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 Honda gx390 exhaust ideas

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matthew sidor
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goesman
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PostSubject: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 24th 2012, 1:28 pm

I am running a Honda 13 HP gx390 that was originally used on a power washer. I am wanting do some thing different with the exhaust. I'm not looking for any thing loud so a quite muffler of some sort would be great. Any ideas
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goesman
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 24th 2012, 1:58 pm

I found this cool kit but its a bit expensive for my liking. http://www.nr-racing.com/exhaust.htm
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matthew sidor
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 24th 2012, 3:36 pm

well thats not a lot but if your not lazy u can make one
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Hillbilly Homer
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 24th 2012, 4:46 pm

$12.00
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goesman
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 25th 2012, 4:11 pm

Nope I am not lazy at all. I liked that one kit for it nice smooth bends and ready to go exhaust flange. I am going to go to Lowes and check out there galvanize conduit bends. I have used them before. I like the idea with the two mufflers put together. Its not to restrictive is it. Thanks
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 25th 2012, 5:15 pm

I like the Tractor Exhaust by NR Racing, im not sure if they make them for the GX390's or if its only for the GX200's. I bought alot of my Parts for my Baja Warrior from there, never bought an exhaust from them though.
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Hillbilly Homer
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeAugust 25th 2012, 6:54 pm

goesman wrote:
I like the idea with the two mufflers put together. Its not to restrictive is it. Thanks

Not at all. i used 1" the stock outlet was less then 1/2.
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeDecember 10th 2012, 7:38 pm

For custom exhaust on the GX390, you will either have to modify the stock manifols to take threaded pipe or build a new axhaust from the flange back.

The exhaust port is not threaded like some of the other engines.

I made a flange out of 1/4" plate, and brazed a piece of 1-1/8" galvinized flex to that, and brazed a piece of 1" conduit to the end of the flex. It exits out the rear under the fender

Be very careful when welding or brazing galvinized, zinc fumes are very very bad for you.
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PostSubject: Re: Honda gx390 exhaust ideas   Honda gx390 exhaust ideas Icon_minitimeDecember 10th 2012, 10:40 pm

5$ for the muffler. Used black iron 3/4" pipe and the flange from the stock muffler. Welded using a Lincoln AC/DC Stick box. It can be done. It will need a lot of test fitting done IF you do it off the tractor.
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