Author Topic: 74 CB750 Navy Style (Read 80462 times)

RAFster122s · « **Reply #125 on:** August 20, 2012, 02:18:36 AM »

Forks came out nice. So, you planning lots of little details like this that are eye catching and you keep finding more and more as you look at the bike?

Harsh · « **Reply #126 on:** September 14, 2012, 03:02:22 PM »

Long time no update. I have been dealing with some health issues so progress has been slow. Somehow I managed to rupture three discs and have another three bulging discs in my neck.

I ordered some wheel and neck bearings and they came in today so I promptly went to install them. I tap in the first side and secure it with the bearing retainer. I set the distance collar and use the axle to align it and proceed to start tapping in the other bearing. I start to get close to the collar so I start taking it easy not wanting to set the bearing too tight against the collar. I check numerous times and each time the collar is just a little too loose. A couple of light taps and check again...#$%* me running it is now too tight. I tried to back the bearing out using a brass drift, but there isn't enough surface for the drift to grab. To make matters worse I did it to both the front and rear hubs. Why they didn't just machine a lip on both sides to set the bearings against is beyond me. All I need is to back the bearings out 1mm and everything will be good to go.

On a brighter note I got the neck bearings in just fine. They had stops for the races.

Harsh · « **Reply #127 on:** September 15, 2012, 10:18:30 AM »

I was able to back the rear bearing out enough to allow it to spin somewhat freely. I am going to keep working on it to get it completely freed up. The front however doesn't seem to want to budge. I keep taking breaks when I get frustrated so I won't destroy anything. On my last break I decided to do a mock up.

Harsh · « **Reply #128 on:** October 10, 2012, 09:30:51 AM »

Managed to get the bearings freed up.

I ordered new stainless steel spokes from Buchanans which arrived yesterday so I guess over the next few days I will be lacing the wheels. I don't have the equipment to true them, but a buddy of mine that works at the local Ducati dealership is pretty good friends with one of the techs that has a very nice truing setup. He said he can get me a pretty good deal so we shall see.

Stev-o · « **Reply #129 on:** October 10, 2012, 07:21:28 PM »

I would lace em loose and let the pro tru it. Have tires yet?

Harsh · « **Reply #130 on:** October 11, 2012, 03:28:36 AM »

That is the plan. However, I didn't know to take offset measurements before I took the wheels apart so I am not sure what to do/tell the guy that is going to true them.

No tires yet, but I think I am leaning towards the BT45s

jerry h · « **Reply #131 on:** October 11, 2012, 10:24:45 AM »

Harsh - really enjoying your thread! Its been fun a fun read so far. With all of your attention to detail, the bikes going to look great.

Harsh · « **Reply #132 on:** October 12, 2012, 07:45:06 AM »

Thanks Jerry.

I succesfully laced the front wheel last night. It took a bit of time since the pics I took were corrupted so I had to search for some pics here that provided the views I needed. I will get a pic of it today when I get home. Tomorrow I will do the rear wheel.

Harsh · « **Reply #133 on:** October 12, 2012, 01:40:30 PM »

Ran into a huge problem when trying to lace the rear wheel. The spokes they sent me don't even come close to fitting. I guess I will be on the horn with them Monday.

Harsh · « **Reply #134 on:** October 13, 2012, 08:21:58 AM »

Wanting to give Buchanan's the benefit of the doubt I went back out today to start from scratch on the rear wheel. Unfortunately, I ended up with the same results. I think the inner spokes are correct, but the outer ones are way off. With just the inner spokes installed and finger tight the hub is pretty centered on the wheel. With one side of the outer spokes very loosely installed the other side is a good inch off and doesn't even reach the hole.

Inner spokes installed:

With one side of outer spokes installed. Attempting to install the other side:

It doesn't appear that the bend is correct and they might be a bit on the short side.

brandEn · « **Reply #135 on:** October 13, 2012, 08:36:52 AM »

Ya know what, there was a thread recently about Bucannon spokes having this issue. I will see if I can find it.

brandEn · « **Reply #136 on:** October 13, 2012, 08:37:26 AM »

http://forums.sohc4.net/index.php?topic=105989.0

Harsh · « **Reply #137 on:** October 13, 2012, 08:45:44 AM »

Oh yah...I read that a while back. Hopefully they won't give me the run around on Monday when I call. It just annoys me to some degree that they can't get things right.

I am half tempted to acquire some 77/78 K spokes to use as a mockup and verification of the bends required. Remember I am marrying a 74K hub to a 75 GL wheel. Everything I have read states that the 77/78K hub is the same as the 74 (p/n's do cross) and that the 77/78K wheel is just a steel version of the 75 GL aluminum wheel.

SOHC4 Cafe Racer Fan · « **Reply #138 on:** October 15, 2012, 07:17:30 AM »

Steve, you should not have any comparability issues with the hub wheel combo. I hope Buchanan's sorts out the spoke issue for you.

Harsh · « **Reply #139 on:** October 15, 2012, 08:02:13 AM »

I am hopeful that they will.

Where in OC are you located? I used to live in Brea when I was a kid.

Harsh · « **Reply #140 on:** October 15, 2012, 10:45:37 AM »

Well this was their written reply.

We normally make these spokes with a slightly shorter neck for strength
purposes. The stock spokes come with a longer neck and they seem to
break easier. What you can do is put higher blocks under the rim and
push down on the hub to insert the outer spokes. there won't be any
issues by doing that.

Yah not gonna happen. They are going to remake my spokes with the correct bend and length.

