Product Description
ARC Adjustable Timing Hub for our Billet Flywheels designed for the Briggs Anti-Vibration System Engines
Model 28/Model 31
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A Must-Have for AVS!
Just because your Briggs mower engine doesn't have the dipstick going through the cylinder doesn't mean your engine isn't AVS. Look carefully at the relationship between the ignition coil mounting towers and the cylinder. If your coil's towers line up with the cylinder, this hub is not for you. If your coil's towers are canted to one side (as you're looking straight down the cylinder bore) then you definitely need this hub. While purchasing a new 6611-AVS flywheel is the way to go (we all swap and trade and purchase older parts from time to time), it is critical that you inspect for these numbers. If they are not present, you can damage your engine from too much spark advance, even if you back the non-AVS hub all they way to the negative.