Link to a video of the engine running on Reddit
Any help in diagnosis much appreciated,
Many thanks,
Dave
Any help in diagnosis much appreciated,
Many thanks,
Dave
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Had it since I got it but it might have been getting louder recently - hard to tell. Yes it gets faster with RPMIt almost sounds like a leak in your air pump system. I’m assuming the noise goes faster if the engine rpm increases?
Did it start all of a sudden or has it been growing louder?
it has a real pumping sound to it.
you might try one by one pulling the spark plug wires. And see if any one cylinder quiets things down.
Pull one plug wire at a time with all others still connected, then reconnect and move on to the next. If you do this and all of a sudden the noise gets a lot quieter you've likely found the problem cylinder and also likely confirmed its a bearing issue. Basically without the spark there is no power generating event on that cylinder and the thrust force is removed. There is obviously still movement....so if there is say a hole in your block the noise wont go away but if there is a bearing issue it might get quieter.Had it since I got it but it might have been getting louder recently - hard to tell. Yes it gets faster with RPM
Thanks - I'll try pulling each plug and seeing what happens
yeah it does sound like air pumping but he has no air pump.It almost sounds like a leak in your air pump system. I’m assuming the noise goes faster if the engine rpm increases?
Did it start all of a sudden or has it been growing louder?
it has a real pumping sound to it.
So I started pulling plugs, at one point it stalled, restarted and pulled the choke out a little more, pulled a couple more, could hear the RPM dipping before I reconnected. Then all by itself it just seemed to go away. No noise. restarted to see if it came back. can't hear a thing. Letting it cool now to see if it comes backPull one plug wire at a time with all others still connected, then reconnect and move on to the next. If you do this and all of a sudden the noise gets a lot quieter you've likely found the problem cylinder and also likely confirmed its a bearing issue. Basically without the spark there is no power generating event on that cylinder and the thrust force is removed. There is obviously still movement....so if there is say a hole in your block the noise wont go away but if there is a bearing issue it might get quieter.
Any idea which plug was disconnected when it got quiet. Or did disconnecting one plug cause a stall where another plug was just a rough idle? And just to confirm you’ve only got one plug disconnect at a time so you are always running on 5 cyls right?So I started pulling plugs, at one point it stalled, restarted and pulled the choke out a little more, pulled a couple more, could hear the RPM dipping before I reconnected. Then all by itself it just seemed to go away. No noise. restarted to see if it came back. can't hear a thing. Letting it cool now to see if it comes back
found a bad connection and did a half assed fix on it. wiggling the wires makes it go away, I ordered a new set - thanks!If pulling and replacing all the plug wires got rid of the sound, the problem was one spark plug wasn't firing. The engine was running on 5 cylinders.
Since the bad sound was coming out of the exhaust pipe too when it was happening- that poaunts to a misfire.
When the 2F has a dead cylinder due to no compression or spark, it can set up a rhythmic racket.