Hi guys, Want to replace the o-ring seals after an oil change are they imperial or metric? id like to get a box of multiple sizes suitable for bikes and also wheres the best place to buy? based on price & quality etc
Thanks in advance
Steve

Right or wrong (?) I don't replace O-rings after every oil change. I just inspect them for cross-section roundness, and if they aren't too flattened I re-use them. When they are up for renewal, I just buy OEM.

Everything on the bike is metric (except for tyre diameter....), so I would've thought O rings would be metric too. I think the section thickness is important also....

Very important.

Otherwise, yeah, replace when it starts leaking. Which it probably wont. I've got a big stack of filter cover ones because they come with the filters, but I've never changed one.

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sorry to ask....but...what O rings are you on about? you mean the little orange one on the oil bleed screw or what ever its called?!?! (the bottom bolt on the oil filter cover)

Thats my approach too - have done 4 changes on the bike so far and have found the O ring to be in good shape each time. I did check with the Yamaha dealer when I did the first and was told that they only replace when needed.

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