Author Topic: 1978 CB750F Kick Stand (Read 6946 times)

SD750F · « **on:** March 10, 2007, 04:39:28 PM »

Okay for all you 750 Super Sport owners. I have a questions concerning the kick stand. My original one had the bike leaning over 30-35°! I thought that was way too much so I replaced my original with a 1982 CB900 kick stand arm. The new/old one is a little longer so it looks less aggressive that the original.

My question is: Should my original kick stand have the bike over that much???

Scott

Lumbee · « **Reply #1 on:** March 10, 2007, 04:45:44 PM »

...both my F's (77&78) lean over like that..not sure what uncle honda was thinking when they came up with that. It may be that the F is slightly taller, and they just used the same kickstand thats on the K. Either way, yes, mine leans over way to far to. So was the 82 a direct bolt on with no mods?

scondon · « **Reply #2 on:** March 10, 2007, 06:40:05 PM »

Curious as to how long the rear shocks are that both of you use. If a 45 degree lean means the bike is lying flat on the ground then 30-35 degree lean is more than halfway over, right?

Neither one of my bikes lean more than 10 degrees, tops. If they sat up any straighter I'd worry that they'd blow over in a strong wind. Neither one has stock shocks though. 13" and 13.5" eye to cleavis. Otherwise both are stock '78 750F's(mostly).

Lumbee · « **Reply #3 on:** March 10, 2007, 07:11:03 PM »

...I assumed he was imbelishing a bit when he threw the 30 degree angle out there...

medic09 · « **Reply #4 on:** March 10, 2007, 07:47:49 PM »

Quote from: The great "Lumbee" on March 10, 2007, 07:11:03 PM

...I assumed he was imbelishing a bit when he threw the 30 degree angle out there...

Scott's an engineer; I don't think he knows how to embellish!

I found that lean pretty interesting. My 78 K model is like what scondon described; almost straight up. Was like that with the old stock shocks, and the shorter ones I put on didn't effect it much. Sometimes I park it and have to reassure myself it won't fall over. I'm in the habit now of examing even a slight pitch in the asphalt surface when I park. BTW, my littler Yamaha leans way over like Scott described and I never worry about someone knocking it down just by looking at it too hard.

BobbyR · « **Reply #5 on:** March 10, 2007, 08:01:25 PM »

My 78K stands very straight compared to other bikes I have had. I think I read some where they were concerned about proper oil circulation while running on the kickstand.
It may also have been designed to have it fold back under the pipe.

mick750F · « **Reply #6 on:** March 10, 2007, 08:04:32 PM »

I have the same lean on my '78F. A check in my parts list comes up with something interesting that might explain the lean. The product code for the kick stand, 390, indicates that the stand is from a CB550F. Was Honda that desperate to use up parts or did they think that the lean looked cool?

Mike

scondon · « **Reply #7 on:** March 10, 2007, 09:33:48 PM »

Quote from: The great "Lumbee" on March 10, 2007, 07:11:03 PM

...I assumed he was imbelishing a bit when he threw the 30 degree angle out there...

Me too

My bikes do stand pretty straight though so just trying to understand what is considered a "severe" lean and whether or not he had the correct stand to start with.

SD750F · « **Reply #8 on:** March 10, 2007, 09:50:47 PM »

My friend who owns a K6 has no problem at all... Just what you would expect. But the 30° lean is about what I have on my Super Sport using standard length shocks. Now I will be lowering the shocks with my rebuild so the lean will be reduced. I am thinking that the problem may exist with the Super Sport configuration only like some members have suggested.

Scott

scondon · « **Reply #9 on:** March 10, 2007, 10:15:22 PM »

Quote from: SD750F on March 10, 2007, 09:50:47 PM

I am thinking that the problem may exist with the Super Sport configuration only like some members have suggested.

I've got three Supersports, two '78's and one '76, they all lean the same as described by the K8 guys in this thread. I'll take a pic tomorrow and you can judge whether yours leans more or not. What you've described doesn't sound right at all.

MrZxp · « **Reply #10 on:** March 11, 2007, 12:35:53 AM »

Been out of school for a while now...

If, like me, anyone was trying to envisage what 30 degrees of lean was/is like -

MrZxp · « **Reply #11 on:** March 11, 2007, 12:43:31 AM »

This is the lean on mine...

SD750F · « **Reply #12 on:** March 11, 2007, 07:51:04 AM »

Using the protractor that was graciously supplied. Picture this, a straight vertical is 90°, then a 30° lean would be either 120° or 60° on the protractor. Print and cut-out if required...

Interesting thought about using a CB550 kick stand... I will measure the K6 and see if I see a difference.

