Author Topic: Ross’s 1975 CB750 K5 (Read 7270 times)

denward17 · « **Reply #50 on:** February 02, 2024, 02:34:05 PM »

^Good question about the fitting...

Galactica · « **Reply #51 on:** February 02, 2024, 03:05:53 PM »

Got it years ago from Z1 Enterprises.

So I reinstalled the carbs. Starts and idles really nice, good throttle response. When I adjusted the air screws, I found no difference turning them from seated right out to two turns. So I put them back to 1 turn out from seated and called it a day.

The weather forecast here for sunny but cool (+6 to +8C) for a week and a half or more, starting tomorrow. I may get some insurance on it. Just hope I don’t have to stop too fast. I have a new set of brake pads due to arrive on the 15th

lash · « **Reply #52 on:** February 02, 2024, 04:19:58 PM »

Easy enough to make, just drill a hole in a bowl screw and solder in a brass tube..

BenelliSEI · « **Reply #53 on:** February 02, 2024, 05:23:02 PM »

Quote from: lash on February 02, 2024, 04:19:58 PM

Easy enough to make, just drill a hole in a bowl screw and solder in a brass tube..

Will do that!

Galactica · « **Reply #54 on:** February 02, 2024, 07:25:57 PM »

I’ve never had a spare that I could sacrifice, so I got mine from Z1E. I actually don’t have it anymore. When I sold my Z1 and KZ1000 LTD, I figured I was finished with old bikes and got rid of EVERYTHING. Thankfully there’s a group of Classic bike guys here and we meet for coffee Wednesdays and Sundays. I borrowed the clear tube from one of them. Oddly I still have my valve hold down tool for charging valve shims.

Galactica · « **Reply #55 on:** February 05, 2024, 01:41:08 PM »

YOWZA, YOWZA, YOWZA!!! I got it! My friend John was right! My assumption that grinding of the pivot lense on the back of the wheel side pad wouldn’t matter was wrong! Mia culpa.

I had ground it off because the dimensions didn’t work. When bolted all together, the pad bound against the rotor. I should have ground off some pad material instead. Without the pivot lense, the wheel side pad never had full contact with the rotor resulting in diminished braking power.

I removed the pad. I made a small domed button from a screw head and epoxied it onto the center of the back of the pad. I sanded off some of the pad material so it would fit. Reassembled it and today I tried it out in the lane. WOO HOO!!

Not two finger braking by any stretch, but confident full force braking. Scared myself a bit when it locked up and the front tire started to wash out. WOO HOO! Now I need a stretch of weather so I can insure and ride it.

When my new brake pads arrive that have the proper pivot lense on, I’ll switch out my jury rigged ones.

I know you guys are just shaking your heads. What a dip stick, right? In my defence I’ve never worked on brakes that weren’t bolted directly to the forks. This older Honda system with a swing/pivot arm is a bit weird to me. But I’ve got it now.

Cheers,
Ross

newday777 · « **Reply #56 on:** February 05, 2024, 02:08:26 PM »

Ross
What is this 'pivot lense' you speak of???

Galactica · « **Reply #57 on:** February 05, 2024, 03:13:56 PM »

Don’t know what else to call it. The convex part on the back of the pad the kinda mirrors the brake pad seat on the caliper side.

newday777 · « **Reply #58 on:** February 05, 2024, 04:34:03 PM »

Is it part of the pad? Without an arrow pointing to what you are referring to I'm lost. What does the parts fiche call it?

Galactica · « **Reply #59 on:** February 05, 2024, 05:40:35 PM »

Ya, it’s part of the pad. The pics are screenshots from Dave Silver Spares (the caliper parts) and Fortnine (the pad). There’s a bulge on the back of the pad. Similar to the pad seat on the caliper side.

BenelliSEI · « **Reply #60 on:** February 05, 2024, 06:11:13 PM »

I’m totally unclear on what you did, but good to hear you solved your problem.

Galactica · « **Reply #61 on:** February 05, 2024, 06:33:30 PM »

When I get my new pads, I’ll take off the other new ones that I ground off, take some photos and try to explain it better.

Galactica · « **Reply #62 on:** February 11, 2024, 08:23:04 AM »

I’m starting to think more seriously about paint.

I’m hoping you fellas will chime in on good sources. I’m going Planet Blue. A quick google search brings up VMR, and Color Rite. I’ve no experience with them, or others for that matter.

My local paint shop likely won’t have any idea what would be correct paint colour. I’ll speak with him tomorrow and see if he’d prefer me to source the paint. If so, what would you guys recommend?

Cheers,
Ross

cooldrum · « **Reply #63 on:** February 11, 2024, 09:02:14 AM »

I have used VMR on my '74 CB750. Sunrise Flake Orange. Very pleased with the color results. Great progress on your CB! Enjoy it.

Galactica · « **Reply #64 on:** February 11, 2024, 06:11:24 PM »

So here’s some questions about the tank trim. Photos attached.

