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Have a D170 with 69 hrs on it. Yesterday while mowing grass engine suddenly got a bit louder and now has about 70% of the power it had before. Put gas in it checked the oil ( fine still clear and no smell of gas in it). Let it sit, today I checked the plugs 9 see pic) and gapped and changed them and still have the same issue. Any ideas? BTW this is the B&S 25 Hp engine.
 

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Have a D170 with 69 hrs on it. Yesterday while mowing grass engine suddenly got a bit louder and now has about 70% of the power it had before. Put gas in it checked the oil ( fine still clear and no smell of gas in it). Let it sit, today I checked the plugs 9 see pic) and gapped and changed them and still have the same issue. Any ideas? BTW this is the B&S 25 Hp engine.
What kind of louder sound are you talking about?
Check the exhaust system for damage or missing parts. If either pipe came off the cylinder head or the gasket in between them blew out. You will get extra exhaust noise and a reduction in power. The down pipes could have also cracked off the muffler

If you are getting an internal engine noise it could be any number of problems. Like a loose rocker arm or a bent push rod. Either problem would definitely give you a reduction in power.
 

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What kind of louder sound are you talking about?
Check the exhaust system for damage or missing parts. If either pipe came off the cylinder head or the gasket in between them blew out. You will get extra exhaust noise and a reduction in power. The down pipes could have also cracked off the muffler

If you are getting an internal engine noise it could be any number of problems. Like a loose rocker arm or a bent push rod. Either problem would definitely give you a reduction in power.
The engine is running louder, exhaust system is not compromised, no smoke, no strange noises. Just louder.
 

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The engine is running louder, exhaust system is not compromised, no smoke, no strange noises. Just louder.

First off them plugs look to be burning good.

Can you post a video? Describing noise is hard to do.

Are you sure that the noise is coming from the engine? When you say 70% power are you talking over all or just the driving? I'm wondering if something happened to the belts, deck or transmission to make the engine work harder thus increasing the noise from the engine.

I see you have very low hours on the clock. Is the machine still under warranty? If so have your local dealer take a look.
 

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I dropped it off at the dealership today so no video. The mechanic who initially pulled it off the trailer was baffled too he also commented the engine sounded "tinny" but it starts and runs just fine.

It is 26 days out of warranty:nunu: it will be interesting to see what it is and I will keep you posted.
 

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I wish I could say I never saw failures on those engines. Mostly they happen pretty quick. With in the first 10 or so hours. Rare to see one fail after that but it does happen. Of course this is saying if it is in fact an internal problem. Most later hr failures are caused by oil leaks. Lack of lubrication causes tell tale signs that will be noted.

Sent from my LGL52VL using Tapatalk
 

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Ended up being the PTO had a broken piece and it was slipping. No warranty coverage but bill was $187 parts and labor.
 

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Ended up being the PTO had a broken piece and it was slipping. No warranty coverage but bill was $187 parts and labor.
Glad you got it fixed.
 
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