Scott

scondon · « **Reply #13 on:** March 11, 2007, 10:53:36 AM »

Quote from: MrZxp on March 11, 2007, 12:35:53 AM

Been out of school for a while now...

If, like me, anyone was trying to envisage what 30 degrees of lean was/is like -

That would be me, the guy who can't remember the difference between 45 and 90 degrees

I'll post a pic after the morning coffe.

scondon · « **Reply #14 on:** March 11, 2007, 11:46:28 AM »

Well....by laying MrZxp's protractor over the pic of leaning bikes, and using the vertical pole for reference, I find that they lean EXACTLY 30 degrees. Just never thought it was extreme or undesireable.

Note to self: Never, EVER doubt an engineer

medic09 · « **Reply #15 on:** March 11, 2007, 01:16:06 PM »

I wish my K *did* lean that far. Still scares me how straight up it is on the stand.

Hey Scott, how's that bike doing?

SD750F · « **Reply #16 on:** March 11, 2007, 01:57:56 PM »

Medic09,

Just about to have the frame powdered coated... Tonight I am going to decide of I am going with black or dark grey... Engine out, carbs are in the process of cleaning, and the electrical is just about done with design stage...

Scott

TwoTired · « **Reply #17 on:** March 11, 2007, 04:10:49 PM »

Quote from: scondon on March 11, 2007, 11:46:28 AM

Note to self: Never, EVER doubt an engineer

Unless you ARE one...

Then verify data, references, and calculations....

I've seen a lot of side stands where the wear has either widened the yoke or the bolt was not kept snug. This allowed an exaggerated leanover.
Something to check.

Cheers.

SD750F · « **Reply #18 on:** March 11, 2007, 05:08:43 PM »

TwoTired,
Thanks for the suggestion. Already checked. The mounting stud on the frame was checked for wear and to see if it was bent or otherwised damaged... None. The original, as well as the adopted CB900 kick stand arm mounting screws nice and tight with no mechanical slop. But I am going to check the Length of my Buddie's K6 when I get a chance to eliminate that possibility...

Is there a spec published or otherwised known in the mechanics world of design limits of the lean?

Scott

Hockers Choppers · « **Reply #19 on:** March 11, 2007, 05:59:28 PM »

Don't worry about the angle of lean on the kick stand!!!! The damn thing shouldn't even be on the stand this time of year anyway!!!!! Go ride the thing and find something worth worrying about!!!!!

SD750F · « **Reply #20 on:** March 11, 2007, 06:11:16 PM »

Well it looks like someone woke up on the wrong side of the bed. It sounds like you need to follow you own advice and go ride and let someone else help out on this topic...

Scott

Hockers Choppers · « **Reply #21 on:** March 11, 2007, 06:34:35 PM »

Yes, it rained all day today!

I'll check the angle of my bike on the kickstand for you if it really matters that much

I'd say if it was around 30 degrees it would be close enouph? But I'll check for you. Shock length would be about all that could change this, unless someone has changed kickstands, but I'd think they were all the same length?

SD750F · « **Reply #22 on:** March 11, 2007, 08:22:48 PM »

That is why I asked the question in the first place. I have seen several K series and all do not have the severe lean that my 1978 F series has... And other riders who are familiar with the bike have mentioned that they thought something didn't look right.

Right now my frame is bare and ready for powdercoating. And before I have it coated I would like to know with there is something I need to look at on the frame or other. If I need to check the mounting tab on the frame and make an adjustment. Or look else where once I begin re-assembly. I was hoping to find some feedback here with the vast assortment of members and experiences...

Scott

P.S. The motorcycles have begun to ride the streets here in Sioux Falls SD. It hit 57°F as a high today! Spring is here!

Hockers Choppers · « **Reply #23 on:** March 11, 2007, 09:05:44 PM »

DON'T CUT ANYTHING!!! What length are your shocks? How long is your kickstand from center of pivot hole to tip? ( I can't belieive I just asked someone how long his kickstand is!!

) Do you have the right size wheels and tires? All these will factor the angle, OOPs I forgot your and engineer.

I have the same bike, so if you need any pics or measurements let me know. Also have a set of stainless steel brake lines, white gauge faces, drag bars, and shorter shocks that work perfect on the F's. Have some spare F engine parts as well, let me know if you need anything.
Jesse

mick750F · « **Reply #24 on:** March 12, 2007, 05:46:27 AM »

As I said before the part number for the '77-'78F side stand is for a 550F. 50540-390-000 I don't have a parts list for a K or I'd look it up. If you can look at a parts list for a K and see what the side stand number is, it would at least let you know whether the K stands were the same as the F...I'm guessing they're not. The F stand being from a smaller bike would explain the lean to me.

Mike

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Author Topic: 1978 CB750F Kick Stand (Read 6946 times)