Save 3.5 hp tecumseh engine to get e-mail alerts and updates on your eBay Feed.+ Tecumseh Mower 6.5 HP Engine Tappet Valve Cover Used In Good Condition 37684.Small Valve Maintenance & Repair. Valves control the flow of fuel vapor into the combustion chamber and the flow of exhaust gases leaving the engine. Faulty or dirty valves may stick and can develop pits, cracks or grooves that cause the engine to lose power and fuel efficiency.
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