_____ then the problem is that the compression release is not activating because the valves are out of adjustment. ... 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. 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. We offer same-day shipping on these cams. Update Bought this in October of 2018 and used the mower a few times to mulch leaves. 14 Thoroughly clean and then oil cylinder bore. An opposed twin IS NOT 2 singles on a common crank! 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. I started it today 3/16/19 for the first cut of the season. 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 … The notch on the piston must face the flywheel side of engine, Fig. 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. Briggs & Stratton keeps making their engines and parts cheaper but they are loosing the quality that made them one of the best known brands. Page 149 NOTE: Briggs & Stratton opposed twin cylinder engines use pistons with offset piston pins. We always stock 12HP Flathead, Twin Opposed Flathead, Billet Single and Twin Intek, and Twin Vangaurd camshafts. I have a 20 hp intek v-twin, and a 19.5 opposed twin, they run right together on speed and power. If you ever treat any twin like a single, your screwing the pooch! 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. If you run another engine type, just send us your blank. 14. 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. What it does is open the valve a little early to allow excess compression … Whatever is cheaper. 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. New for the summer - we have found some "mow" horse power for your Briggs Intek single with the PC-440! NOTCH FLYWHEEL SIDE Fig. This prevents excessive compression during engine starting. 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. V-twins start a little easier with the compression release. Opposed is a little simpler, very common, and little cheaper. These opposed engines did not have a compression release and at that time leak down tests were not a common practice. The Briggs opposed twin has "easy spin" compression release. It's a slight raising, or bump, on the lobe of the camshaft. 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