Author Topic: CB750k4 stock resto (Read 17669 times)

JimM68 · « **Reply #50 on:** January 10, 2012, 04:23:37 AM »

Progress is being made. Sorry, no fresh pictures. Frame is all cleaned and was dropped off at the powder coater yasterday (Monday) morning. along with the swingarm, both stands, motor plates, and battery box and tool tray. They say it will be done Friday, for $300.

I'm gonna ditch out of work this afternoon, it's supposed to be in the fifties (in Chicago in January! WTF!!! But Ii'll take it, oh yea) Gonna roll the motor out in the driveway and finished cleaning that lump and get it ready for paint.

Did some internet shopping last night. Got 2 cans of por15 Chassis coat on the way. I'm gonna try some zinc plating. I found a "science shop" where I ordered ammonium Chloride and Zinc chloride powders, got a few pounds of zinc bars coming from ebay. I all ready own a 5 gallon bucket, will pickup a fishtank heater, and rig a power supply. I use muriatic acid for the pool, will use that for cleaning. I'll take pics and let you know how it works out.

Got kinda bummed when I couldn't find gas tank emblems. Not available? Really?
Mine are complete and in one peice, but are ratty looking, not helped by some PO trying to touch up the black and doing a lousy job.
Gas tank and sidecover emblems, can they be bought new?
Or can someone link me to a thread on restoring mine?
These emblems "make" the whole bike... They gotta look good.

Back to the engine paint... The third time I did my Camaro engine, I used por15 top coated with por15 semigloss engine paint, all brushed on. This stuff has worn like iron, it's still perfect after 5 years. But using a brush only really works on rough cast, it doesn't flow out good enough on smooth surfaces (true of chassis black too, while regular por15 smooths like glass on anything.) If they make a paint that was a match for the silver I'd use it in a heartbeat. But the stuff is so expensive I ain't gonna be the guinea pig.

Anything in a spray can still worries me. A good catylized urethane in the touchup gun will take care of business nicely. But what to buy? What will match? and take the heat?

If anyone ready has a left chrome fork ear, I need it.
Ditto for a throttle push cable.

K5owner · « **Reply #51 on:** January 10, 2012, 09:13:23 AM »

If you're looking for a new left fork ear (#51606-341-701XW); try David Silver Spares or CMSNL.com . Used ones are available, but typically they're not in good condition.

I didn't know which cover emblems you're referring to so here's some info on both.

The "750" emblems and the "Diamond" emblems appear to still be available. The diamond ones are only available in RED, stock was GOLD. If you really want the gold ones; I think Yamiya has them. He sells on eBay.

Use this link or any other that sells OEM parts. I would call them to verify their catalog is update, and the listed parts are available.
http://www.cyclepartsnation.com/pages/OemParts?aribrand=HOM#/Honda/CB750K4_A__MOTORCYCLE%2c_JPN%2c_VIN%23_CB750-2300001/OIL_TANK_%2b_TANK_%26_BATTERY_COVER/CB750K4-JPN-A/2Y143413F14341314A

Painting the cases... hmmmm. well, you'll get varied opinions, so here's mine. The original honda color is Cloud Silver (NLA). I used Duplicolor Silver Caliper Paint w/Ceramic (500degF). Goes on well and matches the stock color.

I might have a left ear - not sure the condition (need to dig them out) and I have a new set of RED diamond emblems. PM if you're interested.

Thanks,
Ray

K5owner · « **Reply #52 on:** January 10, 2012, 09:31:19 AM »

Just found these on eBay.

New- Left Fork Ear (73, 74 & 75 K's have the same ears)
http://www.ebay.com/itm/1973-Honda-CB750K-Head-Light-Ear-Fork-Cover-NOS-/330667210382?hash=item4cfd4d368e&item=330667210382&pt=Motorcycles_Parts_Accessories&vxp=mtr

New Gold Emblems
http://www.ebay.com/itm/HONDA-CB750-K2-K6-OIL-TANK-BATTERY-COVER-EMBLEM-T063-/140666082564?hash=item20c05a1504&item=140666082564&pt=Motorcycles_Parts_Accessories&vxp=mtr

New Red Emblems
http://www.ebay.com/itm/New-Honda-Factory-CB750-Side-Cover-Emblems-1971-1976-/280802426134?hash=item416120fd16&item=280802426134&pt=Motorcycles_Parts_Accessories&vxp=mtr

New 750 Emblem
http://www.ebay.com/itm/Honda-NOS-CB750-Side-Cover-Emblem-Set-750-K3-K4-K5-76-/220927220211?hash=item337049d9f3&item=220927220211&pt=Motorcycles_Parts_Accessories&vxp=mtr

JimM68 · « **Reply #53 on:** January 10, 2012, 11:45:02 AM »

Dayum K5, u r awesome. I was trolling around ebay after I saw your first post, came up empty, came back here, saw your second, and snagged the sidecover 750 and orange triangle emblems. Cool.

