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Remove the valve covers look up your valve clearance specs turn the engine by hand until the piston is at top dead center then go 1/4 turn past that and then put a feeler gage for the valve clearance you need for that valve and snug up the adjustment nut. Check your oil when your done some oil will spill out when opening the valve cover.
Though the valves are adjustable, in a grinding cutting kind of way- they require the valve be removed from the block to do so. So no actual adjuster. The good news is, this "L head" engine doesn't have the same issues as the OHV family and rarely ever need valve service at all. Are you having difficulty Technical Support ' Hotmail Support
Remove the cover for the valves by the spark plug and adjust both valves at .008 gap That will end the back firing. They have locking nuts (double nuts) at each valve to adjust
Could use more info but here are some things u can check--Plug wire grounding to block, old spark plug--check head bolts for correct torque--carb adjustment or jet plugged-governor linkage not hooked up or improper adjustment of governor--if these are good then it could be internal--bad valves and valve adjustment--timing gears
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