Rebuild & Sludge trap advice

They lasted long time w/o filters which only catch passage blocking stuff not the friction causing stuff. Look it up and set me straight on false beliefs/faith in filters. Try to always reach full heat before shut downs and change every few 1000 miles or way way sooner if not ridden much. Keep em spun over 2000 too. I am not saying filters are useless or a bad idea, just over blown on how they protect and how long they last. They for sure can't trap the size particles that collect as sludge, which has hardly any hydro carbon component. Scoop some sludge out, any where found, all about same consistency wash with gas or wd40 or acetone or brake fluid then dry and see what is left. Magnets can get some of the ferric dust out but not Al dust which by then is oxidized to sapphire hardness which can cut=abraid hardened steel surfaces. There is a chemical etching oxidation wear component too, that moisture acids accelerates to just flake off w/o any contact friction at all.

13K miles in maybe 4-5 years. No filter, but not a DD and frequent oil changes. Maybe you can see the one scratch that looks like a piece of sand from the hole. Not worn out by any means.



Dave
69S

Nice surfaces there DogT. But there ya go, Norton wasn't just being cheap skates w/o a filter. The soft shells are to give way before journal steel and embed grit too. Sent me for a bit of a spin imagining how a sand grain could get in. I'd think it'd just settle in oil tank if came via in cap or pumped out crank case to tank. I guess it could be pumped to tank while on the fly and tank turbulance let it drift over to be pulled through pump cogs into rod shell.

Filter inspection after a rebuild is educational, especially on skill or quality applying seal goop. Trick is opening w/o contaminating with filter case cuttings. A big tube cutter is best way but as usual big cost for such UN-neccessary task. Even if ya find disconcerting flecks of grey silver and gold, who'd tear it back down unless bad noise or smoke. Racers could monitor it to get sense of risk or power loss renew time. Peel regular filter is 40 mu screen canister, then another small filter before oil pump with surpermagnet ring to pass through, then maybe a bypass filter that only flows when hi fuel rpm rates kick in.