Lowering the rear - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 44 (permalink) Old 07-15-2009, 10:22 PM Thread Starter
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Lowering the rear

Hello, I've been poking around in here this forum, but this is my first post.

I'm interested in lowering the rear of my stock 92 Vulcan 750. I looked at buying shorter springs, but first I don't have that kind of money to burn, and second I'd kind of like the challenge of a homemade mod.

I've googled for several hours and come up with something that looks pretty straight forward. I have the steel and the means to make the brackets.

I'm looking for a 2" - 2.5" drop in the rear then an oversized 170/80/15 to help a bit with the gear ratio. Final drop might be about 1.5" and I should fill the fender a little more.

The right side is a no-brainer. I had the idea then found pics to support the idea. I'm stuck as far as the left side and all the pics I see don't detail the left side. Any ideas? The only thing I can think of is a plate from the stock mounting hole on the differential with a spacer to the rear axle under the castle nut. I'm not overly excited about adding a plate under the castle nut though.

IMG_2897 - My stock RH suspension
3602217.. - Modified RH suspension found on the internet
IMG_2900 - My stock LH suspension

Any ideas or pics would be appreciated!
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post #2 of 44 (permalink) Old 07-15-2009, 10:38 PM
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Theese are nightrider's pics, he'll be here soon. Aside from making the plates you will have to get you axle lenghtened.

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Last edited by lance328; 07-15-2009 at 10:54 PM.
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post #3 of 44 (permalink) Old 07-15-2009, 10:54 PM
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Welcome to the group.
On the left side I had to take a round file to the castle nut to make it line up to the hole in the axle.
It works for me.

02 honda sabre 1100
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post #4 of 44 (permalink) Old 07-15-2009, 11:11 PM Thread Starter
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No kidding!? Thanks for the quick reply!

Well, so you use the axle after all eh? Thanks guys, that's great!

I figure 1/4" plate will work, 3/8" plate might be better but I'm working against the axle length...... I'm not sure what you mean by getting the axle lengthened, but I'll take a look at it. Maybe there's 1/4" of material I can take off the head in a lathe (probably not).

I imagine it'll be tough finding a 2ft long bolt suitable for the loads.

Cutting the bolt and welding in a section makes me shudder.

Maybe a shorter castle nut? Maybe a shorter nut AND cut the axle in a lathe.


Anyways, thank you. Off to do some figuring!
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post #5 of 44 (permalink) Old 07-15-2009, 11:12 PM
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Originally Posted by niterider View Post
Welcome to the group.
On the left side I had to take a round file to the castle nut to make it line up to the hole in the axle.
It works for me.
Are you the one who also ground the backside of the axle bolt head some also to make it stick thru the other side come more too?




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post #6 of 44 (permalink) Old 07-15-2009, 11:16 PM
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On the right side on, BMAN's advise, I ground down the axle hole on the swing arm.

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post #7 of 44 (permalink) Old 07-15-2009, 11:18 PM
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Quote:
Originally Posted by denny6006 View Post
Are you the one who also ground the backside of the axle bolt head some also to make it stick thru the other side come more too?
No, I did not modefy the axle at all. I ground down on the swing arm.

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post #8 of 44 (permalink) Old 07-15-2009, 11:32 PM
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No, I did not modefy the axle at all. I ground down on the swing arm.
I remember there was grinding involved.I looked at that awhile back and I remember that shoulder on the swing arm and the nice thing is if you don't like it a washer on the right side and you're back to stock




If you see it on my bike I did it
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Quote:
"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

Psalm 40:1...
XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
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post #9 of 44 (permalink) Old 07-16-2009, 09:43 AM
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Quote:
Originally Posted by denny6006 View Post
I remember there was grinding involved.I looked at that awhile back and I remember that shoulder on the swing arm and the nice thing is if you don't like it a washer on the right side and you're back to stock
That's what I was thinking when I did mine.Figured if I went back to stock I could just weld a washer on that side or just slip one on there and your done.

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post #10 of 44 (permalink) Old 07-16-2009, 10:22 AM Thread Starter
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Here's what I have for the RH drop plate so far. The drawing is in mm cause' I figure the bike is metric SO mm would probably be more accurate. I dunno.

Anyways, here it is. I might contour it a little so it's not quite so ugly. I'll make the first one from sheet steel or plastic to see if it fits.


The left side I'll have to bend or shim with a spacer. Bending 1/4" plate is probably not an option for me. I don't have a hammer that big! HAR!HAR!


That's a good idea for an alternative for stretching the axle. I'll look at it tonight.
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Last edited by spiral_72; 07-16-2009 at 10:30 AM.
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