Slightly loose exhaust valves

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8/22/2017 6:01 PM

So I'm going over my bike a little tonight and the exhaust valves are just out of spec on the loose side (2014 KX250F spec .17-.22mm) I'm at .23

Now I have a race this weekend and I've never shimmed valves before but don't want to miss the race. I'd hate to tear into it further and run into issues and not be able to get the bike back together for the weekend. How bad is it to run the bike as it is and deal with it next week when I have 2 weeks before another race?


8/22/2017 6:54 PM

And shouldn't the tolerances get tighter not looser? My last valve check I have them written down at .022.

Oddly enough there is a marking on the cam cap that says 23 in marker, maybe the engine builder set them at .023 and I mis measured last time?

Now I'm confused lol.


8/22/2017 7:06 PM

Run will be fine.


8/22/2017 7:43 PM

They will tighten up its fine if it starts and runs good. Just less valve lift


8/22/2017 7:56 PM

Run it ,as it will be fine....

Paw Paw


8/23/2017 6:13 AM

.01mm is neglegable. Go for it


2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

8/23/2017 8:13 AM

Thanks for the peace of mind guys.