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Re: 62 Chopped FL Rebuild

Posted: Mon Sep 25, 2017 12:42 am
by 2Loose
I need to find more aggressive front brake pads, if I can't, I need to learn how to modify the pads I have to be more aggressive. Ah ha, a future worthy project. Gee, I'm sure glad I do not have enough projects to keep me busy.... (somebody shoot me....)

Re: 62 Chopped FL Rebuild

Posted: Thu Sep 28, 2017 11:02 am
by budoka
i feel your pain man, i feel your pain. i'm just excited for you that you've got it down to those little things. don't let up now, only a few more things and you'll be spending quality time with it as often as you like.

take care,
-dan

Re: 62 Chopped FL Rebuild

Posted: Fri Sep 29, 2017 5:03 pm
by 2Loose
Meanwhile, I need to improve that front brake on the 62 pan, I had originally set up a rotor and caliper from an '85 Suzuki Madura motorcycle, fabbing adapters to my '62 FL front forks and star hub:
Image

Looking at a drilled rotor, something like this one, but having a difficult time finding the correct one to replace the Suzuki rotor that's on there now:
Image

And better, high perf pads:
Image

Thought I'd try the pads first, see how, if that improves the braking on the front end, then swap the disk and see how much difference that makes....
And not too expensive, fun to try stuff like this and evaluate it...
Aloha,
Willy

(Updated: posted different pix....)

Re: 62 Chopped FL Rebuild

Posted: Sat Sep 30, 2017 8:32 am
by budoka
yeah, i love changing stuff around to get everything just like i like it, too. that's what makes it "your" chopper.

be sure to let us know how they work, that could be real good info to have.

take care,
-dan

Re: 62 Chopped FL Rebuild

Posted: Sun Oct 01, 2017 3:52 pm
by 2Loose
Digging around some more, have not found anything on rotors for this setup, but looking at these brake pads:
Sintered metal pads...
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Kevlar pads:
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Be worth getting a pair of each and testing them out...

Re: 62 Chopped FL Rebuild

Posted: Sun Oct 01, 2017 5:50 pm
by Dusty-Dave
Another inch of rotor diameter would probably make more difference than any pad change. Generally Sintered are much better when hot not so great for everyday riding. Unless of course your everyday ride is on a race course or canyon carving.
Dusty

Re: 62 Chopped FL Rebuild

Posted: Mon Oct 02, 2017 2:52 pm
by 2Loose
Image
This disk and caliper I pulled off of a wrecked '85 Suzuki Madura GV700GLF motorcycle, rebuilt the caliper, and fabbed an adapter to fit it to the original '62 HD front wheel star hub, is 10-3/4" diameter. I have not been able to find a new drilled rotor to replace it, so am now thinking of drilling this one. Not a job I look forward to, but might have to in order to increase the "bite" of the pads on the disk. Am still looking online though, in hopes of finding something that will replace mine.

I had grabbed these as I liked how this smaller size looked on the front end of the panhead. Let me see what I can do with pads, and maybe drilling it, but you are correct, I may just have to go to a larger disk and remount the caliper, or even go to a more aggressive caliper with bigger pads as well, right not it is not really any better than the original '62 front brake drum, which was barely a "hill holder" !!

Re: 62 Chopped FL Rebuild

Posted: Mon Oct 02, 2017 4:24 pm
by Dusty-Dave
A smaller master cylinder would increase the mechanical advantage. What size you got now and what size ate the caliper pistons. If the master isn't the one that came with this caliper a mismatch could be the problem. Too large a master cylinder bore causes great feeling lever and very weak brakes. Too small makes it relay hard to get a full lever and incredibly touchy brakes. Once you know if the hydraulic advantage is right it's easier to decide what to change.
Dusty

Re: 62 Chopped FL Rebuild

Posted: Mon Oct 02, 2017 6:38 pm
by 2Loose
Great comment!
I don't know the mc size, it was one I had on the shelf from a previous project, will see if there's a way I can check out the piston size without having to pull it apart, but I will if I have to. I'm aware of smaller bore mc's give more travel to pressurize the system but do so with higher pressure. That may be part of the problem.

