Exhaust and intake mods?

[Vdub]

I'm looking for cheap and easy exhaust/ intake performance mods. Keep in mind I do live in a neighborhood so it can't be too loud thanks! FYI I have a blue greyhound Honda clone 6.5hp


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[chancer]

I use a k and N style air cleaner and intake adaptor. From Agk and a larger jet. Cut the flange of the stock muffle and bend a 3/4 gas pipe 90 deg to point out the back. then weld on a cheap Briggs 5hp muffler from ebay. Sounds good but not realy loud. easy peasy jananeasy.

 

[Vdub]

Just curious what would happen if I ran it straight out of the engine? Or just cut the pipe at the closest area on the stock muffler and just use that piece of pipe?


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---------- Post added at 02:46 PM ---------- Previous post was at 02:46 PM ----------

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[chancer]

I just did this. That piece of pipe on the stock muffler is not exactly round due to the way they put the bend in it. it was easier to just clean up the flange and use only it. I will post a pick here in a little while.

 

[Vdub]

Ok cool thanks. So basically what you saying just too confirm is it's easier just to run it straight out with no pipe?


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[chancer]

No. more like this. Except this is a Briggs threaded in pipe. I will get a pic of my Greyhound with the Flange

 

[chancer]

Here is what I did. Using only the stock flange. I have a pipe bender but you could use Gas pipe and threaded 90* elbow. The Muffler is Male threaded so I used a Rigid EMT threaded coupler welded to my pipe. The emt is steel compared to a cast gas fitting.

 

[chancer]

or I just found this 20 bucks on ebay
http://www.ebay.com/itm/like/291651681055?ul_noapp=true&chn=ps&lpid=82
or
http://www.ebay.com/itm/MUFFLER-FOR...089864?hash=item1a0b33bd48:g:HtoAAOxyzfNRyRgB

 

[OzFab]

Wait, wait, wait... the engine on my kart has a GX140 head, which has a smaller exhaust port than a GX200 head & I used 1" tube which has an ID of 7/8"; using 3/4" pipe on a larger port will be restrictive &, therefore, defeat the purpose of "increasing performance"...

FYI: larger engines have larger exhaust headers, you may just need to redrill the stud holes...

Simply put, a straight pipe of any description will be loud, you will need a muffler of some description; for neighbourhood use, a "low tone" muffler is more desirable IMO...

 

[chancer]

Correct. However I used "3/4 Gas Pipe" which is actually 1"OD and 7/8 ID. In my case it was still an improvement over the stock pipe leading to the restrictive stock muffler. They put such a tight bend on the stock pipe it is ovaled, and even smaller than the 7/8ID I actually used. So In my opinion still an improvement.

 

[OzFab]

I was leaning more towards the items in post #8; your advice is sound...