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CB750F2 .... silk purse from a sows ear.
Moorey:
I clean off the rust and use old oil. Warm the steel and the oil and it does get under the bracket and into the rolled edges of mudguards hang it up let it drain and give it a wipe and do it once a year.
SumpMagnet:
Yep...that double skinned brace area was where they all go, not just the Honda ones. You see the upper chrome layer go wrinkly, then crack and flake. Poke it and you can see the tyre.
Good ideas on getting something in there to keep the air/moisture out. I will do that before I wrap it up and put it away for fitting later. Need to send the forks off for chroming and get new seals, dustcaps and clips and get some satin black for the leg lowers. Oh...and some new head bearings. Then the front end is done.
Then I got to strip, clean and paint the swingarm and centrestand. Not sure about the swingarm bushes they feel OK....so will probably leave them.
SumpMagnet:
No stopping me now ....well...not with those brakes anyway!
Figured I would make a start on the brakes as I need to get the calipers cleaned up ready for paint and I wanted to see what state thigns were in. As the bike arrived last summer, the brakes simply did not work. They were broke.
Popped the top on the master cylinder, and the rubber etc was all pretty good. Unlike the brake fluid. I say fluid...it was JELLY! I have never seen brake fluid do this, and to be honest....I never want to again.
A soak in fresh fluid and a lot of elbow grease cleaned it out, but I soon found out that the seals on the master cylinder were shot. Normally it's a breeze to pop out pistons just by pumping hte lever....but not here. Turned out there was another plug of sludge sitting in the caliper too. You can see it here where it oozed down once the piston was out...
Other than that, there was not much wrong here. The hoses and seals will all be changed for the simple reason of safety, but the pads were noi more than 50% gone, the sliding pins all did...and there was even grease in there! Small trasce of corrosion inside the caliper, but nothing that won't clean up. Dust seals were good and doing there job and the pistons was spotless.
Should all clean up nicely....
SumpMagnet:
God knows I should have known ... but a 'simple' job on an old bike just never really ends up being simple.
But...I had a bit of spare time this afternoon, so I thought I would strip down the front master cylinder. I have saved a bit of cash up, and will be ordering a rebuild kit for same, some bits for the front calipers, and the seals/clips for the forks. At some point, I will send the stantions off for rechroming, as I prefer that to buying pattern. Philpotts have done an excellent job on fork legs for me before, and I have seen some pretty thin chrome on pattern replacements in the past.
So...just whip the thang apart, then tidy up the shed as it's got damn messy over the winter... and then I can put my feet up.
Read the book ...and dug out the circlip pliers.
So...step one : Carefully prise out the rubber dust seal.
Nah....it's goosed. Split and crumbly. So it gets ripped out in pieces. Chucked in the bin. There is going to be one in the rebuild kit anyway, which will be fitted when I put it all back together.
Step 2: Remove the circlip that holds the piston in place.
Out with the circlip pliers, which will not fit in the space around the piston. Great. Figure if I push the piston down, it might let me get in there. Carefully clamp the thing in the vice with rags and bits of wood to protect the ally, and push down with a piece of dowel. Which promptly snaps. The piston springs up and squirts a little residual brake fluid in my face just to remind me whose boss here. Out with the angle grinder..... no....not in revenge. A little light modification to the circlip pliers and they fit in where I need them to, and out comes a circlip with a light dusting of gunge, rust, and stuff. Stuff being the technical term I am applying to the jelly the old brake fluid appears to have turned into.
Step 3: Remove the plain washer and slide the piston out.
You wot! The plain washer apprars glued in place, and the piston will slide in and out...but won't actually COME out at all. Whatever black arts were employed to place it there, I have yet to learn the counter spell to have it come out.
Does it just pull out?
Is there something else holding it?
I have studied the parts and the diagrams like a Buddhist priest looking for enlightenment...but in the end, I have just dumped a slug of WD40 in there and left it to soak.
As far as I can see, there is a pair of rubber seals, which fit on the piston, and the piston is held in place by the plain washer....which in turn is locked in by the circlip. So it should be clip out...and the piston ought to have popped loose under pressure from the spring. Hmmmm.
hairygit:
The washer may well have rusted, or electolytically fused itself to the alloy of the master cylinder. If it's rusted, try applying heat to the outside area of the cylinder, being alloy it may expand faster than the steel and loosen it's grip. The easiest option if that doesn't work is one of DSS replica cylinders.
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