Looking along a long straight road amidst lush green farmland


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Ren - The Ed¹ said :-
Blimey look how clean that front end is already. I would never admit it but I rather envy your patience and time and "can do" approach Glyn, but I won't. Instead I'll say "if it's that damn clean you won't want to get it dirty when it's done" or something equally typically horrid. I can't help myself.

30/10/2023 22:15:36 UTC
Glyn said :-
A further round of work has taken place. The Suzuki master cylinder was revisited after reading Ian's post and looking at the link. The GSXR cylinder is only 14mm whilst the BM unit is 20mm. No real choice here so I bought an after market 20mm unit because the BMW part is mega money. However,that has forced me to plan to change the switch controls as the BM units are part of the lever assemblies. The used wheel arrived and is running true so I've replaced all the disc bobbins and sprayed the wheel. I'm now waiting for the paint to harden before getting the tyres replaced with some Heidenhaue road knobblies that I bought. I've also started to modify the top yoke to take the GSXR ignition switch as the BM unit is faulty and no longer available.
Posted Image

04/11/2023 16:37:07 UTC
Upt'North ¹ said :-
Glyn, never heard of anyone changing out the bobbins. I'm guessing for most bikes new discs are cheap enough just to replace. Tell us how you did it fella, do they press in and how do you get the old ones out without inflicting fatal wounds on the disc hub.

05/11/2023 09:18:42 UTC
Ian Soady¹ said :-
Bobbins on my Commando floating disc were held by circlips on the back face.

05/11/2023 11:20:23 UTC
Glyn said :-
Yes, no real difficulty to change the bobbins apart from the fact they're £4.38 each and there are 24 of them on the front wheel. They fit with circlips on the back over spring washers. The old ones were shot allowing the disc to rotate by about .5mm and move up and down by 1mm. There's no discernible movement now. I've seen new discs at over £400 so new bobbins were the way to go as the disc thickness was about 4.8mm on both sides. I've been fitting the Suzuki GSXR ignition switch and right hand control assembly. The mounting spigot on the top yoke had to be bored out and shortened but worked fine in the end apart from the steering lock not being able to be used as it faces forward instead of backwards.
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05/11/2023 19:16:52 UTC
Upt'North ¹ said :-
Thanks Glyn, everyday's a school day for sure.
Ta Teach.

05/11/2023 23:11:39 UTC
Ren - The Ed¹ said :-
Cor blimey! Excellent work Glyn. I'm learning stuff like - bobbins can be replaced? And I'm enjoying the posts. Thank you :)

06/11/2023 07:59:15 UTC
Ian Soady¹ said :-
I've never used steering locks on bikes. One of the attempted thefts (see above) of my bikes was a Honda NX650 Dominator stolen from outside the house. I'd left it chained and with the steering lock on. Before realising it was chained the dopy thief smashed the steering lock.

I thought little more of it till I rode the bike out of the drive when the steering locked up and I was almost on my ear. The remains of the lock had jammed in the abutment.

Steering locks on bikes (and for that matter cars) are little more than ornaments.

06/11/2023 12:01:51 UTC
nab301 said :-
Ren - The Ed¹ said :-
- bobbins can be replaced?

Ren they're not like the factory "riveted " bobbins on mainly Japanese bikes .
My Bimmer has a slightly different set up to Glyns Bmw , mine being semi floating with bobbins on the mounting bolts . On the ABS models the L/H disc was separated from the alloy wheel by the ABS ring but the R/H disc floated directly on the alloy disc mounting posts , not a great idea over time .

07/11/2023 17:49:16 UTC
Ren - The Ed¹ said :-
Yes I'm only familiar with the riveted bobbins, not this fancy Germanic stuff. Although as you state having the disc float against the alloy posts might not be considered the wisest of options. No only is ally soft but one that wears away you're looking at a new wheel not just a new disc and centre. Genius.

As for steering locks - yeah they're pants and I'll use a disc lock 99% of the time.

08/11/2023 13:33:00 UTC
Glyn said :-
I've bought this rather lovely Lucas MCH61 headlamp bowl for the project at a bike jumble. There's some work required to make it work but I'm going to be fitting an electronic speedometer in the large hole. My question (aimed probably at Ian) is what goes on/in the Y shaped hole above it? I think it was probably for an ammeter as the light and ignition switches of the day fitted through a 1/2" hole. I obviously need something to go in the hole so if anyone can identify what it was and where to get it I'd be most grateful.
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15/11/2023 16:19:29 UTC
Upt'North ¹ said :-
Just so I look stupid.
The run switch? Key? Thingymabob? I seem to remember a black plastic switch thingy.
But yes Ian will know.

15/11/2023 17:22:22 UTC
ROD¹ said :-
Yes, I also think it is a space for a switch.
I also think it is a LU60818 unit used on the MZ TS250?

15/11/2023 19:27:39 UTC
ROD¹ said :-


15/11/2023 19:44:51 UTC
Ian Soady¹ said :-
That does look like it - definitely not a British bike fitment though.

16/11/2023 10:59:43 UTC
Upt'North ¹ said :-
Rod, I'd never have said MZ, I just remember their gorky headlights.
Good catch.

16/11/2023 11:00:11 UTC
ROD¹ said :-
A further look on the internet shows it is an ignition switch. The switch and keys seem to be readily available, but the chrome cover a bit more difficult to find.

16/11/2023 11:08:03 UTC
ROD¹ said :-


16/11/2023 16:25:34 UTC
Glyn said :-
Thank you Gents. Oddly enough I went to Feked ( a Brit bike parts supplier just around the corner) where I bought the rim. He found an MZ picture with that bowl although he thought it unlikely that Lucas would make a one off for MZ. He also found lots of similar bowls with an ammeter on the top. I'm not sure how I'm going to fill those holes now as it's quite shallow when the lamp unit is inside. I'd like to put the temp guage there but that won't be easy. I went to some trouble to fit the Suzuki ignition switch and so don't want to go that route on the headlamp.

16/11/2023 18:58:11 UTC
ROD¹ said :-
Just a suggestion.
Why not fit the chrome cover and fit a warning light of some description in that?

16/11/2023 19:17:48 UTC

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