Vintage Dirt Bike Q & A

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PostPosted: Wed Jun 21, 2017 8:48 am 
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Joined: Sat Jun 17, 2017 10:27 pm
Posts: 4
Finding an aluminum swingarm for a 79 honda cr250 is proving next to impossible. Has anyone tried to modify an 82/83 prolink swingarm to a twinshock configuration? What kind of problems have you encountered with strength after rewelding? Will the bearings on the prolink match up to the 79 cr250 pivot bolt? Will the rear axle match up to the swingarm? Any help will be greatly appreciated!


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PostPosted: Mon Jun 26, 2017 10:03 am 
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Joined: Fri Jul 14, 2006 8:12 am
Posts: 323
Location: Wuppertal/Germany
converted a 83 480 swingarm to fit my 80 250.
you will need an 83 rear axle, selfmade rear engine mount, brake rod and stay, distances for the rear wheel or use an 82 or 83 wheel as i did, maybe some other things i do not remember at the moment. :D


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80 CR250Ra
80 CR250Ra
78 CR250R
80 CR80
82 Bultaco Sherpa 340
78 Bultaco Pursang 250 MK12
76 Bultaco Frontera 370 MK10
76 Bultaco Alpina 250
73 Bultaco Lobito 125 MK6
76 Suzuki RM125A
90 Kawasaki KX250


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PostPosted: Sat Jul 01, 2017 2:50 pm 
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Joined: Sat Jun 17, 2017 10:27 pm
Posts: 4
b-joe, thanks for the reply. I was lucky enough to find a thor arm that fit like a glove, so I have abandoned this project. You did beautiful work to get the cr480 arm to work, especially that milled motor bracket. I feel that your answer to my question is probably beyond my fabrication abilities. Thanks, Brad


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