Thirty years ago, when that engine was built, most mechanics went by a common practice on Briggs L-Head engines was to look for a compression reading of 125-140 PSI. NOTCH FLYWHEEL SIDE Fig. I have a 20 hp intek v-twin, and a 19.5 opposed twin, they run right together on speed and power. Update Bought this in October of 2018 and used the mower a few times to mulch leaves. The company reports that it has 13 large facilities in the U.S. and 8 more in Australia, Brazil, Canada, China, Mexico, and the Netherlands.The company's products are sold … If you run another engine type, just send us your blank. ... how to adjust the valves on a 19.5 horsepower briggs & stratton flathead opposed twin engine ... Briggs and Stratton Twin Model 422707 Type 122902 Code 93022 553 Engine must be partially rotated before starter will spin engine. Most of the overhead valve engines have a compression release feature that allows for the starter to not have to work hard to crank the engine. I have run compression tests on many Briggs V-Twins with properly adjusted valves, the readings are generally in the 120 -135lbs range, 50 - 75 lbs is low for an OHV engine, I don't think Briggs made any 26 hp engines that were the opposed twins so without the model number of your engine I am making the assumption that it is a V-Twin OHV engine. Briggs & Stratton keeps making their engines and parts cheaper but they are loosing the quality that made them one of the best known brands. An opposed twin IS NOT 2 singles on a common crank! The Briggs opposed twin has "easy spin" compression release. Page 149 NOTE: Briggs & Stratton opposed twin cylinder engines use pistons with offset piston pins. then the problem is that the compression release is not activating because the valves are out of adjustment. The intake lobe on the camshaft is designed to hold the intake valve slightly open (1/100 of an inch) during a portion of the compression stroke. _____ This prevents excessive compression during engine starting. It's a slight raising, or bump, on the lobe of the camshaft. If you ever treat any twin like a single, your screwing the pooch! V-twins start a little easier with the compression release. Briggs & Stratton Small Engine Specifications ... Specs for Briggs Twin Cylinder Engines: Specs for Intek V-Twin: Trouble Shooting Carb & Compression: Briggs Starter Reference: Crankshaft Drawings: Vertical Shaft Engines: Horizontal Shaft Engines: 10A900 10B900 10C900 10D900: It solved the problem of the broken compression release. Opposed is a little simpler, very common, and little cheaper. We always stock 12HP Flathead, Twin Opposed Flathead, Billet Single and Twin Intek, and Twin Vangaurd camshafts. Whatever is cheaper. Briggs & Stratton Corporation is an American Fortune 1000 manufacturer of gasoline engines with headquarters in Wauwatosa, Wisconsin.. Engine production averages 10 million units per year as of April 2015. The secret to running multiple cylinder engines, whether it is a mower engine or a top fuel drag engine, is to get the most out of each cylinder as well as making sure that each cyinder compliments the others. We offer same-day shipping on these cams. New for the summer - we have found some "mow" horse power for your Briggs Intek single with the PC-440! These opposed engines did not have a compression release and at that time leak down tests were not a common practice. I started it today 3/16/19 for the first cut of the season. 14. What it does is open the valve a little early to allow excess compression … The notch on the piston must face the flywheel side of engine, Fig. 14 Thoroughly clean and then oil cylinder bore. 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