How to mount swingarm spools - Honda CBR250R Forum : Honda CBR 250 Forums
User Tag List

 2Likes
Reply
 
LinkBack Thread Tools
post #1 of 12 Old 09-22-2015, 07:30 PM Thread Starter
Member
 
gyrotumbler's Avatar
 
Join Date: Oct 2014
Location: Tampa, Florida
Posts: 86
Thanks: 15
Thanked 45 Times in 31 Posts
How to mount swingarm spools

Bolted on Tabs and Welded on Tabs

1). Bolted on Tabs
At the bottom rear of the swingarm angle iron tabs can be bolted on.
This requires fabricating the angle tabs, and removing the swingarm to drill two 8mm holes on the bottom rear of the swingarm behind the axle. The holes behind the axle should not affect the structural strength of the swingarm. Also, the swingarm is real easy to remove. This does not interfere with chain adjuster at all and the chain adjuster can still be pulled out of the swingarm.






Making the Tabs. All my cuts were made with a electric 4 ½” angle grinder with ⅛” cutoff wheel. Mount the angle iron in a vise, or vise grip pliers clamped to something solid. wear gloves, the metal gets hot, it has sharp edges after cutting, and sometimes the grinder will try to jump out of your hands.
I cut two, 1 ¼ inch wide pieces, from 3/16 inch thick x 1 ¼ inch x 1 ¼ inch steel angle iron to make the tabs.
You need a 6” rule and a metal scribe to mark the steel for cutting and drilling. First layout the face, It will only be 1” wide. later you will cut ¼” off the front edge of the face. Scribe a line from bottom to top of the face 1” from rear edge, and continue on the top edge 5/16”. When you cut this ¼” off the front edge the face will be 1” wide. On the second piece of angle iron the line will be on the opposite side, or its front edge


Now layout the holes to be drilled. On the face mark the center of the spool mounting bolt hole. It’s ⅞ inch down from top and ½ inch from rear edge. My spool mounting bolts were 8mm so I drilled a 5/16 inch hole. Most spool bolts are either 6-8-or 10mm.

Next layout the two mounting holes on top of the angle iron. They are centered ⅝” from the outside edge, and 5/16” from the front and rear edge.
I should point out that 5/16 inch and 8mm are the same. Next center punch all the holes, the bigger the hammer the better. A bigger dimple helps prevent the drill from wandering. I used a harbour freight step drill bit mounted in a cheap chinese drill press to drill the holes.
There is ½ inch of room inside the swingarm for the nuts and bolts to come through. They only take up ⅜ inch. I used M8mm x 20mm length socket head cap bolts, lock washers, and
nuts to attach them. A 16mm length can also be used. These can be tightened from the bottom with an allen wrench.





There is not a lot of room inside the swingarm for a wrench to move. You can use it to hold the nut while turning the bolt with an allen wrench. After drilling the mounting holes in the angle iron I used it for a drilling guide for drilling the swingarm holes. Here you need a 5/16” drill bit instead of the step drill bit, as it will just wander around. I clamped a piece of metal for a straightedge to the outside edge of the swingarm and clamped the tab to it so it would be perfectly straight when drilling the holes. Use blue painters tape on side of swingarm if you don’t want any scratches. Because of the clamp on the tab you can only drill one hole at a time. Drill one hole put a bolt and nut in to hold the tab in place. Make sure the tab didn’t move when tightening the bolt. Check it again before drilling the second hole.

Swingarm is upside down


The rusty bolt is the same diameter as inside spool diameter. The metal piece on the outside of the swingarm curves under the swingarm. As the axle is moved back for chain stretch the angle iron is notched to allow clearance for this



The black coating on the steel is mill scale and it needs to be removed before painting.
A one foot piece of angle iron is available from McMaster-Carr for under $5 plus tax and shipping. I paid around $12. The part #9017K15 is what I ordered.

