Author Topic: Rotary Valve installation  (Read 123 times)

0 Members and 1 Guest are viewing this topic.

Offline JWsDreamMachines

  • Trade Count: (0)
  • New Member
  • *
  • Posts: 1
Rotary Valve installation
« on: January 06, 2022, 12:31:54 PM »
I searched the forum for a "how to" tutorial for the removal and installation of the rotary valve for a BS200MKII but struck out. Can anyone help an old man out?

Offline OldSwartout

  • Global Moderator
  • Trade Count: (0)
  • *******
  • Posts: 1251
Re: Rotary Valve installation
« Reply #1 on: January 06, 2022, 06:08:06 PM »
If you haven't yet, download the 50-175 Service Manual from the Downloads section. The 175 technical manual is more specific, but the scanned photos are not good in it.
The rotary valve should just slide off the toothed collar (hub). If yours is stuck, try some PB Blaster or other penetrant, or if rusty, some rust remover solution. You may have to try to work something behind it, working from the intake port area.  If you have the cylinders off, you can push from the inside of the crankcase through the intake port.  Even a suction cup or two might work if you smear a little oil on the surface as there isn't really a good way to grab them.
When replacing them, there is a R and an L molded into the surface at the hub of the rotary valve which has to be lined up with the locating pin in the toothed collar for the appropriate side.
Karl Swartout
Mooresville, IN
BS175 Roadracer. BS200RS, BS175HS



Comments (0)
By: Steve Swan

Comments (0)
By: rwgibbon

Comments (0)
By: rwgibbon

Comments (0)
By: rwgibbon


Gtr Gto rear grab rail
Date: 01/17/2022 08:15 am
Time Left:
Mud flap wanted
Date: 12/29/2021 08:31 pm
Time Left:
175 Dual Twin Wanted

Date: 12/24/2021 09:44 am
Time Left:
BS 90 Front Brake Lever
Date: 12/17/2021 12:26 pm
Time Left:

Recent Downloads added

BS200 Mk II RS & MK II SS Exclusive Parts
Rating: (None)
Filesize: 358.29KB
Date: March 07, 2021, 07:30:10 PM
1970 sales brochure
Rating: *****
Filesize: 6753.33KB
Date: July 16, 2020, 10:01:18 PM
2018 Article in Motorcycle Classics
Rating: (None)
Filesize: 3877.88KB
Date: June 29, 2020, 05:26:00 PM
350 GTR pdf version

Rating: *****
Filesize: 7366.26KB
Date: March 14, 2020, 09:41:23 AM

Powered by EzPortal