this ^^^^^^^^^^^^^^
thanks Bill
thanks Bill
damaged piston/cylinder? husqvarna 254xp
- Thread starter MartDalb
- Start date
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I think Bill and Eric have it right. Something in the carb is allowing too much fuel to pass through the metering gauge. You need to start from scratch. Pull the plug out and flip saw upside down over head. And pull the starter rope a few times to drain case. Let it sit upside down with the piston at TDC or as open as possible to dry. Then disconnect fuel line and force a eye dropper full of mix down the plug hole or carb. Give it a few pulls and see if it pops and runs away burning the dropper of fuel off. I've had a few that won't pop until case is "dry" of liquid. I've had a few that were locked so bad you thought they were seized. Drain dry and start....fix metering level and off we go
If theres a chance that it might be the ignition coil i will order a new. Im guessing it is the original one still on. Looks old. I spend more money on the repair than i should already. Might as well learn from it and get it working now.
Sorry. I didn't read post from start. Have you looked at piston and cylinder?
Compression check. Confirmed spark/timing/keyway (flywheel) ?
Open and upside down to drain or just "open" . gas will vaporize....oil...not so much
back to basics.. compression spark fuel... if you have compression and you have fuel... flooded or not flooded... then it must be an issue with spark. either the ignition coil is bad, wire is bad, somehow its "off" all the time because of a short, or the timing is off possibly due to a sheared key.
flooded can look like no spark... which is why we were chasing that. dump all the fuel out the cylinder head ...with the spark plug out, turn the saw upside down and rotate the piston through several revolutions with the starter. if fuel comes out, thats good. at least its getting fuel. could be too much. what you tested earlier with the fuel line pinched was if it was indeed too much. one of the first things I do when I put a saw together, before I put gas in it, is put brake cleaner down the throat ...in the air horn...just a couple squirts. try to start it. if it pops, you know you have spark and compression. so, do the same thing. if you don't get a pop, and you KNOW you compression, then you gotta investigate the spark issue.
timing, spark plug gap, bad wire, bad coil ... lotta issues
flooded can look like no spark... which is why we were chasing that. dump all the fuel out the cylinder head ...with the spark plug out, turn the saw upside down and rotate the piston through several revolutions with the starter. if fuel comes out, thats good. at least its getting fuel. could be too much. what you tested earlier with the fuel line pinched was if it was indeed too much. one of the first things I do when I put a saw together, before I put gas in it, is put brake cleaner down the throat ...in the air horn...just a couple squirts. try to start it. if it pops, you know you have spark and compression. so, do the same thing. if you don't get a pop, and you KNOW you compression, then you gotta investigate the spark issue.
timing, spark plug gap, bad wire, bad coil ... lotta issues
Giving up is not part of the analysis. Sorry. Nothing gets learned by giving up. This is just a cross word puzzle to us. We like a challenging puzzle.removed cylinder and checked, cleaned it etc. Still nothing, not a fart of anything.
Slowly giving up on it
Isolate spark fuel combustion and air systems one by one. Easy peasy.
Thanks for clearing all that up.
Timing... Will try to set up a wheel if needed
Conpression, hum. Can't test it properly. Only assume its good, as ive changed seals etc.
Plug gab, its a brand new plug, will check if its similar to old.
Wire, there is a slight tear in the grounding wire on the ign. Coil. Issue?
Ign. Coil. Can't test any further then seeing a blue spark. Might be weak spark... Trying to find a replacement for it now, seems a bit rare for the XP model.
Timing... Will try to set up a wheel if needed
Conpression, hum. Can't test it properly. Only assume its good, as ive changed seals etc.
Plug gab, its a brand new plug, will check if its similar to old.
Wire, there is a slight tear in the grounding wire on the ign. Coil. Issue?
Ign. Coil. Can't test any further then seeing a blue spark. Might be weak spark... Trying to find a replacement for it now, seems a bit rare for the XP model.
Assuming you have the first three, checking for a sheared flywheel key would be my next check.
malk315
Running Saws for Therapy
Quite a pinch on that kill wire.
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Sent from my XT1585 using Tapatalk
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