the kickstart has enough clearance.
If you have a sidecar brake then things may get interesting as the pedal normally sits next to the bike rear brake pedal so you can operate them both at the same time with your left foot. With a left hand braked chair you will be using both feet to brake  *eek*

Good luck with the project and keep us posted.

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

Too old to Rock and Roll but too young to die  (Jethro Tull 1976)