Jared, The Onan engine on the 2500 is a model: NH-MS 1918C if sn 1446 and prior. If after 1446 then it is a NHC-MS 2313A. As Bob stated it is 22.5 HP. Years ago at least, parts were expensive for the Onan engines. Just a heads up: Does your 2500 have a curved cover over the hand controls? As a former dealer I hope that all these machines had this cover installed for safety. Gehl tried to make sure these kits were installed but I have seen them without. Your Gehl dealer can get one. Chuck
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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