Author Topic: 1975 CB750 Build! "Kona" - Sold and gone. (Read 71432 times)

Ravie · « **Reply #50 on:** July 17, 2014, 09:14:50 PM »

I looked them/him up earlier today. Awesome price and look great. I'll definitely be getting a set. Thanks for the recommendation there.

Started tearing down the engine today. I will be getting an impact driver tomorrow. Was hoping I could do it with the JIS drivers I bought...but some of those top cover screws...I'm pretty sure they've been there since 1975.

I'm so sorry I don't have fun pictures. I have a bunch of flat black engine parts and a sandblasted fuel tank... I'm in the process of removing the bracket on the CX tank so I can relocate it. After eyeing up the tank and bracket on the frame I came to the conclusion that the tank does not need to be modified, only the rear mounting bracket. So I'll cut it off and simply re-weld it further "up" the tank to line up with the stock mounting location.

After that It'll get sealed, then body work and paint can happen.

edwardmorris · « **Reply #51 on:** July 17, 2014, 10:04:23 PM »

Member ilbikes/Gordon here sells the best JIS tools and impact drivers, PM him and see if he has any left in stock, pricing for members is pretty generous.

Ravie · « **Reply #52 on:** July 18, 2014, 06:57:30 AM »

Yeah ill be doing Allen heads. I used my dremel for one yesterday...just cut a slot and used a flathead.

I need an impact driver anyway.

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Ravie · « **Reply #53 on:** July 19, 2014, 11:00:13 AM »

Best. Tool. Purchase. Ever.

Nice thing is, I got one if their little rewards card things before I bought our new bed set last march and had 14 bucks on it, so I walked out the door for 9 bucks ans change which is what the crappy HF one would have cost AND now I have one with a lifetime warranty.

It did a spectacular job with a number 3 bit. One screw broke in the cover but thankfully it was just a weak spot and after I got the valve cover off it was easy to unscrew with pliers. I was worried about the threads but it turned out fine.

Working on getting the rockers and cam off. I need to read the shop manual for the correct steps.

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Ravie · « **Reply #54 on:** July 20, 2014, 06:23:23 PM »

Been spending a lot of time going slow.

The Cam seems to be in spec, according to Hondaman (Mark would know, right?!). Looks pretty good so I'll run it.

Got the head and cylinder block off today. The cylinders are smooth as glass and I can tell the bike has sat on multiple occasions because there are two different rust rings in them. I pulled my hone and oil out and hit one of the cylinders just out of curiosity and even after a few seconds of honing, there are some definite ridges. (I didn't get a pic of this). I pulled off a piston and looked at it closely and both skirts are pretty well worn so I'm going to safely say it's time for a bore/hone up to the next size. I kinda figured that in the beginning with a 26k mile engine.

Random picture of a cleaned Valve cover in there... The pieces of engine I remove will be glass blasted.

The combustion/valve area of the heads were about as nasty/crusty as they could possibly be. I need to get ahold of the right valve spring compressor so I can take it apart. I'm planning on lapping the valves myself.

Any thought on valve springs? Checking heights, etc? After that many miles should I just replace them? I don't want to just willy nilly spend money but i also want to make sure I'm covering the important bases.

Ravie · « **Reply #55 on:** July 22, 2014, 10:19:47 AM »

I'm really toying with whether I should just go ahead and pull the whole engine apart. With the looks of the top end I can only imagine how worn the original bearings are. More expense but peace of mind and done "the right way"...

Hrmmmm.

Oh, and we came up with a name for the bike.

"Dark Roast"

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SOHC4 Cafe Racer Fan · « **Reply #56 on:** July 22, 2014, 11:21:15 AM »

Quote from: Ravie on July 22, 2014, 10:19:47 AM

I'm really toying with whether I should just go ahead and pull the whole engine apart. With the looks of the top end I can only imagine how worn the original bearings are. More expense but peace of mind and done "the right way"...

Hrmmmm.

Oh, and we came up with a name for the bike.

