5500 onan gold

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Your Cummins Onan owner manual should help - it's on page 20 of the more recent editions. It's a rather narrow-focus picture of the plugs in the cylinder head, though, so you still have to figure out how to get access to the cylinder heads. The cylinders/plugs both come out toward the front (the access panel), one to the left and one to the right.  You will probably need a universal joint on the ratchet to unscrew the left side plug.

https://www.electricgeneratorsdirect.com/manuals/CO_5500_7000_EVAP_Man.pdf

This "how to" gives some hints:
https://www.justanswer.com/small-engine/6x0b7-access-spark-plugs-onan-marquis-gold-5500.html
 
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