Another consideration, when evaluating the original system, is that the Madura mc had to actuate two calipers (twin disk setup), and I'm only using one, so a mc of half the original size should be appropriate, if I could find out what that was.

Re: 62 Chopped FL Rebuild

Posted: Mon Oct 02, 2017 10:15 pm
by Dusty-Dave
Here this should save you some math.
http://www.vintagebrake.com/mastercylinder.htm

Re: 62 Chopped FL Rebuild

Posted: Fri Oct 06, 2017 2:45 pm
by 2Loose
I'll try to figure mine out, interesting read, they do point out that the wheel diameter to disk rotor diameter also figures into it, I hadn't thought about that. 10" effective pad contact rotor diameter vs a 21" wheel, probably more like 24" at the road surface....
Heck of a mechanical advantage for the wheel vs the disk rotor....
And they point out that the mc to caliper ratio for a single piston caliper probably should be in the 14:1 to 12:1 range...
I received both my kevlar pads and my sintered metal pads, but have some other problems to address first before looking at that.

Re: 62 Chopped FL Rebuild

Posted: Mon Nov 13, 2017 8:14 pm
by 2Loose
I found this rotor online, it looks good, will put it and the new pads on and see if it's improved or not...
Image

Re: 62 Chopped FL Rebuild

Posted: Fri Nov 17, 2017 2:58 pm
by 2Loose
The '62 is sitting there just waiting for me to get on and ride....
I think it gets jealous every time I crank up the Dyna and ride away...
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Other projects and some family traveling have kept me away from this
bike's brake issues, but another issue has me thinking about the fuel
supply to the carb, and wondering if the carb is starving at the high end...

The last couple of runs I did with this bike, opening up the carb beyond
about half, or trying to go beyond about 50 mph, it would cut out and pop,
sounding like it just was running out of fuel....

My initial thought was that the high speed jet was plugged or otherwise
not functioning, and needed tuning or rebuilding, but then I wondered if the
fuel supply was just inadequate with the tank valve and the tubing and the
inline filter I'm using, possibly restricting the fuel flow to the carb....
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This fuel valve at the tank could be restrictive, it just acts weird
and doesn't seem to flow very well when I turn it on with an
empty fuel line....
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There could be restrictions in the old LInkert system that I still have on there....
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And I never seem to be able to get that air bubble out of this fuel filter....
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The line from the tank valve to the inline filter never seems to fill with fuel,
it always seems to be empty....
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The throttle cable setup opens all the way, so no problem with air flow....
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So, I ran some fuel flow tests....
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Disconnected at the bottom of the float bowl, and it ran 450 ml/minute...
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Then ran just through the inline filter and got 600 ml/minute...

I'm thinking I need to somehow measure what the fuel flow
is into the float bowl when the float is down and the inlet
needle is open....

Hmmmmmm......

Re: 62 Chopped FL Rebuild

Posted: Sat Nov 18, 2017 12:44 pm
by Dusty-Dave
If memory serves they are supposed to flow around a quart a minute but will run in normal use at most anything over a pint. if it passes the test you show either remove the float bowl drain plug or the whole bowl if it doesn't have a drain. Be sure to hold it level while flow testing if you have to remove it. I prefer to know for sure it works in place but the drain plugs cane and went seemingly at random.
Dusty

Re: 62 Chopped FL Rebuild

Posted: Sat Nov 18, 2017 1:29 pm
by 2Loose
As I was only getting about a pint per minute (450 ml/min.) before it goes through the float valve, I'd bet it's less than that at the float bowl! No wonders it feels starved when I get to higher load levels....
Yup, I'm convinced I need to improve that fuel supply....