2021 Yamaha FX HO Jet Ski– RPM drop issue

2021 Yamaha FX HO – RPM drop issue

I ran my ski yesterday for the first time in about 3 months and noticed a strange RPM issue.

While cruising at ~4,900 RPM (~30 mph), the RPMs drop to around 4,500 for about a second, then jump back up. This happens roughly every 20–30 seconds. When I slow down to idle, it seems to idle a bit high and inconsistent (about 1,200–1,400 RPM).

Specs / things I’ve checked: • 2021 Yamaha FX HO • 75 hours • Full tank of non-ethanol fuel (about 4 months old) • Air filter is clean • Battery voltage while running: 14.2–14.4V • No warning lights or codes

It ran great 3 months ago the last time I had it out.

Any ideas on what I should check first? Thanks in advance!