Now I just need those tank emblems. And we'll see about the fork ear (check the one u have?). I'll have quite a list for one of the big stores, but it's nice to get some of the unobtanium scored.

Need a rear fender too.

Thanks again, this site rocks!

K5owner · « **Reply #54 on:** January 10, 2012, 02:20:11 PM »

I'll find the ears tomorrow, take some pics and PM you.

Here's a new rear fender. Looks right, but I would ask to make sure its part#80100-341-000 .
http://www.ebay.com/itm/Honda-Genuine-CB550-CB750-Rear-Fender-Nos-/320717112715?hash=item4aac3ac58b&item=320717112715&pt=Motorcycles_Parts_Accessories&vxp=mtr

JimM68 · « **Reply #55 on:** January 10, 2012, 03:13:09 PM »

So I did manage to get home by 4 and get the engine cleaned.
I had all ready worked it over with parts cleaner solvent.
Today I used laquer thinner.
Followed by original gunk engine bright.
409 (this cuts all the oily residue from the degreasers)
And then a very thorough hosing with very hot water.
And a good blow dry with compressed air.

Here's some pics. That furniture dolley makes a great engine stand btw.

Is it my imagination, or was the oil pan originally polished and clear xoated?

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JimM68 · « **Reply #56 on:** January 10, 2012, 03:15:21 PM »

So I'll hopefully have the frame back Friday...
I needa get busy.

Any suggestions on a way to hold the frame with engine, or should I just chill till I can do forks front tire and centerstand?

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K5owner · « **Reply #57 on:** January 10, 2012, 04:01:09 PM »

Engine is looking good!

I bought a Harbor Freight motorcycle lift for about $140 . I put pads on the lift, and held it down with the provided straps.

JimM68 · « **Reply #58 on:** January 10, 2012, 05:34:20 PM »

Hmmm..... I have an engine stand, wonder if that could be adapted somehow?
Dunno 'bout spending $140 on something I'll only use once. Maybe I can find one on craigslist?
hmmmm.....

Your bike looks good. nice n shiny. we'll be talking about the best way to put the black back into the alternator cover methinks.

K5owner · « **Reply #59 on:** January 11, 2012, 09:14:48 AM »

PM sent (parts)

JimM68 · « **Reply #60 on:** January 12, 2012, 03:54:04 PM »

Powdercoater was fast.
Stuff looks great too.
This could become addicting.

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JimM68 · « **Reply #61 on:** January 13, 2012, 08:18:38 PM »

LAst night I started tearing down the left fork tube, and today I went by the local Honda dealer to order some fork seals and misc parts.

Anyone interested this place has perhaps a dozen NOS right side covers. No lefts unfortunately, I could use one of those.

Where does one get new stickers / labels?
Ya know, "helmet holder" "don't modify my exhaust system", etc.
I need to replace all the stickers, someone must reproduce them?
looks like yamiya750 has them, but japan is far away.
Still looking for a chrome left fork ear?

K5owner · « **Reply #62 on:** January 14, 2012, 04:25:38 AM »

Left Battery Cover & some links to decals, stickers & labels.

Cover, Battery, Left, K3 (1973) - Same Part/# as 1974 (83600-341-701)
http://www.ebay.com/itm/Honda-CB750-K3-1973-Left-Side-Cover-Green-Logo-Badges-/320824547473?hash=item4ab2a21891&item=320824547473&pt=Motorcycles_Parts_Accessories&vxp=mtr

http://knkcycles.com/honda-cb750-decals.htm

http://kz900.com/decals/decals-honda.html

http://www.z1enterprises.com/Decal-Warning-Set-Honda-CB750K3K4-197374-2252.aspx

JimM68 · « **Reply #63 on:** January 14, 2012, 07:42:25 PM »

So today I built myself a zync plating machine, and plated a load of nuts and bolts.
Rathar than buy a cheesy lil eastwood setup for $80, or a pretty decent setup from caswell for $180, I did some internet searching, and built my own.
Most of what I used came from here: http://mgonitzke.net16.net/zinc_plating.html

First on the list was an acid bath. A 5 gallon bucket from Menards (with a tight fitting lid) and an old empty 1 gallon container that I drilled a bunch of holes in to make a "dipper" were the parts, The guy at the link says 30% acid solution, so I put 2 gallong of water and a gallon of hardware store muriatic acid in the green bucket.
This acid is nasty. I've used it to adjust the ph in the pool. You do not want to breath the vapors. If the container it's in leaks any vapor at all, it will rust out anything near it that is steel. A couple years ago, I had to throw away 2 big metal storage lockers, rusted away from an open gallon of acid!

15 minutes in the acid bath cleaned up the parts but good, removed all paint, rust, and general crud.

