Author Topic: 1976 CB750K Stock/Cafe Hybrid (Read 36340 times)

heyjones · « **Reply #25 on:** April 20, 2010, 11:38:00 PM »

I've gotten a little carried away with the caliper paint. It turned out so good on the brake caliper that I used it on the headlight bucket, sidecovers, rear brake drum, front brake sensor, handlebar controls... I've been using the combination of Duplicolor Self-Etching Primer (DAP 1690) and Caliper Paint (BCP102). It proved to be a little thick for the controls, painting in the lettering isn't going too well. I'm not sure how this paint is going to hold up over time, but for now it looks pretty killer! I also got the frame back from powder coating, they skipped the lower triple tree the first time around but once I get that back I'm going to install the tapered bearings, then work on getting the front and rear reassembled. Then it's on to the engine while I get the wiring hooked back up. Oh, and I also replaced the brake lines with the stuff at http://slingshot-cycles.com.

For the front flashers, I dig the early 750 style signals that attached directly to the headlight, so I picked up new "ears" and some dual element blinkers. I also got the shorter stems for a tighter look. I'm pretty pleased with them so far.

Here you can kind of see how the controls turned out. I also ordered a pair of Randakk grips (http://www.randakks.com/Grips.htm), they've gotten really great reviews and they feel like they should be pretty cozy. I repainted the master cylinder, I haven't rebuilt it since the brakes actually worked pretty well before I tore the bike down. I kept the original cap, I like the way it looks especially compared to the cheap plastic replacements.

So yeah, that's the latest on my project. I'm hoping to really start picking up steam this weekend, I'm aiming to go on a trip next month. If I don't have it going by then, I think I can have my cousin's '82 CB900F going by then.

rickmoore24 · « **Reply #26 on:** April 21, 2010, 10:01:58 AM »

Looking great! So stoked you have your side covers. I didn't have any and my funds were depleated for my project so I ended up getting a maier replacement pos for the left side. The fit of them really SUCKS! Keep up the good work.

heyjones · « **Reply #27 on:** April 22, 2010, 03:01:02 PM »

Anybody have any experience with this CycleX piston kit (scroll down about 2/5):

http://www.cyclexchange.net/Engine%20Parts%20Page%20Pistons.htm

For $169 it seems like a great deal!

heyjones · « **Reply #28 on:** April 26, 2010, 12:49:23 PM »

Opening up the top end today, trying to follow Hondaman's book so I don't screw anything up. The oil looks pretty dark and cruddy, is this a sign of bad things to come?

SKTP · « **Reply #29 on:** April 26, 2010, 01:42:44 PM »

The caliper paints looks amazing. Thanks for listing what you used...

heyjones · « **Reply #30 on:** April 26, 2010, 01:49:30 PM »

No problem, I'll let you know how it holds up once I actually get this thing running. I'm about to remove the cam shaft, my goal is to get the pistons and cylinders into the machine shop either today or tomorrow. It's be really nice to have this in one piece in a month... is that completely unrealistic?

heyjones · « **Reply #31 on:** April 26, 2010, 02:17:15 PM »

Okay, so I'm having some trouble getting the cam towers off. According to everything I've read, these should just pop off at this point... but they won't budge. Is it safe to tap them lightly with a mallet to try and loosen them up, or is there some other way to get these off?

SKTP · « **Reply #32 on:** April 26, 2010, 02:40:27 PM »

I'm just about to get to the point that you are at with your engine. How do you have your engine propped up? I am thinkign of bulding a temporary 2x4 front support? What did you do?

heyjones · « **Reply #33 on:** April 26, 2010, 02:44:34 PM »

Ha, this is pretty embarrassing... here's a photo of my "workbench"...

I've only got a car port here, this seems like the best option at this point. Is it safe to take a hairdryer to these cam towers, maybe try to loosen the bond with some heat?

ksmith0034 · « **Reply #34 on:** April 26, 2010, 05:14:25 PM »

Quote from: heyjones on April 26, 2010, 02:44:34 PM

Ha, this is pretty embarrassing... here's a photo of my "workbench"...

I've only got a car port here, this seems like the best option at this point. Is it safe to take a hairdryer to these cam towers, maybe try to loosen the bond with some heat?

You're right, that is pretty embarrassing.

But at least you are working on it! Nice job so far.

