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Gudgeon pins and bearings, replace or not?


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Engine stripped and the pistons are all OK and no play in the gudgeon pins/small end bearings, the question is : should I replace them or not ? They say that the small-end bearing should be reamed to suit gudgeon pin, this sounds complicated and I don’t have the equipment to do this, is this true ?



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hi steve, don't worry , be happy, if the pin is soaked in oil , and you could not feel play it is ok

new it must move under a low thumb pressure see part of my movie on youtube

when renew the bearing it must be honing or cutting to the right size,

not reaming , only with special equipment.

sietse // holland

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I replaced my bronze bushing, when I installed new pistons with their matching new gudgeon pins.


The bronze inserts come new with a slit, they are pressed into place and reamed to fit the gudgeon pin as you said.  I had a local engine machine shop do the bronze insert and ream them to fit.


New bronze bushings



Old bronze bushing and old gudgeon pin



Bronze bushing after 74k miles





Vulcan Grey 89SE


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Thanks guys, I think I’m just gonna be happy and re-install them, they don’t look worn and there is no play against the pin. A machine shop here will charge me $160 per hour so this sort of job will make me cry. Thanks again for your input.

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