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91
If it’s the circular type then it’s screwed in. Just replace the top and bottom ‘O’ rings.

92
Aircooled RD Tech Help 250cc and Above / Re: RD400 disc replacement and availability
« Last post by tore on January 30, 2023, 12:51:15 PM »
Hvccycle is US has replacement disks
https://hvccycle.net/brake-rotors/

Skickat från min Nokia XR20 via Tapatalk

93
Aircooled RD Tech Help 250cc and Above / Re: RD400 disc replacement and availability
« Last post by pidjones on January 30, 2023, 11:59:56 AM »
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.
94
The Piston Broke / Re: Latest registered UK aircooled 250/400
« Last post by alanski on January 30, 2023, 10:47:49 AM »
When I worked at the salvage and sales shop we also had a load of ex Chas Mortimer racing school RD400's we broke for parts and in 1985 we had 8 of the original 1983 31K RD350ypvs which were ex pro-am series race bikes direct from Yamaha all refurbished by them we sold as new bikes on B plates and came with a years Yamaha warranty!! Also a little trivia relating to those ex pro-am series bikes is that they handled better than the standard tank slapper early 31k models due to they all had the headstock angle adjusted before racing to solve slapping by another Man I worked for who Motolined jig frames straight after accidents and was asked by Yamaha to do them as they were uncrated before being prepped for the series.
95
Aircooled RD Tech Help 250cc and Above / Re: Spark Plugs
« Last post by 5port on January 30, 2023, 10:34:52 AM »
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   
96
Aircooled RD Tech Help 250cc and Above / Re: Spark Plugs
« Last post by c50 on January 30, 2023, 09:38:10 AM »
This is up there with motor oil discussions or octane! I had no idea
;D :D ;D

True it seems! I had no experience of the plug paranoia though. but even back then there were completely groundless conspiracy theories 😀 Another was the complete crap about the having to remove the baffle wadding after run in 🤣
97
Aircooled RD Tech Help 250cc and Above / Re: Spark Plugs
« Last post by CBM on January 30, 2023, 03:58:28 AM »
This is up there with motor oil discussions or octane! I had no idea
;D :D ;D
98
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.

Hi, the earlier models like mine have a circular reservoir which isn't held by screws. I wasn't sure whether it is pressed in, screwed in, or bonded somehow but now I've been told they screw into the master cylinder body, I'll check that out. I suspect I'll end up with a new master cylinder at the end of the day but I'd like to keep the original if I can sort this leak. I am also unsure whether some replacement master cylinders are better than others, hence the original question
99
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.
100
Thanks Astute Greaser

I asked the question on the over 250cc zone and someone measured his DS7/R5 parts and the arms were same length so it looks like the arms may all be the same despite different part numbers   
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