Author Topic: Early Sandcast Found...... (Read 100950 times)

Alan F. · « **Reply #650 on:** March 13, 2022, 10:25:45 AM »

It's usually caused by silicone particle contamination, there was a video (that I can't find) at the Ferrari plant showing a test they'd perform with the painters before they'd let them near the paint room. It involved brushing your hands through your hair and over your clothes to release loose particles of silicone from shampoo or deodorant type products onto a piece of sheet metal. They'd paint the piece afterward then bake it for a few minutes. If the paint fish-eyed they wouldn't let you paint.

There are other causes of fish-eye but with the quality of your work I doubt surface prep is the issue.

I suppose DOT5 brake fluid could be an issue too, it might be hard to clean off?

BenelliSEI · « **Reply #651 on:** March 13, 2022, 11:25:46 AM »

I’m pretty sure it’s brake fluid in the “pores” of the part. Once it’s dried for a few days, I will sand it down and try a light dusting of sealer primer first...... very frustrating!

seanbarney41 · « **Reply #652 on:** March 13, 2022, 06:49:30 PM »

Aluminum is particularly difficult because it is porous...had problems myself this weekend with a unicorn top triple clamp. Maybe try baking or other preheating before cleaning and paint?

Terry in Australia · « **Reply #653 on:** March 13, 2022, 11:58:34 PM »

Brake master cylinders are a pain to paint, and are destined for eventual failure anyway as brake fluid (dot 4 or silicon dot 5) will lift fresh paint quicker than you can spray it on. We all know that they're anodized from the factory but it's hard to get used MC's re-anodized here at least because anodizing places fear tank contamination from used parts, so maybe the best method for recoating an MC (and calipers) is to have them powdercoated?

BenelliSEI · « **Reply #654 on:** March 14, 2022, 07:10:07 AM »

Quote from: Terry in Australia on March 13, 2022, 11:58:34 PM

Brake master cylinders are a pain to paint, and are destined for eventual failure anyway as brake fluid (dot 4 or silicon dot 5) will lift fresh paint quicker than you can spray it on. We all know that they're anodized from the factory but it's hard to get used MC's re-anodized here at least because anodizing places fear tank contamination from used parts, so maybe the best method for recoating an MC (and calipers) is to have them powdercoated?

Terry..... I’ve never tried powder coat. Worried about all the threaded holes and lever gap. Usually just a quick touch of black lacquer..... This is not the first time, but I usually get them. This one has been exceptionally crappy. I’m still using DOT3. What are you using in the cb750s?

BenelliSEI · « **Reply #655 on:** March 14, 2022, 07:19:33 AM »

Quote from: seanbarney41 on March 13, 2022, 06:49:30 PM

Aluminum is particularly difficult because it is porous...had problems myself this weekend with a unicorn top triple clamp. Maybe try baking or other preheating before cleaning and paint?

Good idea. I usually toss the part in the dishwasher for a Cycle too, but this one missed out.

PeWe · « **Reply #656 on:** March 14, 2022, 07:34:28 AM »

2k paint will withstand DOT 4, right?
DOT 5 does not attack the paint.

BenelliSEI · « **Reply #657 on:** March 14, 2022, 07:55:21 AM »

Quote from: PeWe on March 14, 2022, 07:34:28 AM

2k paint will withstand DOT 4, right?
DOT 5 does not attack the paint.

Per...... Do you use DOT 5? I’ve got freshly rebuilt master, caliper, and new hoses and metal line. Now would be the time to try something different?

PeWe · « **Reply #658 on:** March 14, 2022, 08:40:25 AM »

No, old style DOT 4.
But when all is clean and new, DOT 5 silicone can be an alternative.
The caliper will hopefully work without a leak beside the piston

Others that have tried it might testify.

Don R · « **Reply #659 on:** March 14, 2022, 09:11:34 AM »

I used silicone fluid in my street rod. It always had a soft pedal until it sat and warmed up. Once the motor got warm the brake was good all day. The M/C was under the floor maybe that had something to do with it. I bled gallons of it through. L0L. That's why I didn't try in in a bike.
After going to regular fluid, it worked fine. These days it has a corvette M/C, still under the floor.

BenelliSEI · « **Reply #660 on:** March 14, 2022, 02:48:15 PM »

Got lucky today. Scuffed off the ugly spots and blew on some sealer primer. Added two coats of black and it cleaned up nicely. Not perfect, but I’m done messing with it!

BenelliSEI · « **Reply #661 on:** March 14, 2022, 05:47:41 PM »

Wasted some time cleaning out the oil tank. No surprises, bit of crud in the bottom, but not as much as I usually find. Helps confirm the low mileage (17,628) on the speedometer.

Don R · « **Reply #662 on:** March 14, 2022, 10:32:19 PM »

I've been known to use a piece of copper tube and a shop vac to suck the crud out of the oil tank. A little brake clean helps and so far, I haven't turned my shop vac into a jet engine.
Mythbusters couldn't get one to light up with gasoline so I figured I might get away with it.

