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If you check out the link below you will see your engine basic type is listed but without the suffix though that isn't likely to be an issue as all the Tecumseh OHV engines listed all have the same 0.004" (4 thou) intake and exhaust valve clearance - it is unlikely your engine will be different...
It's not a side valve engine. OHV means overhead valves. Side valve engines are the old style flatheads such as used in '30-'50 era Ford and Mercury cars.
I suggest you look in the owner's manual for whatever equipment this engine powers and it should give you the correct valve clearances in thousandths of an inch, and whether you need to adjust the valves when hot or cold. Cold is the most common.
You'll need at least a feeler gauge, a wrench the same size as the tightening nut on the valve pushrod, and probably a medium size flathead screwdriver to do the actual adjustment. Removing the valve cover may require a wrench or screwdriver depending on the specific engine. All of these tools are available at most hardware stores, Home Depot, Lowe's, Auto Zone, etc. Valve clearances are usually given in a range, such as: .005" -.007" which translates to 5 to 7 thousandths of an inch between the pushrod and rocker arm. Feeler gauges are so marked. Aim for the middle of the range, like .006"
If you've never done this before, I'd suggest you get a competent auto mechanic to do it and watch carefully as it's done. It's not rocket science but does require a certain touch. Once you've seen it done you should be able to to it yourself. This type of maintenance is generally required perhaps once a year if the equipment is not used every day.
Take off the valve covers and check the valve lash. @ tdc on compression stroke then same on exhaust stroke the clearance between the rocker and valve should only be .001 to.003 in.Carefully adjust to this tolerance,may cure your problem. seems this is a common problem.
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