i just rebuilt both sides on a twin ohv 20hp - if i can stop this noise id like to. or is it normal? it’s always done it since i got the mower (free). it almost sounds like a squeak coming from under the flywheel. or is this normal on these engines?
Exhaust gasket or muffler leaking? I would apply anti-seize to the muffler bolts and torque to spec. Make sure the gasket is good. Remember that is an aluminum block. Don't need to gorilla slam the muffler bolts.
Something under the plastic engine blower housing rubbing on the flywheel? Remove the engine cover temporarily and run the engine for a FEW seconds only. These are air cooled engines that get hot fast. Don't run without the cover.
While you are there, clean all the dirt, oil, grass and bugs off the engine clock cooling fins. This is in the manual and should be done on ALL small engines.
Sometimes those screens with all those small round holes on top of the flywheel can rub where they shouldn't be, get bent. Look for scratches on the plastic outer cover where the round screen rides.
slomo
i don’t think so but i will check. i adjusted the valves - both to .004 both sides - i will check this again alsoYour ignition coil isn't rubbing the flywheel is it?
I would also check to be sure nothing is rubbing the charging coil underneath the flywheel.
"Hey man I got a problem with my mower" "alright, what's it doing? "Sounds to me like the muffler gasket is leaking or muffler has a hole that doesn't belong. Listen to the video again. Kind of sounds like a dirt bike. It's got a chuffing sound. That is a new word you guys can use LOL. Engine seems nice and smooth. Very well could be a loose coil like Scrub said.
Take a short garden hose and listen around the muffler.
slomo