Engine Losing Power

Davejaylyn · 03-23-2009, 07:18 PM

The engine on my 1884 Marathon loses power when the muffler is connected. It seems like a restriction in the muffler but when I hooked the muffler up to the exhaust on a shop vac there seemed to be plenty of air flow. Am I missing something or are these engines affected that much by exhaust pressure??? What else do I need to check??

ruredy · 03-23-2009, 07:29 PM

2 strokes depend on the exhaust working right for it to run correctly.
just curious, how many psi will your shop vac put out?

Davejaylyn · 03-23-2009, 07:58 PM

Not sure on the shop vac psi but doubt it is very high, just high flow. I'm new to the 2 cycle world and thought I would check around before spending money on a new muffler. BTW, the engine compression is 100 psi.

Thanks for any advise you can give.

pizzamaker · 03-23-2009, 08:00 PM

Quote:

Originally Posted by Davejaylyn

Not sure on the shop vac psi but doubt it is very high, just high flow. I'm new to the 2 cycle world and thought I would check around before spending money on a new muffler. BTW, the engine compression is 100 psi.

Thanks for any advise you can give.

100 is gettin on the low side

ruredy · 03-23-2009, 08:18 PM

You can barbecue your muffler to burn it out, I believe there are some threads about it if you search. basically build a big fire and put your muffler in it, burns out all the built up oil/soot.

Davejaylyn · 03-23-2009, 09:53 PM

Thanks for the advise. I guess it's time for a BBQ.

Jricherson · 03-24-2009, 08:01 AM

I have drilled some holes in the muffler above the original outlet and it helped a lot. Give you some time before ordering another muffler and the sound is a lot deeper and I like it.

Davejaylyn · 03-24-2009, 05:15 PM

Thanks, I may have to try that if the BBQ is no good.

pizzamaker · 03-24-2009, 05:25 PM

Quote:

Originally Posted by Davejaylyn

Thanks, I may have to try that if the BBQ is no good.

just remember that you need a very hot fire for this to work! start a fire and get a good bed of coals, when more wood, the muffler, then some more wood and let it cook for an hour or more.let it cool all the way off and then keep tapping it on a hard surface to knock loose any crap thats left over and shake it out.

Flintrock · 03-24-2009, 07:42 PM

I used the burner from my turkey fryer, worked great! Got red hot and shot fire for 30 minutes.....

03-23-2009, 07:18 PM	#1
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7	Engine Losing Power The engine on my 1884 Marathon loses power when the muffler is connected. It seems like a restriction in the muffler but when I hooked the muffler up to the exhaust on a shop vac there seemed to be plenty of air flow. Am I missing something or are these engines affected that much by exhaust pressure??? What else do I need to check??
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7

03-23-2009, 07:29 PM	#2
ruredy Born Wild Join Date: Mar 2007 Location: Clover SC. Posts: 5,552	Re: Engine Losing Power 2 strokes depend on the exhaust working right for it to run correctly. just curious, how many psi will your shop vac put out?

03-23-2009, 07:58 PM	#3
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7	Re: Engine Losing Power Not sure on the shop vac psi but doubt it is very high, just high flow. I'm new to the 2 cycle world and thought I would check around before spending money on a new muffler. BTW, the engine compression is 100 psi. Thanks for any advise you can give.
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7

03-23-2009, 08:18 PM	#5
ruredy Born Wild Join Date: Mar 2007 Location: Clover SC. Posts: 5,552	Re: Engine Losing Power You can barbecue your muffler to burn it out, I believe there are some threads about it if you search. basically build a big fire and put your muffler in it, burns out all the built up oil/soot.

03-23-2009, 09:53 PM	#6
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7	Re: Engine Losing Power Thanks for the advise. I guess it's time for a BBQ.
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7

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03-24-2009, 08:01 AM	#7
Jricherson Not Yet Wild Join Date: Mar 2009 Posts: 14	Re: Engine Losing Power I have drilled some holes in the muffler above the original outlet and it helped a lot. Give you some time before ordering another muffler and the sound is a lot deeper and I like it.
Jricherson Not Yet Wild Join Date: Mar 2009 Posts: 14

03-24-2009, 05:15 PM	#8
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7	Re: Engine Losing Power Thanks, I may have to try that if the BBQ is no good.
Davejaylyn Not Yet Wild Join Date: Mar 2009 Posts: 7

03-24-2009, 07:42 PM	#10
Flintrock Raised by coyotes Join Date: Nov 2008 Location: Central Texas Posts: 5,658	Re: Engine Losing Power I used the burner from my turkey fryer, worked great! Got red hot and shot fire for 30 minutes.....

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