Disc runout ETZ251 ('89 original)

[Puffs]

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[Blurredman]

Interesting.

And you say you cannot see any alignment marks?

[Puffs]

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[AlanJ]

Hi Puffs, I had a similar problem with my Saxon 301 when a Co powder coated my frnt wheel, they sprayed over the mating surface of the disc. I got it sorted by having the surface skimmed on a drop bed lathe, cost me a tenner. I did think of a solution before the skim but not before the paint people had a bloody go with a file which made it worse. Anyway have a look in the mechanic's posts under Disc Brakes in my name, it's all in there. An idea I thought of to get the paint off the mating surfaces is an electric soldering iron sharpened like a chisel or heat up an old chisel.
Wish you well Alan.

[Puffs]

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[AlanJ]

Hi Puffs, Yes, you are right, it's the deflection of the seals with and without pressure that moves the piston and hence the pads off of the disc. Incidently the frnt wheel still had it's tyre on when I had the disc mounting skimmed. Still on the lathe, after the skim we bolted on the disc and dial checked the runout and it was 0.05. Everything is really great with that brake now. That is on the Saxon 301 but I wish that the frnt hub brake on my TS 250/1 was a lot better, infact it was one of the reasons why I bought the Saxon. Anyway Puffs wish you well with the disc. Alan.

[DAVID THOMPSON]

do mark the disk and hub on the 4cycle bikes i had this problem on my 2002 rt125
way too much wobble after a disk removal and reinstall
had to try it with a dial Gage several times before it seemed correct
had disk off to change tires and wheel bearings and had a mess getting it sorted
oem wheel bearings were really nasty at 10,000 miles which was part of the problem
DAVE