Average compression psi on lawn mower engine

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Old 12-05-15, 04:33 PM
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Average compression psi on lawn mower engine

Is there a general compression test value on a 15 year old lawn mower engine showing the compression is ok?
 
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Old 12-05-15, 05:10 PM
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Hello Rjwig,


Much below 65lbs and the engine will be harder to start and be low on power.....
 
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Old 12-05-15, 05:53 PM
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1. Does it smoke ?

2. OHV or flat head ?

3. Model and type first 4 #'s of the code would help ~!~!
 
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Old 12-06-15, 06:04 AM
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If you are having trouble with the engine I much prefer a leakdown test. A compression test will just provide a compression number. A leakdown test will also show good or bad compression and allow you to determine where a problem lies; blown head gasket, leaking intake or exhaust valve, worn piston or rings or cracked head...
 
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Old 12-06-15, 09:06 AM
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12v802 bs flat head engine

This engine starts pretty well but consumes a good amount of oil. I can't see smoke except at start up (smallish amount) I believe I measured about 65 on the compression test.I'm considering rebuilding it because it is easier to push with bearing wheels and has been dependable.I'll check into a leak down test.
 
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Old 12-06-15, 01:38 PM
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I think B&S used to say if you pulled on the starter rope without your foot on the mower and it started to lift the mower the compression was good. Have a good one. Geo
 
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Old 12-06-15, 06:11 PM
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I have a Troybuilt with bearing wheels and a 6.5 hp Briggs on it. Very easy to push and very quiet.

Look under your the deck and see if the seal is good. That won't be a compression issue but you might see where your oil is going.

Try to use another comp gauge to see if the two match.
 
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Old 12-13-15, 07:37 AM
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mower

Thanks everyone for the input.
 
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