Author Topic: 1975 CB750 Build! "Kona" - Sold and gone. (Read 71428 times)

Ravie · « **Reply #25 on:** July 09, 2014, 08:05:01 PM »

Thoughts on the friction discs? the motor has 26k on it...

I went out with the intent of getting the more complete bike torn down as far as I could. I really wanted the engine out tonight.

But that didn't happen.

I had a hard time getting the forks out (but was finally successful). Played around with what ideas I had to get the motor out. None of my friends found themselves able (or willing) to come help, so i decided I needed to get the fork and swingarm off. (the forks were horrible.)

I finally got it all town down to just the frame, and now I find it impossible to get the engine out.

I was tired and stressed and frustrated which is usually a good point to walk away. So I did.

As she sits....

goldarrow · « **Reply #26 on:** July 09, 2014, 09:21:48 PM »

If your local friends won't help removing the motor, we cyber friends will. Many here have done it one man show including myself. You'll need to remove oil filter if havens done so. I'm going to be pulling my 75 750F soon too! Just to fix the rubber pucks leaks

SOHC4 Cafe Racer Fan · « **Reply #27 on:** July 09, 2014, 11:16:58 PM »

Remove the filter. Then flip the whole package on its side, pull the engine mount bolts, and bingo.

Ravie · « **Reply #28 on:** July 10, 2014, 04:42:26 AM »

Yeah, I've done all that. The oil pan and oil filter are off. No dice. It's getting stock on the back side.

Ravie · « **Reply #29 on:** July 10, 2014, 10:10:08 AM »

Yeah. I got it out of the first frame and figured the second would be easier.. I was wrong! Haha
I'm sure little Japanese techs slid them in in seconds... Bastards... Haha

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Ravie · « **Reply #30 on:** July 10, 2014, 02:32:00 PM »

It's out.

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goldarrow · « **Reply #31 on:** July 10, 2014, 02:33:11 PM »

Beautiful. Now let the fun begins

Ravie · « **Reply #32 on:** July 10, 2014, 02:58:48 PM »

Yes sir! I think I'm gonna take it outside and hit it with a hose before I even start disassembly. I'll shove some rags in the intake/exhaust holes.

I'm going to bring my frame and tank into work tomorrow to see if I can get a guy to help me shorten the tank to fit. I may even take some parts to hit in the sandblaster at work (brackets n stuff). I need to get a set of JIS drivers.

Ravie · « **Reply #33 on:** July 10, 2014, 07:45:49 PM »

Dumbest question ever: Are the throttles on CB750's "push-pull" with two cables?

I know, i JUST took that apart but...a lot of nuts and bolts have passed through my ratchet this week...

Trying to build a cart to budget and I just couldn't remember. Since I'm doing new bars I'm going to get the throttle assembly with the grips. Just need to know if I need a single or a double.

Thanks guys!

SOHC4 Cafe Racer Fan · « **Reply #34 on:** July 10, 2014, 08:32:50 PM »

Quote from: Ravie on July 10, 2014, 02:32:00 PM

It's out.

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Deceptively heavy, isn't it?

Ravie · « **Reply #35 on:** July 10, 2014, 09:00:36 PM »

Quote from: CB750 Cafe Racer Fan on July 10, 2014, 08:32:50 PM

Quote from: Ravie on July 10, 2014, 02:32:00 PM
It's out.

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Deceptively heavy, isn't it?

You ain't foolin. Gotta get a buddy to help get it on the rebuild bench.

edwardmorris · « **Reply #36 on:** July 11, 2014, 02:28:22 AM »

If you haven't already, grab a copy of Mark Paris/Hondaman's book before you tear into the engine, highly recommended

Ravie · « **Reply #37 on:** July 11, 2014, 06:35:31 AM »

Quote from: edwardmorris on July 11, 2014, 02:28:22 AM

If you haven't already, grab a copy of Mark Paris/Hondaman's book before you tear into the engine, highly recommended

No disrespect intended to him(seriously), but it looked to me when I did some poking around as though that book costs 100 dollars? That's the most ridiculous book price I think I've ever seen. At that price I will probably never buy it. That's a lot of parts. Bob Helt wrote a similar style book about the Corvair which I purchased a few years ago. I think it was 35 bucks.

If I'm mistaken about that I apologize. That's just what I saw.

Roach Carver · « **Reply #38 on:** July 11, 2014, 06:45:56 AM »

Its a good book written by a well respected member here. the cost is related to the limited audience. Theres not a million of us cb750 guys out there. Its also filled with color photos and detailed info. It goes on sale every so often. I would recommend it but hey, no worries either way.

Ravie · « **Reply #39 on:** July 11, 2014, 08:44:00 AM »

Quote from: roach carver on July 11, 2014, 06:45:56 AM

Its a good book written by a well respected member here. the cost is related to the limited audience. Theres not a million of us cb750 guys out there. Its also filled with color photos and detailed info. It goes on sale every so often. I would recommend it but hey, no worries either way.

