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Old 02-25-2017, 04:34 AM   #11 (permalink)
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Usually, even for larger motorcycles, they try to keep a 2ft length, just to prevent the flame from going back to the valves in case of lean burn.
The diameter really depends on the CC.
For a 300cc single cylinder, the tube dia should be about 1 inch; so I presume that 3/4 would be good for a smaller one.

You can get cheap mufflers online, but should you have the time to make one, just drill a hole in a 6-10" dia tin can (off center) on both the entry and exhaust side, stuffed with rockwool, and chicken wire to keep it at it's place (or a perforated pipe), and weld the can on the exhaust pipe.

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Old 10-09-2017, 01:56 PM   #12 (permalink)
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Ever get around to building this?
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Old 10-09-2017, 03:09 PM   #13 (permalink)
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I got the bigger 17.5kw generator so it's not crucial.
I would like to build it at least so the CO goes up and away from people.
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Old 11-28-2017, 12:15 AM   #14 (permalink)
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My 17.5kw is broke down, so this is definitely back on the table.
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Old 11-28-2017, 03:00 AM   #15 (permalink)
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That sure is a lot of juice you're using. 17kw is about the max I could draw at home (heaters, oven, and everything else). 7kw would be enough to run the place as long as I payed attention to what was on at any given time.

I wouldn't want to pay the fuel bill on either, though!

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