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I have an xmark tractor with a Briggs & Stratton 25 HP intek v-twin engine. The engine turns over very slowly and usually just stops after about a half turn when trying to start on battery voltage alone (either its own battery or when jumped to a non-running car). If I jump it from a running car, it usually starts right up. Sometimes, however, it does turn over slowly and stop even when jumping from a running car. Another hit of the key usually gets it going in this situation. Any ideas what my problem could be? I'm thinking that the decompression feature is not working properly. How would I go about checking/adjusting this? I have also seen a couple of reports here where a new starter seemed to fix a similar problem. My plastic starter gear has stripped off all its teeth once and the new one seems to be getting beat up a little already, so it seems to me that that my engine must be harder than it should be to turn over rather than my starter being weak. Any thoughts on this? Thanks,

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I feel you are in the ballpark with the decompression feature. The Inteks have them alright. The best way to get the feature to work correctly is very simple. Adjust the valves. Just pull the valve covers off and set the valve lash.Torx head screws and locknuts are on the rockers. It isn't real hard. That should "enable " the compression release feature and possibly eliminate your starting problem.
One the engine hits about 300 RPM, the compression release feature is disengaged and no longer a factor.
Intake and exhaust valve clearances for your particular model are available on the Briggs and Stratton website if you look around.

Posted on Aug 27, 2010

  • Roy Cagle
    Roy Cagle Aug 27, 2010

    For the correct adjustment of the valve lash and operation of the compression release, the piston must be 1/4" below TDC on the compression stroke when the valves are adjusted.

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