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Discussion Starter #1
When I'm running the tractor, quite often, it looses 75% power, and the exhaust sounds weird. Sort of muffled.
When I back off on the throtle, it clears up and runs fine for a while.
I was thinking it might be a sticking exh valve, but I noticed, when the motor is off, and I bang my hand on the muffler, a baffle rattles round inside the muffler. It sounds like it is near the outlet end. I believe it's an orig. WH muffler.
I'm wondering if the loose baffle, could move, and cut off the exh. flow?

I'm very close to cutting the end off the muffler and taking a look, but thought I would ask if anyone has had a problem like this.

The next time it happens, I think I will try to stop and put in neutral, and feel the exhaust pressure, with my hand.
 

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I think you are on the right track. If the exhaust gets restricted, it will kill the power, like the old potato on the exhaust pipe trick.
 

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My guess is the exhaust valve clearance is too tight and tightens up more when hot so the valve is not 100% seated.

Garry
 

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Discussion Starter #4
My guess is the exhaust valve clearance is too tight and tightens up more when hot so the valve is not 100% seated.

Garry
If that were the case, it wouldn't start running ok, after reducing throttle for 2 seconds.
 

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Discussion Starter #5
I think the next time it does it, I will try to stop, and put in neutral, without reducing throttle, and feel if the exh. has much pressure (flow)
 

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i would check the baffle in the muffler ..I had one that the baffle would move every-once in awhile and cause this prob ....It was driving me insane
 

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Discussion Starter #9
So, today checked valve clearances. perfect.
So, I cut her (muffler) apart today, and found the bottom half of the inlet tube, which is capped off, on the end, and has a ring of holes around it, to allow exh. gas in, was busted off. Looking in the incision, I could see the outlet tube, which, I think would be blocked by the broken tube, when the tube bounced the right way.

I closed her up, with the wire welder. (see Dear, I did need to buy the welder) No picture of the welding!

10 minute test ride ok. Time will tell.
 

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