Author Topic: Matt's CB750 K4 Full Blown Restoration - Frame Painted (Read 15362 times)

matt s · « **Reply #25 on:** June 28, 2012, 11:39:27 am »

Thanks for the input, Mark.

The one-by-one bearing shell measurement sounds like a good strategy to me. One question, though - if I only have one pair of the black bearings in the case do I leave my current worn bearings in the other 4 positions that are not being measured? I assume you didn't just have the other 4 slots empty, right?

Also, I'm a bit confused on what you did with your case at the machine shop. You put the case together so he could measure the wear of the crank bearing seats? Is this a normal practice in rebuilding the engine?

-Matt

nancy · « **Reply #26 on:** June 28, 2012, 09:55:42 pm »

Hi Matt

Leave all the bearings in place and remove just the set you are replacing with new. You must have the whole lot in situ as you torque it back down..and DON"T let the crank move! Have top case upside down on your right - fit crank into that, place plastigage (green) onto the journal with the new shells, place bottom case gently on top, front face first, screw in bolts in prescribed sequence - biggest 2 first, centres then outers. Everything in the shell cavity areas must be TOTALLY clean and dry. Bolts, dowels, cover faces - needed liberal oil to simulate proper seating for torque etc.

My machinist offered to eyeball the crank and take quick measurements - so having the cases joined was easy for him - I didn't stay to watch him...but he told me he can access the bearing seats inside the case from the crank hole - inserts his tool and measures and takes comparitive measurements on the crank journals. This told him that my no 1 crank journal was worn most - but still inside spec. My plastigage was exactly what he measured. It was just his way of checking that I wasn't a total idiot and that the new shells would not bind on the crank..by checking for out of roundness for me - on the crank..in particular the conrod journals.

matt s · « **Reply #27 on:** June 29, 2012, 08:20:36 pm »

Thanks for the clarification, Mark. That sounds like a good strategy to me.

Update: Cases are completely stripped of everything (except rods which I will keep) and ready for cleaning, paint stripping, prep, and paint. I think I'm going to do that before I do the bearings so I can save up a bit of cash for those expensive bits.

Potential Problem. I found what looks to me to be like pretty bad wear on the shift drum. I noted some sloppy shifting for the short test drive I took with this bike and this may be part of the reason. Is this thing trashed? The groove with the problem is the one closest to the outside of the case.

So, is a replacement necessary?

Other pics:

Oil screen with some nice chunks embedded

Top case ready for cleaning

Bottom case is real nasty - hopefully this won't be too difficult to clean up

Parts bagged up and, um, "organized"

Tews19 · « **Reply #28 on:** June 29, 2012, 08:30:51 pm »

I need to grow a pair to tare into an engine. Keep it up

Stev-o · « **Reply #29 on:** October 11, 2013, 05:42:50 am »

Update?

nancy · « **Reply #30 on:** October 12, 2013, 05:14:38 pm »

Yeh,...what's happening???

matt s · « **Reply #31 on:** December 29, 2016, 07:28:28 pm »

I'm back!

After over four years, I'm making time for this bike again. I've moved homes, sold my 350F, got into woodworking, ran a couple marathons, but now its CB750F time again! The bike was moved from my previous home to this home but is still in pieces on the same shelf.

Last I was working on this I was cleaning the engine case to prep for painting. I think I'm going to take it over to my buddy's house and use his blast cabinet and hit it with some type of media. Is soda best to blast the engine case with?

I also think I'm going to work on getting a rolling frame. That means stripping the paint from the frame, swingarm, etc., and re-painting. Then getting the forks rebuilt. Speaking of forks:

Started tearing them down. I'll need to replace the fork tubes and seals and stuff. They were full of some NASTY smelling black sludge. Also, I wasn't able to get the little allen bolt out of the bottom yet. From what I read it's going to be a pain.

I'm also going to get into the swingarm a bit to prep for paint. I think I'll need to wait to paint for summer but just getting ready for now.

Here's my engine case as it sits now. Its about ready to paint, too, but I'm going to give it a final blast before priming and painting.

Happy to be back on the wagon!

