LA140 B&S 23HP I/C OHV Valve Adjustment ?

5758 Views 6 Replies 5 Participants Last post by MichaelTJD60, Nov 3, 2015

Greg E

Discussion Starter · Nov 1, 2015

Hello. Newbie here. I recently purchased a used 2007 LA140 with the Briggs 23 HP engine. Overall it is in very nice shape but needed a few adjustments. It has the common problem of hard starting, which from reading other threads is valve adjustment related. I've downloaded the L100 Repair manual found here and watched some of the valve adjustment videos on Youtube and am confident that I can do this job. Just have a couple questions.

How do I verify the adjustment spec for my particular engine? I found a document that listed the adjustment spec as .004-.006" for numerous B&S V twin OHV engines but don't know if mine was on the list. I did not see the adjustment spec in my owners manual but maybe I missed it.

Should the valves be adjusted to spec. hot or cold? It seems to be more difficult to restart after it's hot so clearances probably change slightly as heat builds in the engine.

Thanks.

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Greg E

Discussion Starter · #6 · Nov 2, 2015

OK. I did the valve adjustment today. It is cranking much easier now. Before the adjustment it would sometimes stop cranking like there was a dead spot on the starter or a weak battery that couldn't spin the motor. It doesn't do that anymore. The intake valves were about .009" and one exhaust valve was about .010". I was surprised that such a small misadjustment would cause a problem like that but apparently it did. Also it is much easier to restart after it is warmed up now.
Thanks to all that replied.

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