andy.t Posted November 21, 2013 Report Share Posted November 21, 2013 Just looking for some advice please. Had a quick look on the Internet regarding the fitting of bronze little end bushes and what I thought would be an easy job of drawing in a new bush an sizing it using an adjustable reamer is in-fact not so simple. Concerns are keeping things true, not taking out too much with a reamer and so on. Any advice would be appreciated. Quote Link to comment Share on other sites More sharing options...
copemech Posted November 22, 2013 Report Share Posted November 22, 2013 You don't say which motor, but likely to require some special jigs such as used on the aircraft rods I have done at local specialist machine works. Quote Link to comment Share on other sites More sharing options...
b40rt Posted November 22, 2013 Report Share Posted November 22, 2013 (edited) Rupert Ratio. Page 71 ISBN 0 - 9535098 - 1 - 8 Edited November 22, 2013 by b40rt Quote Link to comment Share on other sites More sharing options...
andy.t Posted November 22, 2013 Author Report Share Posted November 22, 2013 The bike is an AJS Stormer, not exactly pre65 but I know the principal in fitting and reaming the bush should be similar for most bikes...I would have thought. The info I have found would suggest you just draw a new one and and ream by an adjustable reamer, but then others say it has to be reamed to within a thou of being true with the crank. Others mention all sorts of horror stories when its not just spot on. Anyway was just looking for a bit of advice on how to get things as near to spot on by doing it myself....take it to an engineering workshop perhaps would be a better answer. By the way the crank is out but still attached to the Conrod. Sorry b40rt but what is Rupert Ratio page 71 all about? Quote Link to comment Share on other sites More sharing options...
b40rt Posted November 22, 2013 Report Share Posted November 22, 2013 Shows how to do this in detail, worth having a look. Rupert Ratio is a B40 book, but check it out if you can borrow one. Quote Link to comment Share on other sites More sharing options...
andy.t Posted November 22, 2013 Author Report Share Posted November 22, 2013 Cheers for that info b40rt, had a quick look for info on that book and found this http://www.b50.org/phpBB2/viewtopic.php?f=3&t=5347 Jesus.....give me a little end needle roller bearing every day of the week. 1 Quote Link to comment Share on other sites More sharing options...
craig10 Posted November 22, 2013 Report Share Posted November 22, 2013 (edited) An experienced worker at a local engineering firm offered to size the small end bushes on a pair of Guzzi conrods for me using a honing machine. He didn't rate trying to do it with a reamer due to the difficulties in keeping it square without making a Rupert Ratio style tool. He also said if the fit is right the pin should slowly fall through under its own weight. If it drops through like a stone there's too much clearance. Edited November 22, 2013 by craig10 Quote Link to comment Share on other sites More sharing options...
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