Is there a manual for where the adjuster screws sit from factory?

Yes there is. The factory Briggs and Stratton manual will tell you what to do. In lieu of that, the top screw should be about 1/2 turn out from the lightly seated position and adjusted out more only if it won’t idle. The lower screw should be set at 1 1/2 turns out from lightly seated position. Adjust 1/4 turn in either direction to get to a point where it doesn’t surge. Tightening usually leans the mixture so tighten till it surges and back out until it runs smoothly. Above all, make sure the fuel tank is clean and dry before you add fresh gas and replace the fuel line also.

Someone stated about needing the two M6 screw but anyone know what size?

Length? 18M is 3/4 of an inch, 24M is close to an inch. So measure the old ones for length, and by the equivalent metric. (M6 is a size, like a quarter inch bolt.)

Is this car waranteed if there is a problem.

You're probably not going to love this carburetor. It's definitely a little short, less long, and had metric threads. I'm usually a big fan of cheap replacement carbs, but I bought another rebuild kit for my old carb and I'm going to try it again. It just doesn't fit well enough.

Says pre-adjusted at factory - but is it adjustable if needed?

Yes and most likely you will see to adjust slightly. The high speed adjust meant in the bottom screw on a 45degree angle. The idle low speed is the horizontal one on the top.

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390323 Carburetor Compatible with BRIGGS & STRATTON 394228 398170 194412 190432 190402 195422 190400 170401 7HP 8HP 9HP Engine Lawn Mower Carb with Gasket

390323 Carburetor Compatible with BRIGGS & STRATTON 394228 398170 194412 190432 190402 195422 190400 170401 7HP 8HP 9HP Engine Lawn Mower Carb with Gasket

Product ID: 63862494

🌱Compatible with multiple models

🔧High-quality aftermarket

🧼Includes cleaning tool

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Description

🌟 Upgrade Your Mower Game!

DURABLE DESIGN - Engineered for longevity, ensuring your mower runs smoothly season after season.
COMPLETE PACKAGE - Comes with gasket and carbon dirt jet cleaner tool for a hassle-free installation.
EASY INSTALLATION - Get back to mowing in no time with straightforward setup instructions.
REVITALIZE YOUR ENGINE - Transform your lawn mower's performance with this premium carburetor!
UNIVERSAL COMPATIBILITY - Fits a wide range of Briggs & Stratton models for ultimate versatility.

The 390323 Carburetor is a high-quality aftermarket replacement designed for Briggs & Stratton engines, compatible with a variety of models including 7HP, 8HP, and 9HP. This package includes a gasket and a carbon dirt jet cleaner tool, ensuring a complete solution for maintaining your lawn mower's performance.

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