b40rt Posted March 24, 2013 Report Share Posted March 24, 2013 I lengthened mine by 1.5" and it still turns great. I used to feel it wheelied too easily up steel hills and it seems to grip better with the longer arm. Used a scarf cut for strength and inserted a tube for strength - used for 2 years and lots of drop offs/rocky sections and no problems. Stu Whats a scarf cut ? Quote Link to comment Share on other sites More sharing options...
tlrmark Posted March 24, 2013 Report Share Posted March 24, 2013 Whats a scarf cut ? Very common carpentry term, wood joinery. Google it. Quote Link to comment Share on other sites More sharing options...
smelling123 Posted March 24, 2013 Report Share Posted March 24, 2013 Just a cut at an angle, diagonal to the length of the tube (if that makes sense?) - the weakest point will likely be either side of the weld but by cutting it diagonaly the weld is spread along a longer part of the swingarm and therefore the force on the weld is spread. like this http://www.flickr.com/photos/76022002@N08/8586722762/in/photostream 1 Quote Link to comment Share on other sites More sharing options...
matt1996 Posted March 27, 2013 Report Share Posted March 27, 2013 Hi I am just starting to build a bsa bantam trials and I need to extend the swinging arm please could you tell me the diameters of the bushes as I dont have the wider swinging arm yet but I need to make the bushes at college befor I leave college Matt Quote Link to comment Share on other sites More sharing options...
smelling123 Posted March 28, 2013 Report Share Posted March 28, 2013 Matt, I have some in the garage so I will measure them later for you. They are only £8 on ebay though - are you sure you want to go to the trouble of making some? Quote Link to comment Share on other sites More sharing options...
b40rt Posted March 28, 2013 Report Share Posted March 28, 2013 Very common carpentry term, wood joinery. Google it. Sorry, thought it was a bit like a paper cut ! Quote Link to comment Share on other sites More sharing options...
matt1996 Posted March 28, 2013 Report Share Posted March 28, 2013 Hi I didnt mean the brass bushes it was the ones to extend Matt Quote Link to comment Share on other sites More sharing options...
suzuki250 Posted March 28, 2013 Author Report Share Posted March 28, 2013 Sorry, can’t remember what size I made the bushes .. I have an old swing arm somewhere I will try and measure it up over the weekend Quote Link to comment Share on other sites More sharing options...
matt1996 Posted March 28, 2013 Report Share Posted March 28, 2013 Cheers Matt Quote Link to comment Share on other sites More sharing options...
smelling123 Posted March 28, 2013 Report Share Posted March 28, 2013 Matt, just measure the ID of the swingarm tube when you've cut it, should work? 1 Quote Link to comment Share on other sites More sharing options...
suzuki250 Posted April 1, 2013 Author Report Share Posted April 1, 2013 The OD is 28.72mm The ID is 23.5 to 23.79mm (slightly oval) I would guess the original tube ID was 15/16”?? It also has a ridge of braze where the tube is seem-welded Hope this helps Quote Link to comment Share on other sites More sharing options...
matt1996 Posted April 3, 2013 Report Share Posted April 3, 2013 thank you Quote Link to comment Share on other sites More sharing options...
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