Author Topic: SOHC Four Swingarms (Read 3209 times)

bill440cars · « **on:** December 28, 2005, 09:23:32 pm »

Guys,
I'd like to know what difference there is, if any between the 500/550/ & 750 swingarms. Several times I've seen parts listed that they say will fit all 3 models. Mainly, I would like to know if the 750 swingarm would bolt up to the 500 or 550 frame and if it might be a little longer and if the lower shock mounts are in the same position as the 500 or 550 ( or are they a little further out?)? Any input on this would be helpful. I'm trying to get my head straight on just how I'm going to build my 550. I've seen some great creations from you guys and I want to try to build mine to be, or as close as I can get, as good as those. At the same time, I want it to be nice in a different sort of way. I guess I'M trying to say that I'd like to build it in hopes that someone might want to admire mine like I do the ones I've seen on this site. I appreciate the time here and I gotta go for now. Bill

HondaMan · « **Reply #1 on:** December 29, 2005, 08:25:52 pm »

I don't have my 500 manual any more, gave it to my brother, or I could talk about the lengths more accurately. But, I do remember this part: lowering the front fork crown about 1/2" to 3/4" and using a CB750 swingarm on a 500 made it handle a lot better at 110+ MPH on sweeping roadrace curves. I seem to remember that the bushings were all the same size: but use the self-lubricating bronze type and check the clearance when you slip them together. The 500/550 stock setup wore the bushings very quickly.

I have a leftover swingarm bolt, if you need one. (That's the long one...). I think I have 3, actually...

bill440cars · « **Reply #2 on:** January 01, 2006, 09:33:13 pm »

Hondaman, Sorry to have taken so long to get back to you. About that bolt, I appreciate that, I'm not sure just exactly what I'm going to do right now. I would like to know though, are the CB500K & 550K the only ones to use the small metal block on the end of the swingarms? I've done some checking and supposedly the CB500K uses the same parts as the CB550K. I'm a little curious, you see I have come up with a slightly smaller version of those blocks (1 block actually) and now I'm wondering where it came from and what it fits. I've gotta get past this, make up my mind what all I'm going to do to my 550, start doing saving up for what I need, gathering up parts and getting on with it. My engine's stuck, so I'm going to have to take care of that pretty quickly. Well, I've rattled on too long already. I'm gone, Bill

78 k550 · « **Reply #3 on:** January 02, 2006, 07:20:34 am »

I have a 500k a 550F swingarm. They look to be the same in about an hour I can walk across the street and look at my niebors 74 750.

Paul

Geeto67 · « **Reply #4 on:** January 02, 2006, 08:00:28 pm »

Quote from: 78 k550 on January 02, 2006, 07:20:34 am

I have a 500k a 550F swingarm. They look to be the same in about an hour I can walk across the street and look at my niebors 74 750.

Paul

any measurements?

78 k550 · « **Reply #5 on:** January 02, 2006, 09:57:50 pm »

Sorry,
guy across the street garage never opened up. Do you have a 750 swing arm now? I'll give them a measure tomorrow sorry it was 60 today and had to ride. What do youneed for measurements?

Paul

Geeto67 · « **Reply #6 on:** January 03, 2006, 05:39:30 am »

I have a 750 swingarm I can measure and post, if you will do the 550 swingarm. I think what it needed is the size of the pivot, the distance of the shock mounts from the pivot, the overall length of the arm, and the width at the axle adjusters. Plus it wouldn't hurt to measure the distance of the sprocket from the center of the wheel just to see if it is feasible to use the 750 wheel on the 550 or to just make spacers for the 550 wheel to fit in the 750 arm.

Talon · « **Reply #7 on:** January 08, 2006, 02:09:10 pm »

hey guys was just wondering what the conclusion of this was. I also want to get a longer swing arm onto my 550 just wondering what will work

HondaMan · « **Reply #8 on:** January 10, 2006, 09:32:55 am »

Hey, Bill440:
Is that a pix of a CL250, CL305, CL160 or CL125 twin? Or, is it a CX? I can't tell from the pix, 'cause it's so small...

bill440cars · « **Reply #9 on:** January 10, 2006, 10:23:59 am »

HondaMan, That's a CL77(305) and it's what I hope to restore my 63' CL72(250) to look like. Gonna take alot of time and money (not too much,I hope). Thanks for the interest. Catch you later, Bill

STLrocker · « **Reply #10 on:** January 11, 2006, 06:09:36 pm »

i just went and measured my 750 swingarm. had one off of the bike so i could get some pretty accurate measurements.

width at the pivot between the mounts to the frame 9 1/8"

width at the axle inside between the axle adjusters 9 9/16"

overall length 20"

lenght from center of pivot bolt to center of shock mount 15 1/2"

diameter of hole for pivot bolt about 14mm or .553 in.

shields102 · « **Reply #11 on:** July 30, 2006, 02:45:53 pm »

I know I am a good deal late to the party, but that is great info on the swingarm specs. Thanks for posting it. It would be amazing to catalog specs such as these for reference.

bill440cars · « **Reply #12 on:** July 30, 2006, 03:18:35 pm »

Quote from: shields102 on July 30, 2006, 02:45:53 pm

I know I am a good deal late to the party, but that is great info on the swingarm specs. Thanks for posting it. It would be amazing to catalog specs such as these for reference.

