First do a compression test , it must be around 100 psi + depending on compression ratio and carbon build up , if lower than this add 1/2 teaspoon of oil to the cylinder and redo test , if higher rings or cylinder worn , if still low valves not seating or burnt.
SOURCE: my 017 stihl chainsaw stopped working this morning
I would double check the muffler side of the piston and make sure it is not scored up like this:
Remove the carburetor and make sure the intake side of the piston is not worn (missing more than 10% of the machining marks )like this:
If you do not see these failures and you have good spark the carburetor is the problem. see a local dealer like www.arcolawn.com for parts and support.
SOURCE: 1995 bmw 740i ran perfect,
Total loss of compression would mean a bent valve. car would be running very rough if that was the case. Or a blown head gasket .The lack of compression is probably from being flooded.Check the intake if it is FULL of oil then really bad.
It could be the intake valves have gummed-up due to all that oil in the intake. If so, the thing to do is remove the heads, clean, and check for damage. The engine flooded with gas can bring compression all the way down,Gas washes all of the oil off of the cylinders and that's what seals the rings to the cylinders. You spark plugs are most likely gas fouled too.Also other possibility for no compression or low compression is the cylinder walls gets bad thats why no compression car needs a block.
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An engine will not start if it has very low compression. It could be possible that the vehicle is getting flooded with too much fuel causing the cylinder walls to get washed down.
What you should try doing is removing each spark plug and then squirt a small amount of oil (3-4 shots from oil can) into each cylinder and crank it over to re-lubricate the cylinder walls. Then re-check compression. It should jump up and be about double your first reading. If so then re-install the plugs and try to start it. If it does fire up it is going to smoke very heavily for a few minutes due to all the oil in each cylinders. -------- Try this , but if that is not helping then ignition coils needs to be replaced.Also get the spark plugs checked.If dirty fouled up and very old, then replace the spark plugs too.---------- This should help.thanks.Helpmech.
Sounds like your timing is out 180 degrees. Recheck by making sure #1 piston is on the compression stroke, then retime.
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