Help! Noise in my engine

Bange said:
Well, in practice this happens, but when recording with increased RPM, the noise of the discharge increases (mufler), suppresses the TUC TUC TUC ... and it is not very clear.
In the video I forced a low RPM in order to make the TUC TUC TUC clearer ... did you notice?
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Thanks , I did hear.Go to the source with a long dowel or ready rod etc. between the engine case and your ear to check noise/engine rpm relationship.
 
It is my friend, impossible to notice any difference ... by this procedure I would not condemn the gap between the crankshaft and the connecting rod foot (crankpin journal).
But the slack can come from the two other points (mag journal or PTO journal).
 
Bellcrank said:
Thanks , I did hear.Go to the source with a long dowel or ready rod etc. between the engine case and your ear to check noise/engine rpm relationship.
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Let me see if I understand ... do you mean by a big screwdriver with the cable in the ear and the crack in the motor housing (like a stethoscope)? We do this procedure here to detect bearing snoring on car wheels, bearing alternators, air conditioning compressor ... is that it?
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That's what I imagined ... here we always use a long screwdriver ... I'll do it tomorrow morning and post my impressions, but because I don't know a perfect machine, I don't know if it will help.
 
Well, I did the test of auscultating the engine ... not conclusive in the sense of defining the clearance point, regardless of where I place the screwdriver.
One thing that I clearly noticed is that the "tuc tuc tuc" does not increase in intensity with the increase in RPM, on the contrary, it even decreases.
I measured the idle RPM and it is + -1700 (is this normal?) The options are running out and before I open my engine, I still have to hear another one in good condition for a comparison.
 
Bange said:
Well, I did the test of auscultating the engine ... not conclusive in the sense of defining the clearance point, regardless of where I place the screwdriver.
One thing that I clearly noticed is that the "tuc tuc tuc" does not increase in intensity with the increase in RPM, on the contrary, it even decreases.
I measured the idle RPM and it is + -1700 (is this normal?) The options are running out and before I open my engine, I still have to hear another one in good condition for a comparison.
Click to expand...
 
Bange said:
Well, I did the test of auscultating the engine ... not conclusive in the sense of defining the clearance point, regardless of where I place the screwdriver.
One thing that I clearly noticed is that the "tuc tuc tuc" does not increase in intensity with the increase in RPM, on the contrary, it even decreases.
I measured the idle RPM and it is + -1700 (is this normal?) The options are running out and before I open my engine, I still have to hear another one in good condition for a comparison.
Click to expand...
I've read around 1850rpm is low idle speed.

Not good to idle these air cooled engines like a Harley Davidson at 400rpm. You want a full 3200 to 3600 revs for normal ops. Somthing about lack of lube at low revs. Check your manual for proper rev settings.

slomo
 
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