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Generally, over time, the compression release will get out of adjustment. Remove the overhead valve cylinder cover (the dead cylinder for twin cylinder engine) and adjust the compression release with the cylinder at TDC. Loosen the adjuster locks and set intake valve clearance to between .004in. and .006in. Adjust exhaust valve clearance to between .008in. and .010in. Takes about 3 minutes to do this!

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Q: What could be wrong with a Briggs and Stratton 15 hp engine that won't idle kicks back on starting but runs well at speed. Note - had new carb - fw key is ok head has been decoked and valves set.?
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