HondaMan · « **Reply #35 on:** April 26, 2010, 06:06:24 PM »

Just tap them upward with a rubber mallet. Someone may have added too much sealant to the rubber pucks underneath, or there might be some old, crusty oil stuck around the studs at the bearing caps, holding it down.

heyjones · « **Reply #36 on:** April 26, 2010, 08:02:56 PM »

Thanks HM, they popped right of with a couple of taps! While I was waiting to hear back on that, I figured I'd start putting my carbs back together... then this happened:

Any idea on how to get the bottom half of this jet out? I might attempt to use a screw extractor on it if I have a bit that's small enough. Worst case scenario I guess I've gotta find a replacement!

wannabridin · « **Reply #37 on:** April 26, 2010, 08:12:16 PM »

i think i might just have an extra float bowl if you don't want to mess around with that. shoot me a PM and i'll get you a price with shipping if you'd like! don't worry, won't be much, just some for shipping and to cover a few bucks... they're from 75 or 76 i believe, so lemme know! i'll get you a pic

heyjones · « **Reply #38 on:** April 26, 2010, 08:14:32 PM »

It's not in the bowl, unfortunately. It's broken off in the actual carb body. So if I can't get it out, I would need to replace the entire carb. Ugh! Thanks for the offer though.

cb750k77 · « **Reply #39 on:** April 26, 2010, 08:30:57 PM »

what model carbs you got?

heyjones · « **Reply #40 on:** April 26, 2010, 08:33:38 PM »

They're the stock Keihin carbs for a 1976 CB750K. I feel like if I had a screw extractor small enough I could pull it out, I'm just not sure if anybody's ever had any luck doing that.

heyjones · « **Reply #41 on:** April 26, 2010, 08:46:39 PM »

Crisis averted. I found another thread on this topic:

http://forums.sohc4.net/index.php?topic=59368.0

I just took a small finish nail, nailed it in enough to grip then twisted it out with a pair of pliers. So I've gotta just order another jet to replace it. Whew!

heyjones · « **Reply #42 on:** April 27, 2010, 01:08:14 PM »

Got up this morning to get the cylinder and pistons out to examine and take them to the machine shop.

A lot of carbon build up on the pistons and all over the engine, really. I think I'm going to go two sizes over and pick up the 1.0mm over stock pistons from Z1:

http://www.z1enterprises.com/detail.aspx?ID=4075

I'm having a lot of trouble getting the wristpins out of the pistons. I've removed the circlips, but either way I try to drive them out they won't go. I've managed to get one about half way out with a wood dowel rod and a mallet, but it's not going any further. Am I missing a step here or something?

As far as the valves go, should I pick up a valve compressor and pull these out while I'm at it? I've decided against getting into the bottom end of the engine, so I figure I should do whatever I can in the top end while I've got it apart.

SKTP · « **Reply #43 on:** April 27, 2010, 01:40:09 PM »

nice progress...I hope to catch up this weekend

heyjones · « **Reply #44 on:** April 29, 2010, 12:29:16 AM »

I go the pistons out. Had some trouble with a couple of the wrist pins, just sprayed with some PB Blaster and hit them with the hair dryer for a bit to loosen everything up and drove them out with a mallet and an oak dowel. I ordered the new two over pistons from Z1, I think they're in the mail now. As soon as they get in I'm taking them to Fain's Machine Shop up here in Ventura to have the cylinders bored and to see if my valves need to be lapped. One question: do I have to get into the bottom end of this thing to replace the cam chain?

KB02 · « **Reply #45 on:** April 30, 2010, 04:29:08 AM »

You've got two options for the cam chain:
#1.) Open up the bottom end and take it off the crank.
#2.) Get a chain rivet tool and take a apart a link of not only the old one, but the new one as well, so you can fish it down around the crank sprocket.

For my money, I'd open up the bottom end.

andy750 · « **Reply #46 on:** April 30, 2010, 04:45:07 AM »

Impressive work and especially considering your work bench!

If you need more jets to replace the broken one let me know and Ill send you a couple. I have a few #40s.

Good luck
Andy

heyjones · « **Reply #47 on:** May 02, 2010, 10:21:43 PM »

Finally got my triple tree lower back from powder coating, so I busted out my All Balls tapered steering bearing kit, got the bearings greased up and started to drive the lower bearing onto the triple tree. I'm having a hell of a time getting that thing on. I've used every tip I could find here and it's not going anywhere. I know these things are a tight fit, and it looks like they powder coated all the way down to the base of this thing.

I'm wondering if I'll have to try and bang this thing off and remove the powder coating so it will fit, or is there some way I can drive this thing on without doing that? I was really hoping to have this thing back on its wheels this weekend!

KB02 · « **Reply #48 on:** May 03, 2010, 04:36:27 AM »

Quote from: heyjones on May 02, 2010, 10:21:43 PM

I'm wondering if I'll have to try and bang this thing off and remove the powder coating so it will fit...

That is exactly what you will have to do.

heyjones · « **Reply #49 on:** May 03, 2010, 08:27:21 AM »

Aaargh! What's the best way to remove the powder coating?

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Author Topic: 1976 CB750K Stock/Cafe Hybrid (Read 36340 times)