B&S 281707 won't start

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  #1  
Old 08-22-14, 12:41 PM
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B&S 281707 won't start

Model 281707 041501 89103131, on a Murray Mower, No Start

New piston and rod was put in by previous owner, I added a new
carb and coil but no start, pops a little and muffler gets warm.
Compression is at 55 psi. I think that is good?

Is there a way to check and confirm correct valve and ignition timing
without tearing the engine apart?

Any other suggestions welcome.


Thanks, Bill
 
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  #2  
Old 08-22-14, 04:01 PM
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I'd be suspicious if the previous owner put in a piston and never got it to run. You can probably open it up and reuse the gasket since it hasn't been run.
 
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Old 08-22-14, 05:03 PM
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You can check it by rotating the engine by hand with the valve cover off and spark plug out. Turn it clockwise until you see one valve close at the same moment the other begins to open. Any movement one way or the other means one or the other valve is opening. This is where the valves "rock". If the camshaft is timed properly, the piston will be at TDC at the same exact moment that both valves are closed between the "rock". You can feel the position of the piston by putting a drinking straw in the plug hole and feeling it travel while you rotate the engine.
 
  #4  
Old 08-23-14, 04:27 AM
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Originally Posted by BillRigsby
". . .Compression is at 55 psi. I think that is good? . . ."
Did they put new rings in too ? (or any rings ?)

Did it ever run since the piston was changed ?

Was this unit left outdoors, and exposed to the elements (with the air filter off) ?
 

Last edited by Vermont; 08-23-14 at 05:43 AM.
  #5  
Old 08-23-14, 09:38 AM
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Yes new rings with the piston, no never ran because the carb was shot, stored inside.I'll have to look at the engine when I get home but I can't say I've seen a valve cover, not sure if this is OHV, but I know if I take the carb and muffler off I can see the valves. Is there a way to check that the ignition timing is correct also?
 
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Old 08-23-14, 10:20 AM
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On that model, the valve cover is also the breather... behind the carburetor on the block. You can take it off and observe the valves, or take the head off and see them from there. Ignition timing can't be changed. If the flywheel key is sheared, the ignition timing is off, but that's the only thing that would really affect it.
 
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