MauiK3 · « **Reply #32 on:** January 05, 2017, 08:14:14 am »

Matt
GREAT job on posting your progress. I am about to start a K3 mostly stock restoration. Your detailed progress has been most helpful. As for media blasting, be careful. It's almost impossible to clean all the nooks out and any media left in it will total the engine quickly. I think the safest might be soda blasting as it dissolves with water. Do you plan to put stock pipes on it?

matt s · « **Reply #33 on:** April 08, 2017, 10:55:11 am »

Painted parts ready to go to the sand blaster

matt s · « **Reply #34 on:** April 10, 2017, 07:13:01 am »

Quote from: MauiK3 on January 05, 2017, 08:14:14 am

Matt
GREAT job on posting your progress. I am about to start a K3 mostly stock restoration. Your detailed progress has been most helpful. As for media blasting, be careful. It's almost impossible to clean all the nooks out and any media left in it will total the engine quickly. I think the safest might be soda blasting as it dissolves with water. Do you plan to put stock pipes on it?

Thanks, Maui. I was planning on using soda on the engine cases because of the dangers of getting glass or sand into the oil paths. Also, I think I'm going to go with MAC 4-2 pipes. I just can't justify shelling out the big bucks for 4-4 stockers. Are you posting progress on your restore?

matt s · « **Reply #35 on:** April 12, 2017, 08:43:30 pm »

Got the rear hub all taken apart.

And actually came up with a handy way to remove the rear brake shoes. In Hondaman's book he says a fan belt spreader would be a good help - but I don't have all those fancy tools. So I just spread the shoes with the chain adjuster like in the picture below. Just spread the shoes and lift them off.

palepainter · « **Reply #36 on:** April 12, 2017, 09:03:58 pm »

Genius move right there!

matt s · « **Reply #37 on:** April 15, 2017, 12:54:16 pm »

Got the tires and spokes off the rear wheel.

Is there too much rust on my rim to salvage it?

Also got my forks all taken apart ready to rebuild (sorry for upside-down picture). Forks are trash - have new ones on the way from nichecycle.com.

This bolt on the bottom of the forks was a beeotch to remove!

matt s · « **Reply #38 on:** April 18, 2017, 08:10:29 pm »

Got my frame and other pieces back from the media blaster!

Stev-o · « **Reply #39 on:** April 21, 2017, 07:25:45 am »

Nice....powdercoat now?

HondaMan · « **Reply #40 on:** April 22, 2017, 06:58:10 pm »

Quote from: Stev-o on May 28, 2012, 04:27:13 pm

Thanks for the offer of the seat, but no thanks. Had one just like it when I bought my K7, first thing I did was toss it in the trash!

If you ever yearn for it again, I have a spare here for you!

HondaMan · « **Reply #41 on:** April 22, 2017, 07:05:17 pm »

Quote from: matt s on June 29, 2012, 08:20:36 pm

Thanks for the clarification, Mark. That sounds like a good strategy to me.

Update: Cases are completely stripped of everything (except rods which I will keep) and ready for cleaning, paint stripping, prep, and paint. I think I'm going to do that before I do the bearings so I can save up a bit of cash for those expensive bits.

Potential Problem. I found what looks to me to be like pretty bad wear on the shift drum. I noted some sloppy shifting for the short test drive I took with this bike and this may be part of the reason. Is this thing trashed? The groove with the problem is the one closest to the outside of the case.

So, is a replacement necessary?

Other pics:

Oil screen with some nice chunks embedded

Top case ready for cleaning

Bottom case is real nasty - hopefully this won't be too difficult to clean up

Parts bagged up and, um, "organized"

Yes, that needs to be replaced. Also check the "L" shifter fork, make sure the shift-follower dowel that runs in the groove is in good shape and the fork tips not burned. Do you have my book? It details all that stuff...