BenelliSEI · « **Reply #663 on:** March 15, 2022, 05:11:18 AM »

Quote from: Don R on March 14, 2022, 10:32:19 PM

I've been known to use a piece of copper tube and a shop vac to suck the crud out of the oil tank. A little brake clean helps and so far, I haven't turned my shop vac into a jet engine.
Mythbusters couldn't get one to light up with gasoline so I figured I might get away with it.

I take the brush off the hose in my cleaning tank. If I get th hose right in the bottom and let it flush for 20-30 minutes it gets surprisingly clean.

BenelliSEI · « **Reply #664 on:** March 15, 2022, 08:05:18 AM »

Early, short chain guard. Soon replaced by a longer one that kept oil from spraying all over the back of the bike (somewhat)? I will seal off the engine oil chain lubricator, for sure.

BenelliSEI · « **Reply #665 on:** March 15, 2022, 08:06:58 AM »

Master cylinder fully restored and back where it belongs!

MauiK3 · « **Reply #666 on:** March 15, 2022, 08:14:18 AM »

Beautiful.
Your shop area is spotless. I'm envious.
My "back half of the garage" area is used for everything, our endless home improvement projects, bike work, wood work, sometimes my brides painting, etc. It never looks that clean but it's fairly tidy and packed with tools etc.
The center has the table saw with various tools on wheeled platforms like a small band saw, planer, drill press, sander, miter saw, etc.

BenelliSEI · « **Reply #667 on:** March 15, 2022, 08:46:02 AM »

Quote from: MauiK3 on March 15, 2022, 08:14:18 AM

Beautiful.
Your shop area is spotless. I'm envious.
My "back half of the garage" area is used for everything, our endless home improvement projects, bike work, wood work, sometimes my brides painting, etc. It never looks that clean but it's fairly tidy and packed with tools etc.
The center has the table saw with various tools on wheeled platforms like a small band saw, planer, drill press, sander, miter saw, etc.

Been there! When we sold our home in Toronto, I built the shop by adding down the side of an existing building. Next, we added a large two car garage to the house. Great projects, each took me an entire Summer. Nothing (and nobody) gets in the shop, unless I want it (them) in there.

MauiK3 · « **Reply #668 on:** March 15, 2022, 03:03:14 PM »

I’m always policing what gets placed in my work area. I always find stuff that I unceremoniously remove to somewhere else.

BenelliSEI · « **Reply #669 on:** March 15, 2022, 03:56:34 PM »

Determined to do a little bit each day. Tested, cleaned and mounted the original coils, with new NGK caps. One of the “T” mounting brackets was broken in half, but I had a set of replacements Vintagecb750.com now sells. Perfect fit and shiny!

BenelliSEI · « **Reply #670 on:** March 15, 2022, 06:01:26 PM »

It never ceases to amaze me how many parts we can now buy NEW. Today I dismantled the early seat latch, and on a whim, did a “search”. Sure enough......

Resisted the urge to spend (stupid) money. So far I’ve binned a damaged turn signals body, a fender stay, ripped foot peg rubbers, and any rusted fasteners. I am determined to refurbish everything that I can, original to this bike.

RAFster122s · « **Reply #671 on:** March 15, 2022, 06:49:42 PM »

varsol, wow...been years since AI have seen that...Dad used to use it quite a bit. We used it to strip wax from the wood floors in the house I grew up in...
Mom waxed and buffed them...paste wax and it was Johnson &Johnson yellow can...
On her hands and knees.
You wouldn't believe the condition of the pine wood floors in the home we moved into back in 65 ish or 66ish timeframe... I was 3-4 years old and my little sister wasn't even a twinkle in Dad's eye yet...
The wooden floors were covered with carpet and pad for over probably 15 years or more and then bit by bit the carpet went away with time.

Bike looks fantastic John!

Powder coating would be my choice. If it fails contact member PowderMan, he can do a superb job for you and he's a MCist so he knows how to do it right and can give you the Sheen you need to look close to original with durability of Powdercoating.

Larry on CX500 forums has a source for hard anodizing the black aluminum control housings of the Hondas giving original looks a d highly durable. I can give you his info if you want it to find his source here in US, it is likely a local shop in Sacramento California area would be my guess. Larry does fabulous work and is the CX forum's counterpart to our HondaMan, Mark Paris...

BenelliSEI · « **Reply #672 on:** March 15, 2022, 08:19:13 PM »

Thanks, but the master cylinder is done and mounted. I’ve had good luck with the paint, OK for now.

WideAWAKE · « **Reply #673 on:** March 15, 2022, 08:32:19 PM »

Just spray it with a 2K paint and you won’t have any issues with oil/brake fluid or gas.

Lots of stuff available in a can now.

Ps. Bike looks great.

BenelliSEI · « **Reply #674 on:** March 16, 2022, 01:21:14 PM »

Started picking away at electrical. Parts of the main harness are missing, cut up, and brittle. Going to buy a new one. Regulator and rectifier cleaned up well and are going right back. The starter solenoid is missing, but turns out I have a good one. The single fuse holder is gone, was running unfused! Will correct. Boring, plodding jobs ahead......

Weird photo. Looks like rust where the top engine mount meets the frame. Went back to look. All black paint. Strange.

News:

Author Topic: Early Sandcast Found...... (Read 100950 times)