I had my valves resurface, should I still use them?...

pdxxs650 · Nov 7, 2013

After reading posts about engine rebuilds on this site, I had the opinion that grinding the valves and cutting the valve seats was optimal. And after getting that done at a machine shop($20), I've read a couple posts saying lap only unless necessary. Search : stellite -on this forum.
They are all in spec with the manual, should I still use these valves? :doh:

TwoManyXS1Bs · Nov 7, 2013

Hey, pdxxs650. If you're concerned about maximum longevity, new valves are the way to go. But resurfacing valve faces and stems is acceptable for average street riding. The valve faces may pocket after 8-10k miles, but I'd rather have the valves wear out than the seats...

TwoJugs · Nov 7, 2013

Seems that a shop cutting vavles and seats should do the complete job including the lapping if needed. Then again, a $20 vale job?

angus67 · Nov 7, 2013

I paid 60$ for grind and lap.

pdxxs650 · Nov 8, 2013

Actually I had a first oversize bore, head cleaning and valves/seats - $130, but the valves and seats portion was $20-30.

cooldude · Nov 8, 2013

pdxxs650, it looks like you're talking about this thread. Twomany you say that "You can safely grind off a couple thousands (.001") and still have the stellite surface"

If you have the valves resurfaced will they always take off enough to lose the hardened surface?

If he is building for average street riding and uses them for several thousand miles, what would you look for to know they need to be replaced?

TwoManyXS1Bs · Nov 9, 2013

Hardfacing gives these engines longevity. Tappets banging on valve stems require it. Valve faces last longer with it. This thread shows what can happen when the hardfacing is compromised:

http://www.xs650.com/forum/showthread.php?t=28536

Here's a little ditty on stellite:

hard_y_rd · Nov 9, 2013

angus67 said:
I paid 60$ for grind and lap.

Ha ha, that's kinda funny. $60 bones is pretty good for a "grind and lap"

5twins · Nov 9, 2013

Ugly girl maybe? The kind with a few bruises (from being poked with 10 foot poles).

xjwmx · Nov 9, 2013

I see reason to trust TooMany on this and if they're going to do what he predicts, I would look for new respectable ones. Your valves are skanks, to keep the current theme.

I had my valves resurface, should I still use them?...

pdxxs650

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TwoJugs

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angus67

Welder's penetrate deeper!!

pdxxs650

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