MauiK3 · « **Reply #42 on:** April 25, 2017, 09:34:31 pm »

Matt
I am poking along, gathering parts and refining the strategy. I have a few woodworking projects to do and then it comes apart. I will be ordering all of Hondaman's electrical goodies. So far I've gathered wheel bearings, tank, side covers and fork covers in the right color, 4-4 exhaust, tires (Continental, from Revzilla), fork kit, rear fender, and various other bits, lots more to get. I think I will use POR15 on the frame with their top coat. Why? It's repairable and my wife wants to help me clean and paint the frame, it's not in bad shape. Yes, she's excited about the project, how did I get so lucky?
Hondamans book is a must, takes a lot of the mystery out of it. Also, watch Dean Segovia's Hack a week rebuild. I don't agree with everything he did but it's very informative for the visual learner.
A little story:. I replaced the rear winkers including the mounting clip with the wire riveted to it. Right away I had a shaker ground on both. Long story short, I drilled the river heads off, paint under the ring terminal. I cleaned up the paint, tapped the hole 8-32, made a short screw and reinstalled with silicone grease. Problem solved.
By the way, the motor scene here is largely V twin, off road, scooters and some Tupperware bikes. When we ride around and park I always get someone walking up with starry eyes to look at it ( and I'm not fond of flake sunrise). Or, a younger person walks up and wants to know what it is👍

Aloha all from Maui

matt s · « **Reply #43 on:** April 30, 2017, 08:00:54 am »

Quote from: Stev-o on April 21, 2017, 07:25:45 am

Nice....powdercoat now?

I'm going to paint it. I bought VHT roll bar paint and intend to paint all the black stuff with it. I also got some of the spray max clear coat which I'm planning to use on the frame and swingarm.

matt s · « **Reply #44 on:** April 30, 2017, 08:05:07 am »

Quote from: HondaMan on April 22, 2017, 07:05:17 pm

Yes, that needs to be replaced. Also check the "L" shifter fork, make sure the shift-follower dowel that runs in the groove is in good shape and the fork tips not burned. Do you have my book? It details all that stuff...

Thanks, Mark, I'll look for a replacement drum. I do have your book now (didn't back when I posted a few years ago) and it's never far from reach now.

Sent from my iPhone using Tapatalk

HondaMan · « **Reply #45 on:** May 02, 2017, 09:42:08 pm »

Quote from: matt s on April 12, 2017, 08:43:30 pm

Got the rear hub all taken apart.

And actually came up with a handy way to remove the rear brake shoes. In Hondaman's book he says a fan belt spreader would be a good help - but I don't have all those fancy tools. So I just spread the shoes with the chain adjuster like in the picture below. Just spread the shoes and lift them off.

Excellent move!
Can I put that in the next book, if I can find you to give you the credits?

HondaMan · « **Reply #46 on:** May 02, 2017, 09:45:15 pm »

Quote from: matt s on April 30, 2017, 08:05:07 am

Quote from: HondaMan on April 22, 2017, 07:05:17 pm

Yes, that needs to be replaced. Also check the "L" shifter fork, make sure the shift-follower dowel that runs in the groove is in good shape and the fork tips not burned. Do you have my book? It details all that stuff...

Thanks, Mark, I'll look for a replacement drum. I do have your book now (didn't back when I posted a few years ago) and it's never far from reach now.

Sent from my iPhone using Tapatalk

If you can't find a good drum, PM me. I have some partial engines, probably have a good one in them somewhere.

matt s · « **Reply #47 on:** May 06, 2017, 03:19:34 pm »

Quote from: HondaMan on May 02, 2017, 09:42:08 pm

Excellent move!
Can I put that in the next book, if I can find you to give you the credits?

Wow - it would be my privilege!

Quote from: HondaMan on May 02, 2017, 09:45:15 pm

If you can't find a good drum, PM me. I have some partial engines, probably have a good one in them somewhere.

Will do, thanks!

matt s · « **Reply #48 on:** May 06, 2017, 03:36:13 pm »

Got a few updates!

Got a few parts clean - it's nice not getting all grimy just trying to move parts around

Installed All Balls wheel bearings in front and back hubs

Cleaned up my rims. Sprayed rust converter primer on all the rust. It all turned black, hopefully it will hold up.

And... PAINTED MY FRAME! This got me pretty excited, I feel like this project is really happening now. I used VHT Roll Bar and Chassis Paint. To me it looks great. I used 5 cans to finish all these painted parts. They will hang in the garage for a week before I try to get things rolling.