AIRCOOLEDRDCLUB FORUM

If it’s the circular type then it’s screwed in. Just replace the top and bottom ‘O’ rings.

My rescued RD400c came with new drilled aftermarket disks, but I haven't a clue to their origin. No calipers came with it, but aftermarket clones are working well. I believe the disks may have been slightly over-thick as it was a bit of a squeeze to get them in, but no drag once the calipers were adjusted (on was slightly cocked due to casting error). And Yes, these are plenty of brakes for a non-raced RD, even with 200lbs of rider aboard.

I had a shocking experience with my later CDI RD250E in '79.  Riding up to the highlands of Scotland, I stopped to refresh my legs and hands in pouring rain (for the previous 100 miles!).  My riding gloves were soaked through and freezing cold so, I sat on the idling bike and stuck my wet gloved hands under the tank onto the tops of the cylinderheads.  Well, the poor electrical insulation showed itself straight away as 50,000 volt pulses shot up one arm, across my chest and down the other arm at 2,000 shocks per minute. I had a bit of trouble getting my arms out, but somehow I did it without falling over with the bike and the engine kept idling happily.  Mind you, I didn't feel very happy, but it took my mind off the bloody cold wet hands for the rest of the journey.
I have got a feeling that I had removed the metal shields off those plug caps, but there was a proven HT path there.  Never missed a beat in the wet though.
Cheers

5port   

This is up there with motor oil discussions or octane! I had no idea

Sounds similar to my 250C which had a slight weep. Reservoir is held in place by 2 screws - once removed the reservoir pulls off to allow access to the O Ring. I purchased a replacement from Yambits and have had no problems since.