News:

Mat Oxley 1986 IOM TT


click above to read more about Mat.

Main Menu

Rear Master Cylinder Seal Orientation

Started by IICYCLE, December 31, 2020, 11:30:22 AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

IICYCLE

Getting ready to install rear master cylinder kit on my rd400. Does anyone know which way the tapered seal fits(not the one that fits on the spring but the other) ? Happy New Year :toot:

SoCal250

The seal "open" side faces up in the bore so as it is pushed in the pressure expands the sealing flange. (smaller diameter is away from the fluid)
75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)

IICYCLE

#2
Perfect, thanks for the quick reply ! By the way, what type of grease do you have on the seal ?

SoCal250

Quote from: IICYCLE on December 31, 2020, 01:51:32 PM
By the way, what type of grease do you have on the seal ?

It's "red rubber grease", which is used for master cylinder & caliper rebuilding
https://www.amazon.com/GENUINE-Corrosion-Oxidation-Resistant-TS-2-34-04/dp/B01L63SXSU/ref=pd_sbs_263_1/141-6746217-5714839

Good info here that I have referred to in the past: Brakecrafters - Tips & Info  I have one of their reverse bleeders
75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)