JimM68 · « **Reply #64 on:** January 14, 2012, 07:56:10 PM »

The other things needed are the electrolyte, and the zinc anodes.
I found the zinc on ebay, bought 5 pounds for $20.
The chemicals were a little harder. But I found this place http://www.carolina.com and they didn't mind selling to someone who isn't a science teacher. They did require a commercial shipping address, as this stuff is hazmat and cannot be shipped to a residence.

I bought 3 500 grams jars of Ammonium Chloride, and 1 500 gram jug of Zinc Chloride.

JimM68 · « **Reply #65 on:** January 14, 2012, 08:04:42 PM »

Time to build it. I used another 5 gallon bucket. I've read that the side toward the zinc tends to plate faster, so I hung 2 zinc blocks in the bucket.
I used 18 guage solid bell wire. Drilled a hole though the zinc blocks, ran the wire through and tisted it tight.
I drilled 2 11/64" holes near the top of the bucket, and ran some #8 screws through. Attached the wires from the zinc on the inside, attached a wire connecting the 2 together on the outside. Left one long, and connected my poritive lead from the power source there.

I had a peice of steel laying around, so I drilled some holes in it, bent the ends at 90 degrees, and attached it inside the bucket, running in between the 2 zinc anodes. I drilled holes down each side inside the bucket to hang the wires with my parts. The negative lead connects there.

JimM68 · « **Reply #66 on:** January 14, 2012, 08:12:15 PM »

So the procedure is:
Start with clean stuff, and dip it in the acid for 10 or 15 minutes.
The green pic is supposed to be a bunch of stuff bubbling in the acid.

The other pic is "before", the parts I started with, 40 year old Honda hardware.

JimM68 · « **Reply #67 on:** January 14, 2012, 08:18:37 PM »

So after 15 minutes, I rinsed my acidy parts off in the sink, then, wearing bubber glove, I twisted the 18 gauge wire around the parts, hanging 4 or 5 from each wire, then hanging them thru the holes I drilled in the metal plate.

Then it's time for some power. Ideally, an old fashioned 2 or 5 amp battery charger would worlk perfect. But I don't have an old one. My big automatic charger just lit the error light. Same with the battery tender, blinking red and no juice.

I tried directly hooking up the bike battery, But my clamp on DC ammeter showed it was pulling 75 Amps!!!

So I soldered some wires onto an 1157 tail light bulb that was laying around. I used both filiments, and the resistance of the bulb dropped the current to an ideal 2.56 amps. I connected my charger to keep the bike battery up, set the timer for an hour, and went in for dinner.

JimM68 · « **Reply #68 on:** January 14, 2012, 08:25:51 PM »

The stuff came out of the bucket covered with dark gray fuzzy stuff.
Some running water and a brush knocked that off quick.

The parts appeared dark gray, kinda like a dip galvanized lag bolt.

A few minutes on the buffer shined em right up.

I'm very happy with this setup. For about a hundred bucks, I can do some pretty big peices, and have enough stuff to pretty much last forever. Now I can keep the original hardware on everything I restore.
I can't wait to go after the rear brake stay, rod, springs and hardware for the kickstands, etc.

hoodellyhoo · « **Reply #69 on:** January 15, 2012, 07:57:23 AM »

Thanks for that excellent write-up!!!! I don't know if I'll ever go as far as doing my own plating but I may steal your idea for the acid bath for cleaning up parts.

JimM68 · « **Reply #70 on:** January 15, 2012, 06:07:51 PM »

When the parts come out of the acid they are raw steel. They start to flash rust as soon as they dry. They are also kinda ugly, though they are very clean.
If you use acid to clean parts, they need to be plated or primered immediately.

JimM68 · « **Reply #71 on:** January 16, 2012, 08:24:28 PM »

Spent some time in the shop tonight, got the rest of that load of hardware polished up, then tore down one of the forks.

I really need to get on making a list and ordering some parts.

Still need a good chrome left fork ear, and a rear fender.

JimM68 · « **Reply #72 on:** January 22, 2012, 08:38:58 AM »

It looks like I get to spend most of the day out in the shop with my baggies full of parts, and my buffer.... yea!

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seanbarney41 · « **Reply #73 on:** January 22, 2012, 08:43:15 AM »

Quote from: JimM68 on January 22, 2012, 08:38:58 AM

It looks like I get to spend most of the day out in the shop with my baggies full of parts, and my buffer.... yea!

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...make sure and crank up the jams...

JimM68 · « **Reply #74 on:** January 22, 2012, 08:51:01 AM »

Sirius xm snap radio, with homemade power supply, logictech amp, speaker, and syubwoofer, and antenna in the window, currently on nascar 90, sometimes on classic vinyl.

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Author Topic: CB750k4 stock resto (Read 17669 times)