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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles



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Old 05-13-2012, 08:53 PM   #1
sontag1
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Location: Central Arkansas
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Default Replacement Muffler?

I have the 1982 G1 (2 Stroke). I have done the Muffler BBQ, but I still hear stuff rattling around inside of the muffler. I thought I might replace it if the price is not too costly.

Are there any after-market mufflers that are affordable?
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Old 05-13-2012, 09:01 PM   #2
Mrrogers24
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Location: Peachtree city, ga
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Default Re: Replacement Muffler?

Nope, that motor relys on the back pressure from that exhaust. Ive heard of people putting a banshee exhaust on it but im not sure the work to do that mod out-weighs the benefits. Did you lightly bang on the exhaust to get all the crap outta there? Are you sure the noise is from the exhaust and not the clutch?
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Old 05-13-2012, 09:55 PM   #3
sontag1
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Default Re: Replacement Muffler?

Thanks for the quick reply.

Yeah, it is the exhaust. I have everything apart right now going through the top end and replacing the crank seals. The muffler is off and when I shake it, I hear stuff rattling around.

I have read about cutting the end cap off, completely cleaning out the body of the muffler, and welding the cap back on. I am going to go that route, I am not much of a welder, but I am great with a grinder. I would need to pay someone to weld the cap back on, but it would have to be cheaper than buying a new muffler.

The exhaust pressure determines how much oil is injected into the gas/oil mixture. From the SM:

In short, the frequency of plunger stroke
(the frequency of oil discharge) is in proportion
to the engine rpm, and the
plunger stroke (the discharge of oil) is
controlled according to the engine load
(the exhaust gas pressure).
This means
that the engine always receives an
optimum amount of oil.
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Old 05-14-2012, 07:25 AM   #4
slonomo
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Default Re: Replacement Muffler?

I put the Plowman's performance G1 muffler on mine. It didn't really feel like it gained any power, but I went from 19 mph to 27 mph. I also did the jet kit at the same time. It sounds more like a 2 stroke should, but not loud. These poor 215cc golf cart engines just aren't made for power. But, if something in your muffler is "rattling" then that has to be annoying. Surely cutting it apart carefully won't ruin it, so go for it.
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