2). Welded on Tabs

If you can weld, or if you have a friend that can weld the tabs on for you, This is what you need. Tabs made out of 1” x 1” x ¼” thick steel flat bar.
You can buy tabs on ebay cheaper than making them yourself. (I wish I had know this before making 3 sets). Here’s a link to the page Weld Tabs 1 4" Steel Pack of 10 | eBay they are 1 1/4 tall and 1/4" can be cut off. The hole size is not listed but you can ask and he’ll probably make it any size you want. Most spool bolts are either 6-8-or 10mm.
I removed the swingarm to weld them on.
I clamped a piece of metal for a straightedge to the outside edge of the swingarm and clamped the tab to it so it would be perfectly straight when welded.

All the bikes I looked at had the spools in front of the axle. Measured with the chain adjuster removed mine are 3 inches from the rear of the swingarm to the rear edge of the tab. Any shorter and you can’t move the axle all the way forward.
pictures coming soon

The grass is always greener . . .

Last edited by gyrotumbler; 09-22-2015 at 11:28 PM. Reason: Added part 2
gyrotumbler is offline  
The Following 2 Users Say Thank You to gyrotumbler For This Useful Post:
Stichill (09-22-2015)
Sponsored Links
Advertisement
 
post #2 of 12 Old 09-22-2015, 09:07 PM
Senior Member
 
Stichill's Avatar
 
Join Date: Jul 2012
Location: Kentucky, USA
Posts: 2,213
Thanks: 656
Thanked 619 Times in 402 Posts
Impressive, gyrotumbler, thanks for sharing your well-considered solution for bolt-on spool tabs.

There's a lot to like here:

1) Cheap

2) Light weight

3) Can be made by anyone with some patience and simple tools

When gyrotumbler posts the welded-tab method, I suggest to the moderators that this thread become a sticky. It is thoughtful and well-illustrated posts like this that keep me coming back here to CBR250.net. This kind of information really adds to the body of community knowledge.
Stichill is offline  
post #3 of 12 Old 09-22-2015, 09:30 PM Thread Starter
Member
 
gyrotumbler's Avatar
 
Join Date: Oct 2014
Location: Tampa, Florida
Posts: 86
Thanks: 15
Thanked 45 Times in 31 Posts
After a couple of failed attempts at a bolt on method, I decided I have welder I’ll just weld mine on. That was it I was done.

Stichills interest in my welded on spools inspired me to finish this project.

I would also like to thank Stichill for some important measurements he sent me.
Stichill likes this.

The grass is always greener . . .
gyrotumbler is offline  
 
post #4 of 12 Old 09-23-2015, 04:42 AM
SDM
Senior Member
 
SDM's Avatar
 
Join Date: Jun 2012
Location: Fairview Quezon City Philippines
Posts: 601
Thanks: 402
Thanked 185 Times in 117 Posts
I dont have the tools to do either way so I just bought mine from T-Rex. Great write up with good info thanks for the share.
Attached Images
File Type: jpg N39-11SAurl.jpg (37.0 KB, 22 views)
File Type: jpg N39-11SA-RH.jpg (105.7 KB, 39 views)

June 2013 BOM winner
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Custom Painted
Steel braided brake lines
CORBIN front and pillion seat
HID Projector, W/ orange demon & red, white angel
305cc Big bore kit, PCV + Auto tuner, Ohlins rear shock, Emulators, .95 springs, Sintered HH pads. S.S. header, 2 Bros slip on, integrated brake turn signals, -1/+2, flush mount turn signals, tail tidy, T-Rex sliders, and rear spools
SDM is offline  
post #5 of 12 Old 09-23-2015, 07:44 AM
Senior Member
 
SpotTheDogg's Avatar
 
Join Date: Oct 2014
Location: Miramichi, New brunswick
Posts: 262
Thanks: 29
Thanked 28 Times in 23 Posts
I just bought $6 universal spools from Florida on EBay and drilled 1/4" holes in the side of the swingarm, light,cheap,fast

If I was to spend money on this I'd get the Yoshimura knockoffs that replace the tensioner plates.