I understand that. I really do. 100$ is just a lot of dough. Especially for a guy attempting to build with a limited budget.

It's not about being pound foolish. It's about not having pockets lined with cash. I understand fully that it's a GREAT item. But it's still a pretty penny.

Anyway, I'm not trying to beat the guy up. I know the knowledge in it is indispensable. We'll see. I'd like to have it, for sure.

Sure be great if there were a cheaper PDF version! :-)

edwardmorris · « **Reply #40 on:** July 11, 2014, 08:50:38 AM »

Its alright, I was in a similar boat when I started last year, but I am extremely glad that I bought it and was just sharing what I learned. There is enough collective knowledge on these forums to help you through an entire build, but a physical copy with over 40+ years of first hand knowledge in front of you, as you're wrenching away, is no match for a PDF or having the forum open on a device in the shop. Just my 2c of course, good luck with your project, having the engine out on the bench was one of my most fun moments with the project.

seanbarney41 · « **Reply #41 on:** July 11, 2014, 10:37:58 AM »

Quote from: Ravie on July 11, 2014, 08:44:00 AM

Quote from: roach carver on July 11, 2014, 06:45:56 AM
Its a good book written by a well respected member here. the cost is related to the limited audience. Theres not a million of us cb750 guys out there. Its also filled with color photos and detailed info. It goes on sale every so often. I would recommend it but hey, no worries either way.

I understand that. I really do. 100$ is just a lot of dough. Especially for a guy attempting to build with a limited budget.

It's not about being pound foolish. It's about not having pockets lined with cash. I understand fully that it's a GREAT item. But it's still a pretty penny.

In that case I cannot recommend that you try rebuilding one of these engines. You will spend well over $100 on gaskets. Just try to find a used, good condition engine instead. You are gonna need a lot of expensive parts just to take it apart and put it back together again and it is unlikely that you will get it right without as many reference sources as possible. These are not small block chevy's.

Ravie · « **Reply #42 on:** July 11, 2014, 10:52:36 AM »

Ravie · « **Reply #43 on:** July 11, 2014, 08:08:35 PM »

In doing a lot of reading and thinking, I think I've decided what I want to do is a more mild rebuild. Pull the pistons from the wrist pins while they're still in the crank, do a medium grit hone on the cylinders (if they're not too far out of spec), new rings, obviously new gaskets, etc..

As cheap as clutch friction rings are I feel like...if it's not too terribly huge of a job, I'm going to change them and put some new EBC springs in. I'll still do a rebuild on the carbs, etc. Just won't crack the case and do bearings and things.

I was looking at the replacement face gauges from the ad over that way ---> and they're all greenish with red overlimit sections. The ones that came off of my bike Have Blue backgrounds with White overlimit sections. Are mine normal and that's just the way they repro them?

Ravie · « **Reply #44 on:** July 12, 2014, 01:30:32 PM »

The ingredients for a fiberglass seat form. Excited!

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Ravie · « **Reply #45 on:** July 14, 2014, 03:24:44 PM »

Yay! Now I can start engine tear down!

Started blasting my tank today. Going in early for other parts tomorrow. Making progress!

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Ravie · « **Reply #46 on:** July 16, 2014, 06:42:18 AM »

Has anyone that has used the por-15 fuel tank sealer NOT used their metal prep zinc/phosphorous etch liquid?

I plan to use this to seal my tank.

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Ravie · « **Reply #47 on:** July 17, 2014, 06:56:29 AM »

Got a bunch of smaller parts blasted here at work in my off the clock spare time. Started painting them last nigt. Got the oil tank, battery and tool cradle and electronics bracket sprayed. I used rustoleum flat black. Looks good. I'll get pics at some point. I need to get the top end of the engine torn down so I can bring it to the media blaster with the frame and swingarm.

Does anyone offer an engine screw kit? If not I was thinking I may buy a couple sets and offer them up for other 750 guys all pre packaged and labeled as to their respective spots. Just an idea I had.

Definitely going with the por-15 motorcycle fuel tank kit. Gotta modify the mounting bracket on my cx500 tank first.

I have to find a solution to my side covers. I'm not going to run one on the oil tank side but ill need one for the left side and I think both of mine are ruined beyond repair. Maybe I can make a small form from the old one and make my own.

Need to get myself a spoke wrench so I can disassemble my wheels.

Really enjoying this build. Why did it take me so long to get a motorcycle?!

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Ravie · « **Reply #48 on:** July 17, 2014, 08:56:17 AM »

Haha, yeah I'm on my mobile and didn't search. I see dcc has a kit too. Same price and Allen head as well...

I'll look for info on those covers, thanks.

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greenjeans · « **Reply #49 on:** July 17, 2014, 01:44:42 PM »

I'll second frankenstuff's side covers. I have 3 sets of them.

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Author Topic: 1975 CB750 Build! "Kona" - Sold and gone. (Read 71428 times)