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Message started by Savage_Amusement on 06/03/18 at 19:23:16

Title: Swing arm gap
Post by Savage_Amusement on 06/03/18 at 19:23:16

::) :oI need someone who has a stock swing arm handy, to take a measurement for me. After doing some modifications, I think the gap in the rear closed in on me. If you could measure from the outside to the outside of the axel mounts are it would be an amazing help. And also if between the insides of the shock mounts. If I can figure out how to post a photo again, I'll do it.

Thank you.
http://i13.photobucket.com/albums/a287/Cornbreadsqpan/Bikes/IMG_20180603_212348.jpg

http://i13.photobucket.com/albums/a287/Cornbreadsqpan/Bikes/IMG_20180603_211920.jpg

Title: Re: Swing arm gap
Post by batman on 06/03/18 at 21:02:43

Because these parts are welded up they may be different bike to bike ,so there is no exact measurement anyone could give you . If the gap has closed you'll just need to spread it open enough to insert all the parts (and it's one of the reasons not to depend on the index marks to adjust the drive belt /rear wheel for tracking/ straightness). Measuring from the swingarm pivot bolt to the axle on each side is a better way to go.

Title: Re: Swing arm gap
Post by Ruttly on 06/03/18 at 21:32:12

Before cutting or welding you should jig the swingarm with spacers the same width of rear wheel and swing arm pivot. Then do mods. If the rear is too narrow then the front is to wide. Made my spacers out of steel pipe.

Title: Re: Swing arm gap
Post by Savage_Amusement on 06/03/18 at 21:35:45

20/20 ya know, lol. Didn't do much so it shouldn't have moved as far as it did. I was just hoping someone had theirs open so they could give me a quick idea. I appreciate it.

Title: Re: Swing arm gap
Post by Dave on 06/04/18 at 03:34:03

Yep....been there, done that, made the same mistake.

After making a notch in mine for an 18" wheel and Kawasaki front pulley, I welded mine and found out after painting and installing the wheel the gap closed. I put a bottle jack in there and spread them apart again - but I really don't know if the spread equally and the alignment is still proper.

I have a new swingarm without the notch all painted up and ready to go. It turns out that with the double Kawasaki pulley conversion my wheel is all the way back, and I don't need a notched swingarm anymore.

Yes it is hindsight for both of us - but a spacer needed to be in the axle slot while welding. At this point you also need to know the offset spacing, as I don't know that the bottle jack method makes the arms spread equally, as one side may be stronger and not as easy to bend as the other side.

Title: Re: Swing arm gap
Post by sandmanred on 06/04/18 at 03:41:44

I have one loose and measure just shade over 9 inches between the shock lugs and 9 3/8 between the axle plates. Both measurements are inside to inside. You should have a decent chance to pry it back open with a bottle jack or some similar arrangement. Not sure what you modified but that amount of movement after welding is not unusual.

FWIW the stock dimension when I add up the all the spacers and axle adjustment plates that stack up on the axle I get about 9 1/8 inches. So in my opinion that would be enough between plates. Assembly is probably a bit easier with the extra clearance but having to pry it open a tiny bit is also doable.

Title: Re: Swing arm gap
Post by Savage_Amusement on 06/04/18 at 08:33:49

Thank you, that gives me a great starting point to work from. I appreciate the input and advise.

Title: Re: Swing arm gap
Post by justin_o_guy2 on 06/04/18 at 09:16:32

Assemble the axle and wheel
Measure
Put a spacer in the swingarm to equal
Run a long piece of something straight through the pivot, secured and centered.

Cross measure from the left end of the pivot to right end of swingarm
Write that down
Reverse and measure
If it's not even
The swing arm isn't square

Title: Re: Swing arm gap
Post by Ruttly on 06/04/18 at 10:06:07

After the mods are done & cooled remove the jigs slowly to see if it's good. If not tighten jigs heat center x-bar and let cool , try again at removing jigs. If still not right repeat with heat a slightly larger area & let cool. I had to do mine twice !

Title: Re: Swing arm gap
Post by Savage_Amusement on 06/04/18 at 10:46:06

Awesome thanks guys!

Title: Re: Swing arm gap
Post by Ruttly on 06/04/18 at 15:09:42

Was it modified by Ryca ?

Title: Re: Swing arm gap
Post by Savage_Amusement on 06/04/18 at 15:26:27

No, I'm working on making the bike a Solo, and doing some extra work on it, so I shaved off the rear foot peg mounts and filled them in so it would be smooth.

Title: Re: Swing arm gap
Post by Savage_Amusement on 06/05/18 at 10:59:55

After some thinking and rigging we were able to get it back within the distance that I needed hopefully.

http://i13.photobucket.com/albums/a287/Cornbreadsqpan/Bikes/IMG_20180604_192717.jpg

http://i13.photobucket.com/albums/a287/Cornbreadsqpan/Bikes/IMG_20180604_210438.jpg

Title: Re: Swing arm gap
Post by Ruttly on 06/05/18 at 12:11:39

My problem was with the s/a pivot was way too wide , I would jig that too !
Be sure to let it cool down naturally with jigs in place.