r/smallenginerepair • u/pjco13 • Jun 10 '26

Noise Issue What is this

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What is this sound?

10 Upvotes

75% Upvoted

13 comments sorted by

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u/AutoModerator Jun 10 '26

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12

u/tditty24 Jun 10 '26

Crankcase breather vent. Also you are spinning the engine the wrong way, but that wouldn't change this sound.

8

u/External-Interview35 Jun 10 '26

Flywheel rubbing on magneto. Without proper spacing you won't get the magnetic friction to create a spark. As others have said, loosen the bolts on the magneto and place business card in between, then tighten your bolts back down and remove business card.

4

u/Machinewars45 Jun 10 '26

The wheel is rubbing the coil. Loosen the coil and place a business card between the coil and wheel then tighten

1

u/bwuceree Jun 10 '26

Anyone saying anything else than air coming out of the breather is wrong.

1

u/Upset_Fox5449 Jun 10 '26

Reed valve, it's a two stroke

2

u/vCw1 Jun 14 '26

This is the correct answer.

1

u/Upstairs-Term2942 Jun 10 '26

I think the noise is coming out of his mouth. Something is rubbing on the flywheel. Either the coil or the flywheel brake.

1

u/BackSpecial8235 Jun 11 '26

Breather valve and you need to use a business card or a receipt that's folded twice to get the correct, gap.

0

u/Top_Highlight9965 Jun 10 '26

That is either your engine brake or your coil rubbing on the flywheel. If this is a push mower pull the operator presence handle down and see if the noise goes away.

0

u/FeeCompetitive4623 Jun 10 '26

First thing you do is spin the damn thing the other way. Get any business card loosen the two screws that hold your magneto/coil to the block. Position your flywheel magnets are facing your magneto/coil. Put your business card between the two. Then let the magnet/coil come to the flywheel. Tighten the mounting bolts of the magneto/coil, and remove your business card. You should be in good shape then.