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Little End Bush Fitting


andy.t
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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.

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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?

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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 by craig10
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