VF4 is a standard engine. VF4D is a "Heavy Duty" engine, as designated when manufactured, and has Stellite valves, and hardened valve seats. The "D" version is better for todays unleaded gas Wisconsins are notorious for valves getting stuck if they've been sitting around. Before purchase, pull the plugs, shine a flashlight down the plug holes, and make sure you can see the valves opening and closeing when turning the engine over.Get a Wisconsin owners and parts manual. there are a hundred listed on e-bay,search under "Wisconsin Engine Parts". The manual says to pull plugs and squirt oil down valve stems, before storeing. If your engine has a magneto, parts,by magneto model number, are redily available from This, Y/T website, or "Branson Magneto", at www. branson enterprises.com. Carb kits and gaskets are available from NAPA auto parts. Wisconsin motors are still in business, making engines, and parts are still available from them, through the distributors, but priced as if they are gold.
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