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I'm wondering about the one versus two caps. When looking at the john deere z225 parts diagram - its interesting they list two engine versions. In the first version (21 Engine MM14747, MM14593 ( - 040000) ) they reference a qty of 1 for the valve cap, but in the second engine version the qty is...

Thanks for the feedback. Has anybody had a similar experience where the cap fell off and did make its way out of the valve compartment and into the engine ? Just trying to rule out the possibility I didn't notice it falling out when I opened the valve cover.

Need some advice. I have a B&S 18.5 OHV on a Z225 zero turn. Long story short it died - and when I removed the valve cover one of the valve caps was missing. I assume both valves have a cap since the one that was missing had a huge gap. The reason the cap likely fell off was the valve rocker...