The calipers on my Twin shock R65 are seized as are a spare pair I bought. Once the pistons are stuck, is there any way of freeing them or is it a case of throwing them all in the bin and buying a pair of brembos?
Seized R65 Ate calipers
- Thread starter Devon
- Start date
- Joined
- Jan 6, 2002
- Messages
- 12,651
- Reaction score
- 1,239
Could try inner and outer soak with plusgas ( or diesel ) , then carefully, use airline on bleed nipple to push pistons out.
David nimrods were seized in pretty badly when we sorted his bike out. The airline wouldn't budge the Pistons so I had to link them up to another master cylinder and managed to pump them out. It wasn't pretty though.
If you're going to scrap them anyway, try putting them in a slow cooker with a dilute solution of antifreeze - you should be able to pick up a slow cooker for nothing at a charity shop. Cooking in antifreeze will free up most corrosion and you have nothing to lose...
markjackson
Registered user
Hi Andy,
If the Brembos you would fit are the same as an '81 R100RS, I have the callipers (and the forks) that came on my R90S, now removed. They don't look too bad and worked terribly, so quite good for airhead brakes.
If the Brembos you would fit are the same as an '81 R100RS, I have the callipers (and the forks) that came on my R90S, now removed. They don't look too bad and worked terribly, so quite good for airhead brakes.
- Joined
- Jan 6, 2002
- Messages
- 12,651
- Reaction score
- 1,239
Lester wheels 
What model is the blue bike above?
What model is the blue bike above?
markjackson
Registered user
Lester wheels
The wheels are promised to a new home, allowing me to ride it in public
It left Berlin in November 1974 as a '75 model R90S. Judging by very limited detail (paint layers on the side panels, stamped with the name period of manufacture as the frame number indicates) it was Daytona orange.
The Lesters and fairing wings were a period thang, but at some point it got 'modernised' with bottom end, gearbox, air box, tank, forks, brakes, electronic tacho and some other minor bits from a 80/81 R100. The carbs were changed early this millennium and then it only did a couple of thousand miles in the last 10 years.
I rode it a bit then took it apart, unsure of how standard/useful/silly I wanted to rebuild it.
It is now almost back to standard, properly nice with a complete 90S engine (albeit a later number than the chassis) and nearly all the correct bits. The proper tank with sticky-up filler (and rest of the panels) are hopefully soon to be finished getting being painted Daytona Ginger, it has shiny new Dellorto Pumpers, and is looking rather more lovely.
I ended up with a pretty standard spec, and only minor changes to make it better suit me:
IKON shocks (damping has gone on the Boge ones)
Stiffer fork springs (I'm fat)
Boyer ignition (I'm lazy)
later main loom (It came with a 1980 loom in perfect condition)
Plenty o'stainless (Rust is bad)
K&N (in proper ally air box)
I still fear the brakes may be terrible, and have some old ally Grimeca (twin pot lockheed style) callipers in the garage, so intend to build up a second set of forks, with the (AMA bikes style) period mod of swinging mounts, rose jointed rods and bigger discs, to try for fun, but that's a longer term thing.
It started on saturday for the first time, so I'm nearly there
Last edited:
PMed you regarding the RS calipers.
Ahh, the silver ATE calipers that were only used on the R45/65 from 1979 to 81. They are bastards to free. I left a pair in a solution of Freeway (hard to find in the UK) that my neighbour gave me, he works for British airways engineering so i could afford to waste 2 litres.
Left them a week and when i checked they'd freed off.
using a Hairdryerer to aply a littel heat and a screw driver between disc and Pad try pushing them in then pumping you might find that will work I have had mine siez a few times and that has all ways work its from sitting in a cold damp garage 