"Dark Roast"

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There are some that would say, if it ain't broke, don't fix it AND OTHERS that would say if you are going to invest so much in the upper half, why not make sure the bottom half doesn't have any lurking issues (peace of mind). Hey, it's only time and money!

On my 550 with 8K miles, I did not crack the crankcases, but gave the upper half a refresh of new caskets, inspected the valves, cam chain/chain tensioner. That motor was pretty clean and had been kept in running condition. For a previously seized motor, you may go deeper.

Ravie · « **Reply #57 on:** July 22, 2014, 11:26:26 AM »

Exactly my quandary!

Is the alternator (yes?) Area supposed to have oil in it? Looked like it did..

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edwardmorris · « **Reply #58 on:** July 22, 2014, 11:48:04 AM »

I don't know if it is supposed to be there, but mine also had some. I just cleaned it with a electronics cleaner spray from the local auto shop, good as new.

Your pacing seems adequate to get the whole engine redone quickly, so like Calj, I too, will suggest you at least inspect it and reuse what you can and replace the wearbles. This should give you a good rider for a while, but if you're planning to tear it down again to rebuild, say this winter, then stick with just the top end.

Ravie · « **Reply #59 on:** July 22, 2014, 12:13:31 PM »

No, cause I don't really want to have to tear it down again. Probably go slow. I haven't had a bike ever, so one more season won't kill me..

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Ravie · « **Reply #60 on:** July 22, 2014, 03:40:01 PM »

Hey, while I have your attn..

Anyone tell me what this little speaker lookin thing is?

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Tews19 · « **Reply #61 on:** July 22, 2014, 03:44:18 PM »

Quote from: Ravie on July 22, 2014, 03:40:01 PM

Hey, while I have your attn..

Anyone tell me what this little speaker lookin thing is?

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Come on now! Seriously that is a microphone! You can speak into it without being plugged into the bike and it will echo loudly!

Ravie · « **Reply #62 on:** July 22, 2014, 03:46:53 PM »

Quote from: Tews19 on July 22, 2014, 03:44:18 PM

Quote from: Ravie on July 22, 2014, 03:40:01 PM
Hey, while I have your attn..

Anyone tell me what this little speaker lookin thing is?

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Come on now! Seriously that is a microphone! You can speak into it without being plugged into the bike and it will echo loudly!

Hahahaha..

I would *almost* believe that.

First thought was it was some kind of speed warning sensor or something.

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Tews19 · « **Reply #63 on:** July 22, 2014, 03:50:19 PM »

Talk to it buddy. It will echo...

It's the turn signal buzzer

SOHC4 Cafe Racer Fan · « **Reply #64 on:** July 22, 2014, 04:01:57 PM »

Quote from: Ravie on July 22, 2014, 03:46:53 PM

Quote from: Tews19 on July 22, 2014, 03:44:18 PM
Quote from: Ravie on July 22, 2014, 03:40:01 PM
Hey, while I have your attn..

Anyone tell me what this little speaker lookin thing is?

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Come on now! Seriously that is a microphone! You can speak into it without being plugged into the bike and it will echo loudly!

Hahahaha..

I would *almost* believe that.

First thought was it was some kind of speed warning sensor or something.

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That's a fetzer valve. Get me some ball bearings and some three-in-one oil. Better make that Quaker State. (See Fletch)

Ravie · « **Reply #65 on:** July 22, 2014, 04:41:59 PM »

Turn sig buzzer! I can dig it. I fired it had to be some sort of warning device or something...

MikeKato · « **Reply #66 on:** July 22, 2014, 06:19:34 PM »

Quote from: Ravie on July 22, 2014, 04:41:59 PM

Turn sig buzzer! I can dig it. I fired it had to be some sort of warning device or something...