http://www.ebay.ca/itm/CNC-Swingarm-...d7d8a2&vxp=mtr

2003 VFR800A
1990 VTR250 track bike
1974 CB360 Café
2009 BMW F800GS
GF's track bike 2011 CBR250R

Last edited by SpotTheDogg; 09-23-2015 at 07:53 AM.
SpotTheDogg is offline  
post #6 of 12 Old 09-23-2015, 07:55 AM Thread Starter
Member
 
gyrotumbler's Avatar
 
Join Date: Oct 2014
Location: Tampa, Florida
Posts: 86
Thanks: 15
Thanked 45 Times in 31 Posts
[quote=SpotTheDogg;588226]I just bought $6 universal spools from Florida on EBay and drilled 1/4" holes in the side of the swingarm, light,cheap,fast


Post a picture. You can call it a better way to mount spools. I wanted to drill a hole in the side of the swingarm also.

The grass is always greener . . .

Last edited by gyrotumbler; 09-23-2015 at 08:30 AM.
gyrotumbler is offline  
post #7 of 12 Old 09-23-2015, 07:57 AM Thread Starter
Member
 
gyrotumbler's Avatar
 
Join Date: Oct 2014
Location: Tampa, Florida
Posts: 86
Thanks: 15
Thanked 45 Times in 31 Posts
Quote:
Originally Posted by SDM View Post
I dont have the tools to do either way so I just bought mine from T-Rex. Great write up with good info thanks for the share.
This is a good choice for many people.

The grass is always greener . . .
gyrotumbler is offline  
post #8 of 12 Old 09-23-2015, 09:02 AM
Senior Member
 
SpotTheDogg's Avatar
 
Join Date: Oct 2014
Location: Miramichi, New brunswick
Posts: 262
Thanks: 29
Thanked 28 Times in 23 Posts
Quote:
Originally Posted by gyrotumbler View Post
This is a good choice for many people.
It is a great option but kinda pricey
EBay knockoffs aren't too overly expensive

2003 VFR800A
1990 VTR250 track bike
1974 CB360 Café
2009 BMW F800GS
GF's track bike 2011 CBR250R

Last edited by SpotTheDogg; 09-23-2015 at 09:07 AM.
SpotTheDogg is offline  
post #9 of 12 Old 09-23-2015, 09:19 AM
Senior Member
 
SpotTheDogg's Avatar
 
Join Date: Oct 2014
Location: Miramichi, New brunswick
Posts: 262
Thanks: 29
Thanked 28 Times in 23 Posts
[quote=gyrotumbler;588234]
Quote:
Originally Posted by SpotTheDogg View Post
I just bought $6 universal spools from Florida on EBay and drilled 1/4" holes in the side of the swingarm, light,cheap,fast


Post a picture. You can call it a better way to mount spools. I wanted to drill a hole in the side of the swingarm also.

Heres a picture, bikes are loaded in the trailer. BTW I'm not saying my way is better, just less time and money

What you did is very nice and I appreciate the work and your sharing it.


2003 VFR800A
1990 VTR250 track bike
1974 CB360 Café
2009 BMW F800GS
GF's track bike 2011 CBR250R
SpotTheDogg is offline  
post #10 of 12 Old 09-23-2015, 12:25 PM Thread Starter
Member
 
gyrotumbler's Avatar
 
Join Date: Oct 2014
Location: Tampa, Florida
Posts: 86
Thanks: 15
Thanked 45 Times in 31 Posts
[quote=SpotTheDogg;588258]
Quote:
Originally Posted by gyrotumbler View Post


Heres a picture, bikes are loaded in the trailer. BTW I'm not saying my way is better, just less time and money

What you did is very nice and I appreciate the work and your sharing it.
I thought of putting one there right above and a little forward of where mine are welded on. It's a good easy solution for people to use. Thanks

The grass is always greener . . .
gyrotumbler is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda CBR250R Forum : Honda CBR 250 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome