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Lets build a SOHC for less than a grand
Erny:
Graham, isn't this somehow automatically "solved" once new pads are worn enough (first 100-150 miles)?
Odoslané z SM-G930F pomocou Tapatalku
Trigger:
It is hard to explain without getting too technical .
The first thing is why all these sites on a double disc are advising you pack the top pivot arm out with washers?. I have tried this and the caliper is not parallel to the disc.
The second concern is the left factory one has 0.50mm gap nearest the fork and sits flush at the front of the caliper touching the disc . I find this correct as when the disc is spinning the brake pad touches the disc at the front and it will drag to bed in.
The right hand caliper is touching at the back ( nearest the fork leg) and has a gap at the front. If you put a cylinder of metal in a lathe and spin it anti clockwise you can use a cutting tool if it is straight, angle the tool down and it will drag and still cut but, if you angle the tool up to cut in to a cylinder, that tool will start to judder and may snag and break.
So....what I am finding is that I need to skim a little bit of metal off of the caliper mount on the fork or, shave some metal off of the pivot arm mounts :-\ :-\ :-\ Which on all these web sites, no one has advised to do.
Oggie400F:
--- Quote from: Trigger on January 26, 2020, 11:37:40 PM ---Spent a few hours today trying to get the calipers to sit flat to the disc. A little hard as I have a tiny lip on the disc and after all my efforts I still had the right caliper toeing out by 0.65 top and 0.70 at the bottom. Had a measure up of the left caliper and that was not sitting flat to the disc.
I am not sure now how flat these should sit to the disc.
(Attachment Link)
--- End quote ---
Interesting discovery on the measurements for the left Caliper.
I’m going to check mine to see what they are like. I’m still waiting on parts for the twin disc upgrade on my bike and am watching yours with interest.
Great info Trigger. This is really going to help me.
Just one thing I’ve noticed is that the Caliper adjusting pin extends beyond the fork attachment lug on the picture. Is this standard length or extended as I note that the locking nut is fitted inside to enable the spring to be compressed adequately?
Erny:
OK, now I see!
I did not "read" your drawing properly...
Just thinking, maybe this issue does not exist on CB750 dual disk setup?
Trigger:
--- Quote from: Oggie400F on January 27, 2020, 12:29:44 PM ---
--- Quote from: Trigger on January 26, 2020, 11:37:40 PM ---Spent a few hours today trying to get the calipers to sit flat to the disc. A little hard as I have a tiny lip on the disc and after all my efforts I still had the right caliper toeing out by 0.65 top and 0.70 at the bottom. Had a measure up of the left caliper and that was not sitting flat to the disc.
I am not sure now how flat these should sit to the disc.
(Attachment Link)
--- End quote ---
Interesting discovery on the measurements for the left Caliper.
I’m going to check mine to see what they are like. I’m still waiting on parts for the twin disc upgrade on my bike and am watching yours with interest.
Great info Trigger. This is really going to help me.
Just one thing I’ve noticed is that the Caliper adjusting pin extends beyond the fork attachment lug on the picture. Is this standard length or extended as I note that the locking nut is fitted inside to enable the spring to be compressed adequately?
--- End quote ---
I just put the nut next to the spring to pack it out while I waited for a longer spring to arrive, 45mm long at the correct spec. As this is not a original build, I just use a countersunk M6 machine screw as adjustment screws.
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