I’m sure these have never been off of the bike. I have new ones in hand from Dave Silver Spares. What’s the best way to remove the existing ones without damaging them? And what’s the best way to reinstall either the existing ones or the new ones?

It looks to me like the tabs holding the trim must be bent away then re-bent. A bit concerning if one has just had the tank painted.

HondaMan · « **Reply #65 on:** February 11, 2024, 06:48:17 PM »

Quote from: newday777 on February 05, 2024, 04:34:03 PM

Is it part of the pad? Without an arrow pointing to what you are referring to I'm lost. What does the parts fiche call it?

I suspect he is referring to the domed center of the OEM version of the pads where the piston pushes (on the powered side)?
The static pucks from Honda also had this, up until 2005 or so. The middle 1cm or so of the static side's backing plate was raised in a semi-dome.

Galactica · « **Reply #66 on:** February 11, 2024, 09:25:25 PM »

Quote from: HondaMan on February 11, 2024, 06:48:17 PM

Quote from: newday777 on February 05, 2024, 04:34:03 PM
Is it part of the pad? Without an arrow pointing to what you are referring to I'm lost. What does the parts fiche call it?

I suspect he is referring to the domed center of the OEM version of the pads where the piston pushes (on the powered side)?
The static pucks from Honda also had this, up until 2005 or so. The middle 1cm or so of the static side's backing plate was raised in a semi-dome.

Yes, that’s exactly it. In my case, the overall dimension from the domed centre of the static pad to the face of the pad material was too great. This caused the pad to bind the rotor. The amount of interference equaled the thickness of the domed centre, so I ground it off. I should have taken off a bit of pad material instead. Dunno why the pad was too thick. It came withe the entire caliper assembly.

Not having dealt with the domed pad backing in the past, I didn’t realize how important it is to this brake. Lesson learned.

Galactica · « **Reply #67 on:** February 13, 2024, 05:44:35 AM »

Ordered Planet Blue paint yesterday from VMR in Billings Montana. Stripes and side covers from PartsNMore in Stratford Ontario (AKA VintageCB750). New tank trim from Dave Silver Spares. Should have all that by next week. Then, when it’s convenient, I’ll remove the gas cap, trim and petcock, and sand blast the tank prior to painting. 🤞

newday777 · « **Reply #68 on:** February 13, 2024, 05:50:02 AM »

Quote from: Galactica on February 13, 2024, 05:44:35 AM

Ordered Planet Blue paint yesterday from VMR in Billings Montana. Stripes and side covers from PartsNMore in Stratford Ontario (AKA VintageCB750). New tank trim from Dave Silver Spares. Should have all that by next week. Then, when it’s convenient, I’ll remove the gas cap, trim and petcock, and sand blast the tank prior to painting. 🤞

Hint.... get a tapered rubber drain plug to fit the opening of the tank to keep the sand out of it! Plug the petcock bung too.

Galactica · « **Reply #69 on:** February 13, 2024, 09:01:52 AM »

Ya, I’ve done it a few times. You can be fairly precise inside the blast cabinet. I just tape up the petcock fitting really well. I go to a U-Blast place where they charge by the time it takes. And they have various blast media/cabinets available.

Here’s a pic of my filler plug. If/when I’m using stuff like muriatic acid and phosphoric acid to clean the inside of the tank, I also make some rubber gaskets.

newday777 · « **Reply #70 on:** February 13, 2024, 10:40:35 AM »

That is a great plug. I like it.

Galactica · « **Reply #71 on:** February 16, 2024, 11:03:06 AM »

Does anyone know where I can get one of these stickers? And what colour should it be? As it is right now it has faded to virtually entirely clear. The lettering in sunlight is almost unreadable. I think it’s only red underneath because the plastic of the decal has blocked the weather and UV light.

I have Planet Blue paint in hand from VMR Paint in Billings Montana. Really helpful fellow, spoke with him on the phone. Seems like a home based business.

I’ll probably sand blast the tank and get it to my painter next week. I’d like to replace the preserve nature sticker above the filler cap if I can for a reasonable price.

cooldrum · « **Reply #72 on:** February 16, 2024, 11:32:27 AM »

4 into 1 has the stickers though they are out of stock as of today. Place an order or contact when back in stock. I used VMR on my '74 CB and was pleased with the results. Preparation is the key and taking your time. Good Luck!

Galactica · « **Reply #73 on:** February 16, 2024, 12:34:04 PM »

Ya there are a number of decal vendors but I’ve not seen any of this particular “preserve nature, always wear a helmet, think safety” decal. I’m pretty confident it was on the bike new in 1975.

BenelliSEI · « **Reply #74 on:** February 16, 2024, 06:34:40 PM »

I think I have one. Probably from a Yamiya decal kit. I’ll have a look.

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Author Topic: Ross’s 1975 CB750 K5 (Read 7270 times)