It's a good piece of equiptment,it helps keep people from turning in front of you because you forgot to turn off your directional.

seanbarney41 · « **Reply #67 on:** July 22, 2014, 06:28:36 PM »

Tews, ya big pushover...I was looking to keep it going a couple more posts

Ravie · « **Reply #68 on:** July 22, 2014, 07:47:41 PM »

Remember.... this ain't my first go round with a wrench. First bike yes, but plenty of years turning wrenches. That and a General Class Amateur Radio Operator and a very experienced musician. Hard to fool me with microphone jokes! haha

:-P

Got my rear tank mount fabbed up this evening. It's not pretty but it will function. Because I'm using that CX tank (or so I think from the looking 'round I've done") the mounts are all different. The front is too wide for the mounts (going to get some 1 1/2" half-cut pipe for the front and weld it in to extend them) and the rear bracket came out over the battery area, so I cut that sucker off. I'm going to weld a bolt (or two, haven't decided yet) to the bottom of the tank on the plate the bracket was originally welded to and make a bolt/wingut combo for the bottom for easy removal... It's essentially just a box shape made of 12 gauge plate steel with holes in it that I've bent to the correct height. I'll have rubber between the tank and the mount for flexibility. I made it just tall enough to keep the tank off the frame, and I plan to put some foam there on the sides/edges for extra support. I'll get pics when it's less ghetto looking.

Side note: A buddy of mine wants me to build the other frame I have for him. Only problem is the other frame didn't come with a title. So, I'm not sure how to go about that. Technically it is vintage, so I'm curious if we could just use a bill of sale and he could get a title that way with a motor vehicle VIN inspection. Kansas doesn't say much about that on their website, so it's clear as mud what I should do.

mrbreeze · « **Reply #69 on:** July 22, 2014, 11:03:22 PM »

Quote from: Ravie on July 22, 2014, 03:40:01 PM

Hey, while I have your attn..

Anyone tell me what this little speaker lookin thing is?

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Hey looky there!!! That didn't last one hour on my bike when I got it back in April 2000. When I was test riding it and first hit a turn signal......said to myself "Oh hell no!!!!". I got home and clipped it off and pitched it. Guess I shoulda kept it to sell . Seems there are folks out there that like them. I know it's safety & all or it's original equipment that came with the bike but not my cup of tea!

Ravie · « **Reply #70 on:** July 23, 2014, 06:50:35 AM »

Quote from: mrbreeze on July 22, 2014, 11:03:22 PM

Quote from: Ravie on July 22, 2014, 03:40:01 PM
Hey, while I have your attn..

Anyone tell me what this little speaker lookin thing is?

Sent from my HTC One V using Tapatalk
Hey looky there!!! That didn't last one hour on my bike when I got it back in April 2000. When I was test riding it and first hit a turn signal......said to myself "Oh hell no!!!!". I got home and clipped it off and pitched it. Guess I shoulda kept it to sell . Seems there are folks out there that like them. I know it's safety & all or it's original equipment that came with the bike but not my cup of tea!

I'll have to see what noise it makes before I decide. I could see myself being the kind of rider to leave my blinker on..

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mrbreeze · « **Reply #71 on:** July 23, 2014, 02:10:11 PM »

Yeah but when you go down the road beeping like that everyone around you knows you're that kinda rider!! I don't have anything against it.I just don't care for it personally.

Ravie · « **Reply #72 on:** July 23, 2014, 02:55:10 PM »

I can dig it.

Of to the garage to see if I can get the rest of the engine torn down tonight. Wish me loose bolts and clean knuckles.

Ravie · « **Reply #73 on:** July 23, 2014, 05:10:55 PM »

So, this happened..

Got the bearing numbers off the crank. All green from the factory. Yay for simplicity! I'll plastigauge to be sure.

I am not going to touch the transmission stuff. It looks good and I am certain I will F it up heartily. The rest I can handle. Primary chain actually looks really good.

Work work work!

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Ravie · « **Reply #74 on:** July 23, 2014, 06:18:42 PM »

Bearings are tighter than I was expecting.

I may leave the rods alone and just replace the crank bearings for peace of mind with stock (all green from factory)

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Author Topic: 1975 CB750 Build! "Kona" - Sold and gone. (Read 71432 times)