Crosshatch???

[Nessism]

I've been trying to keep up, and always eager to learn. Ed just mentioned something I'd been wondering about since post [NODE="4"]Groups[/NODE] He said, We want some friction between the rings and new cross-hatch so the rings wear and seat quickly. That's what I'd always thought, the new cross-hatch made tiny little ridges that the new rings would kind'f rub or, hone down, to perfectly match the new rings. old cross-hatch had "already been rubbed or honed down to fit the old rings". Then post [NODE="4"]Groups[/NODE] said the honing was for final sizing, If the pistons and rings fit, why would you hone them any more? Why take off more stock if the pistons and rings fit right?...

If you know for a fact that the rings were sealing well before, then it's best to leave everything be. Purchasing used parts kills that train of thought, though. And when removing the rings from the pistons, they may move out of shape slightly, so that's in play too.

 

[Kara25]

Nessism exactly what i thought bcs i got lucky(?) 3 years ago on a top end refresh on my 550 just throwing away the old cooked gaskets that were leaking when i got the bike from the PO and reput the same rings back in on a Y shape. 3 years after and the bike doesnt burn a single drop of oil. And the bores of the 550 when i tore it down were much more glazed than those 650 ones i got. But as you said on unknown parts with no prior knowledge of how it was running why gamble even if it seens low mileage??

 

[Rob S.]

I'm trying to keep up, and learn new things. Bottom line, a la Nessim, reminds me of my mechanic's credo: if it ain't broke, don't fix it. Or in my case, if it ain't broke, don't break it. :beguiled:

 

[rphillips]

Sorry for not exactly understanding. Is it if you use orig. sleeves, pistons, and rings, and they fit good, don't hone. If orig. sleeve, pistons, that fit good, but with new rings, do I hone to get good wear and seal on the new rings? or not hone, so not to remove more more stock than needed? I'm kind'f reading it both, or either way.

 

[Nessism]

Sorry for not exactly understanding. Is it if you use orig. sleeves, pistons, and rings, and they fit good, don't hone. If orig. sleeve, pistons, that fit good, but with new rings, do I hone to get good wear and seal on the new rings? or not hone, so not to remove more more stock than needed? I'm kind'f reading it both, or either way.

New rings require a fresh hone. Old rings don't, although some people do it anyway. Tom Kent used to do a hone with the old rings, or at least I think he did. Too bad he dropped out here. He was a valuable resource.

 

[Suzukian]

Cross hatching of a new motor helps hold oil on the bore while the engine breaks in. The rings will scrap a smooth bore dry. Once broken in, this is no longer an issue. That may be why when people use old rings, on an old bore, they don't re-hatch the bore, it makes no sense to, they are already broken it. A Brass brush will clean off the top of those cylinders, get that carbon off, and the tops of the bores do look like they could use a little more cross hatching.

 

[rphillips]

Got it this time, thanks