Better late than never, so I've heard. No, really, not a problem. Just glad that the info is useful to anyone who might want it. Feel free to join in anywhere, that's what we're here for.
Later on, Bill

bill440cars · « **Reply #13 on:** July 30, 2006, 03:45:54 pm »

STLrocker,

Man, I can't remember if I thanked you for the measurements or not. $:-\$ I don't think I did. When I saw that shields102 had made a reply to it, I checked it out and all of a sudden I couldn't remember if I had thanked you or not. Man, I do feel bad

I really do appreciate any effort that anyone puts out to answer anyones questions. So, at this time, I want to thank you for your time and efforts. I usually pay more attention to things like this. Later on, Bill

bill440cars · « **Reply #14 on:** July 30, 2006, 04:18:41 pm »

For anyone who might need the 550 swingarm measurements, that I should have posted ages ago, here they are.
750 550
Width at pivot 9 1/8" 9 1/4" (installed with cups, may be same)
Between Axle Adjust. 9 9/16" 9 9/16"
Overall Length 20" 21"
Center of pivot bolt hole -
Center of shock mount hole 15 1/2" 16 1/2"
Pivot bolt hole dia. .553" .553" (estimate)

Sorry I didn't do this sooner. Seems that someone, on this site, has told me that the 750 swingarm was shorter and that was why they were using one on their 550. Now, for the life of me, I can't remember who it was. I have an idea but, I hate to say. So, it seems for now, if I want a longer swingarm, I'm gonna have to stretch one. Unless someone has info on one. If so, I hope they don't wait as long as I did to get back to this post. Later on, Bill

neil young · « **Reply #15 on:** August 06, 2007, 11:17:45 am »

i haven't measured one yet but apparently a 750 F swingarm is 1" longer than the K model

HondaMan · « **Reply #16 on:** August 10, 2007, 08:08:45 pm »

You'd think that with all the ones I'm rebuilding, I should measure some.

I've got several 750K arms here at the moment, and I think there's a 500 or 550 in the garage. I guess I'll go look this weekend and see what's here.

Gotta go finish a swingarm: broke my hone yesterday and had to get another stone. $:-\$

DarkRider · « **Reply #17 on:** August 10, 2007, 09:12:57 pm »

heh...hondaman i think thats the second time you got caught upating a post thats over a year old lol

neil young · « **Reply #18 on:** August 11, 2007, 12:19:37 am »

Quote from: OutlawZ24 on August 10, 2007, 09:12:57 pm

heh...hondaman i think thats the second time you got caught upating a post thats over a year old lol

well actually it was me that dredged this one up..i wanted to know if you can add a 75-76 750 f swingarm on to a 77 550 frame.reason being is the disk brake setup.and a fatter rear tire

Gamma · « **Reply #19 on:** August 11, 2007, 07:35:57 am »

Just quickly measured the differences between a K7 and an F1.

Got overall length for K7 as 20 and 1/2" F1 is 20 and 3/8", the chain adjuster ends are closed on the F1 and open on the K7.
The K7 arm is profiled to fit a wider wheel (this makes it look alot wider) but it measures 10 and 1/4" between the forks at the chain adjuster end, and the F1 is 10" between the forks.
Remember the F1 has a brake torque arm on the RH side uppermost, the K7 is RH but underneath.
I measured from centre of pivot to centre of shock mount as 16 and 5/8" on the K7 and 16 and 1/4" on the F1.
I know this isn't exactly the same measurments as the previous post, but I hope it will be of some use.

jdawg · « **Reply #20 on:** August 11, 2007, 10:06:25 am »

This is not an answer to your question, but it may be useful info to someone else....

I bolted on a K4 550 swing arm into my K4 750. Bolted up with no issues and no modifications were needed. You do have to use the 550 brake linkage. Everything else was the same.

I did it cuz I like the look of the 550 arm, it's 1 inch longer, a local SOHC4 board member had one for sale, and has a bunch more clearance to the tire. The 550 does not have the pinch weld seam like the 750 arm does. It looks to me a 150 rear tire will fit.

Later -

bill440cars · « **Reply #21 on:** August 11, 2007, 08:48:37 pm »

Man, I hadn't seen this one in so long, I'd forgotten all about it!

Later on, Bill

neil young · « **Reply #22 on:** August 11, 2007, 11:44:23 pm »

Quote from: bill440cars on August 11, 2007, 08:48:37 pm

Man, I hadn't seen this one in so long, I'd forgotten all about it!

Later on, Bill

thats why i love this site

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Author Topic: SOHC Four Swingarms (Read 3209 times)

Talon

shields102