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I'm not talking about the pamphlet, that comes with a piece of equipment. I'm talking about the mechanics desk reference that the factory mechanic, at the dealership, would use to reference any unfamiliar item, or procedure. This manual would demonstrate the complete disassembly, procedure. Along with the reassembly if it's different. For the entire machine. It's a large book! These things are typically called the shop service manual. You have to ask about it SPECIFICALLY. Because most people don't care enough to ask, they're not that popular. That is, until ten or twelve years later, when they're obsolete, and no longer available. These days they're probably a pdf. You'd want to download that, and print, place in a notebook. So that when everyone else can't find it. You have it. I get one for EVERY piece of equipment, large, or small. Because new stuff rarely breaks down, if it's quality stuff. But when it does, there likely isn't any shop manual available.

What does the exhaust look, & smell like? Unburned fuel? Blowby? Any smoke?

First, be sure what type of fouling you have. https://www.sidexsideworld.com/threads/spark-plug-reading-chart.26012/