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Discussion Starter #1 (Edited)
I know I am not forging any new ground here but maybe it has been a while since anybody done one and took a few pictures along the way.

After a few short rides I decided to do a swing arm stretch. I think I have fairly capable hands and a well suited shop after 20+ years of building drag cars and Jeep type stuff. Just finishing a paramotor trike project as another summer toy and it was time to cut something else up and modify it :)

I am in hopes of.....

#1: More wheel base giving a little better straight line tracking, less twitchy that comes from a small short wheel base bike.
#2: lower seat height, I am an old guy and not jumping over things often and lower is more important to me that travel, I can always go to the stiffer spring or add a shim to get ride height back if needed,.... I think.
#3: Hate to admit it but.... looks, there I said it, i hate the way the rear tire looks stuffed up underneath the seat.
#4: More clearance for atv tire following the next mod which will be a hub modification for a suitable atv tire install.

I ordered a used but pretty clean looking swing arm from ebay a few days ago so I could keep all of my original parts. I put it in the cleaning tank for a while and then washed it down and I think it is a good used arm.

Here is a couple pictures of it marked up with cut guides, and then cut and just mocked up for the 2" stretch. Needed to do this much to see inside to determine what my sleeve material is going to be. I ended up ordering a length of 1" x 1.750" chrome mold rectangle and I will have to split it long ways and mend it bank together to hit the mark as close as I can get on fitting the interior for a sleeve.





 

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A few inches would be nice. Though a few inches longer will add a little height unless you shorten your rear suspension a little.

Why a second swing arm if you're using a coupling material? In case complications arise or you want to have a stock back up?
 

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Discussion Starter #4 (Edited)
A few inches would be nice. Though a few inches longer will add a little height unless you shorten your rear suspension a little.

Why a second swing arm if you're using a coupling material? In case complications arise or you want to have a stock back up?
I was thinking that the longer arm would have more leverage over the stock spring and i could expect a slight lowering of seat height ?? I really was just guessing. Be nice to get some feedback on this from someone that has done it before ??

I got the second arm cheap enough I could easily justify keeping my original parts, that's really the only reason. I would of been comfortable either way had I not had such a new bike and wanted to keep the stock arm.
 

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Yeah it sounds like you'll want a shorter and stiffer rear shock since the swing arm will add height and leverage. It's difficult to tell how that will work out for you until you have a chance to test it.

It's nice to know you have a good stock on hand and you can always go back if you hit a complication
 

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"I was thinking that the longer arm would have more leverage over the stock spring and i could expect a slight lowering of seat height ?? I really was just guessing. Be nice to get some feedback on this from someone that has done it before ??"

Hey Doug, you are exactly right in your thinking!

I believe that many of us with extended swingarms have ended up replacing the rear shock spring with a beefier one like the Red one from Procycle.

I envy your tools and talent :D!
 

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While you have the swing arm off you might want to drill some holes to lower it a couple inches later if you decide. I'm 170 lbs and have never bottomed the rear suspension out with the 2-3" drop. View attachment 154810
 

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Discussion Starter #8 (Edited)
"I was thinking that the longer arm would have more leverage over the stock spring and i could expect a slight lowering of seat height ?? I really was just guessing. Be nice to get some feedback on this from someone that has done it before ??"

Hey Doug, you are exactly right in your thinking!

I believe that many of us with extended swingarms have ended up replacing the rear shock spring with a beefier one like the Red one from Procycle.

I envy your tools and talent :D!
Brian... could you add a couple pictures into this thread of you trailer hitch mounted rear shock compressor / spring installer tool.

Here is the last project, waiting on spring to test run it on the ground before painting and putting on the safety net. Plan to haul the TW in the paramotor/camper with me when I go to flyin's.

 

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I tried to just write the word WOW but got a message that said my Quick Reply was too short.

WOW
 

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Brian... could you add a couple pictures into this thread of you trailer hitch mounted rear shock compressor / spring installer tool.
Sure, here you go.

100_3945.JPG

100_4732.JPG

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100_4734.JPG

When Joemama built my extended swingarm, I asked him to weld on a couple of nuts so I could use a spool type of swingarm stand. These really make it quick and easy to lift the rear of the bike for removing the rear wheel, cleaning/lubing the chain, etc.

I just thought I'd suggest it since you will be doing some welding back there.

100_4610.JPG
 

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Discussion Starter #11
Thanks and great idea on the welded nuts and carriage bolts for the lift... is the red T handle used for additional leverage ??
 

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Discussion Starter #13
Got the chrome moly 1.75x1.0" rectangular tubing in today. Looks like i will split it longways on the 1" width with my plasma cutter and a fence setup and tig it back together for a near perfect slip fit inside.Need to find some similar wall thickness plating material on the outside for looks next.
 

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The inside of your swingman is 1inch x 1 3/4 inch. I don't think you need to do anything to your tube to be able to use it. I have always used 1 x1.5 tubing and welded a 1/4 strap to make a 1x1 3/4 sleave. Somewhere in this forum there are pictures of the process that I have used on several extensions. Good luck.
Joemama
 

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Discussion Starter #15 (Edited)
The inside of your swingman is 1inch x 1 3/4 inch. I don't think you need to do anything to your tube to be able to use it. I have always used 1 x1.5 tubing and welded a 1/4 strap to make a 1x1 3/4 sleave. Somewhere in this forum there are pictures of the process that I have used on several extensions. Good luck.
Joemama
Yes, I just realized, had to square up the mouth to get the sleeves started and they drove in w/o having to narrow as i thought might have been necessary.

P.S. I have read here enough to know you would know !! Realizing you done a few of these, did you do a 2" and if so what is your guess on how the oem spring will react at rest and with my 270 lbs on the seat ?? Thanks...

 

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I have done mostly 2" and a couple of 2 .5" . I still have a stock swingman on my bike so I can't be of any help with performance results. Perhaps some of the guys with a stretched swingman will chime in. One tip l will offer, use a spacer at the axle slots when you do the welding. 12 3/8" .
 

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Discussion Starter #18
I used a double nutted all thread to maintain factory spread on this one. Will turn a sleeve for the next one to use in the future.

Thinking I might make these up ahead and keep one in stock for guys that want one. Buying them on ebay when priced right. Trying to stay retired but wife is working 4 more years or so, I like to find stuff to do in the shop to supplement my hobbies.
 

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Joemama set me up with one of his 2" extended swing arm masterpieces. I weigh about 200 lbs and have kept the stock spring and have yet to bottom out the rear. Ride seems a bit plusher due to longer suspension travel available to soak up any given bump. Longer wheelbase increases stability at speed with a minor increase in turning radius. Relatively short 2 inch extension does not create conflict with stock fender and taillight assembly on full suspension compression as one might expect with the longer "Bobber" style 4"+ mods.
 
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