SOHC4 Cafe Racer Fan · « **Reply #141 on:** October 16, 2012, 02:25:01 PM »

I agree. They should re-do the spokes correctly.

I am presently in South OC (Aliso Viejo), but moving to Long Beach soon.

RAFster122s · « **Reply #142 on:** October 18, 2012, 12:03:15 AM »

From what I have read in Buchanan threads on the forum is you will have a fight with them to make it right as they will pull the custom spokes card are nonreturnable...
I hope you are able to get them to make it right.
A kludge is just that...and putting them under a load like they describe is asking for a broken spoke with some time under tension and normal loads.

Harsh · « **Reply #143 on:** October 18, 2012, 03:16:41 AM »

After a number of emails and calls they agreed to take back the incorrect spokes and are going to remake new ones with a slightly longer throat and a little more bend. Doing those two things should fix the issue I have. I believe sending them pictures was a key element in getting them to replace them.

I found it funny that Angel said that by lengthening the throat it makes them weaker and they tend to break. The spokes I need are the exact same as the 77/78 K bikes. There are plenty of original spokes still on the road. Is the metallurgy of the 70's better than the metallurgy now? I don't think so. When I made that statement there was dead silence on the other end of the line. When it came to them wanting me to bend them I had to explain some simple geometry/engineering that doing so would actually increase the distance from the end of the spoke to the hole in the wheel.

They should receive the incorrect spokes today or tomorrow so I expect to have the new spokes by the end of next week. I will update everyone on how the new spokes fit.

Gobo · « **Reply #144 on:** October 24, 2012, 06:10:55 AM »

I think I know what your experiencing. I am also doing the GL front end swap and wanted the DID rim in the rear. All of my research taught me the following...

The GL rim is 17" compared to the stock 18", which means the spokes will need to come off the hub at a steeper angle to get to the center of the smaller diameter rim. This would explain what your seeing in the images you posted above.

From what I've read, people do one of the following...bend and force the spokes and run it like that (note that I have yet to hear anyone mention actual spoke failure, but there are plenty of recommendations against it), second I read about people having the spoke flange area machined to allow the spokes that steeper angle, and finally I found that a CB750A rear wheel has a chain drive CB hub, but runs the same 17" DID rim off the GL. I now own both and visually it does look machined at a steeper angle, but all other features are identical. Using my existing sprocket, it is a direct swap on my 73' (I think the CB750A's had a different drive chain size).

I'm sorry I can't point your at any of the posts or sites I have culled this info from, but it has been a lot of searching and reading. I can post images laterite anyone is interested, I just have nothing at the moment.

I hope it helps.

Harsh · « **Reply #145 on:** October 25, 2012, 02:04:55 PM »

My replacement (outside) spokes arrived today and they don't fit.

I already had the inside spokes installed just waiting on the new outside spokes to arrive. I installed the first side with no issues. Flip the wheel over to do the other side and instantly notice I have to give the spokes a slight bit of downward pressure to get to the hole. I wasn't necessarily to worried about that, I didn't like it, but I wasn't too worried. The big issue comes when I go to start finger tightening the nipples. I work around the wheel a couple of turns at a time and everything is looking OK until I noticed that the outside set on the side I had to put some downward pressure on, the spokes are starting to protrude past the nipple. OK I think, I guess I will just have to grind some off of those spokes. Then the major issue rears its ugly head. I notice that all of the inside spokes on the opposite side of the hub (from the side I had to put downward pressure on) are also extending past the nipple. However, those spokes bottom out in the nipple well before they even begin to get snug.

I am so upset right now it isn't even funny. I need to call Buch's to speak with someone, again. Ultimately, I would like to send them my wheel and have them cut the correct spokes and lace it since they can't seem to do it correctly without my parts. However, I am not going to pay for their services and I don't feel I should cover shipping to/from.

RAFster122s · « **Reply #146 on:** October 26, 2012, 12:04:27 PM »

Harsh, This is what I have read in other threads about their spokes in some applications. I hope you get it resolved.

What is the offset measurement of the rear hub. This can throw off the spokes and make it fit wrong on one side.

Gobo · « **Reply #147 on:** October 28, 2012, 10:08:34 AM »

I dug out my two rear wheels for you to see. Stock CB750K3 and CB750A.

First, apologize for the bad photos. And I do realize now that I took the drive side of one wheel and the brake side of the other, but I just checked and they are the same on both sides of the hubs.

These hubs are the same part number and are identical in all ways...accept the following....

Note the smooth flange of the stock wheel, and the thickness of the edge. Then look at the distinctly chambered side of the Auto's flange and the thickness of its edge. It is much thinner. You can even see the tool marks where it appears to have been machined vs. the polished surface of the stock hub.

I think the factory used the same part but with a different machining finish on the auto hub. That auto hub came stock with the same 17" aluminum DID rim your trying to lace up. The same rim used on a 75-76 GL1000.

My sincere hope is that Buchanan's hooks you up. I hear great things about them and I hope they stand by you. I love the bike and can't wait to see her all together!

Gobo · « **Reply #148 on:** October 28, 2012, 10:09:33 AM »

Sorry...wanted to get you large images so you get two posts

Harsh · « **Reply #149 on:** October 29, 2012, 10:08:29 AM »

Thanks for the pics and info.

I just got off the phone with Angel (lead wheelsmith) and I am going to send in my wheel/hub. They are going to cut & bend the spokes to fit and loose lace the wheel for no additional extra charges.

I am happy about that, but unhappy knowing that it is going to cost me another $50 or so in shipping charges.

News:

Author Topic: 74 CB750 Navy Style (Read 80462 times)