In an effort to reduce the noise of my scoot I researched the subject and found a bit in Gorden Jennings book that stated; Anyway, I gave the scheme a try, and while certain other modifications prevented drawing any absolute conclusions from the experiment, the bike did prove to be very fast, and it seemed certain that while my “inside stingers” might not offer any real power advantage, they probably were at least as effective as those attached in the more conventional manner. But that is not to say that I did not notice a difference - and the difference was in sound. With those inside outlet pipes, the typical expansion chamber crackle was very noticeably subdued. That made sense, as the chambers' outlet to atmosphere was taken from a point where the pulse was at its lowest amplitude - rather than from the high-pressure area at the tip of the baffle-cone. So I cut off my existing stinger(outlet pipe) and glass packed muffler to see if this would work.Also wanted to add a muffler that I used in the 70's on our woods bikes that proved itself then; Here is the new outlet pipe(stinger) beside the baffle cone;
The stinger welded inside the baffle cone;
Fabbed a can to enclose the baffle cone;
Built the baffle assembly;
And here is the final product,kinda ugly but nice and quiet at lower revs;
Here is a before and after vid sample,quieter with no power loss;
Last Edit: Nov 16, 2017 17:28:10 GMT -5 by 90GTVert
Brent Smoking section, please.
Senna1Rossi: Ah, gotcha! Thanks, Fox. Does everyone see the Shoutbox, or just the people who you choose?
Feb 16, 2016 12:39:35 GMT -5
Fox: Anyone who is logged in can see it but it's down at the bottom so most have either chosen to ignore it or haven't discovered it yet.
Feb 16, 2016 18:42:39 GMT -5
Deleted: Wow, I just found this. I feel smart now, ha ha.
Feb 27, 2016 19:24:24 GMT -5
Silar: Ahh.. New feature for a new riding season! YAY!
Mar 16, 2016 17:12:34 GMT -5
Silar: Apparently this still is not being used much. hmm..
Mar 17, 2016 13:55:04 GMT -5
180°off: Anyone want to buy a Yamaha 2t that needs a complete rebuild?
Mar 27, 2016 16:00:19 GMT -5
larryhobman: What is the leanest jet size you would try on a 47mm setup, 60cc stock head with a A9 cam
Apr 2, 2016 20:17:30 GMT -5
Senna1Rossi: Thanks renagade281!
May 23, 2016 14:59:12 GMT -5
Fox: I don't really know how to say this but straight. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. I know he would want ya all to know this. Thank You Brent for befriending my love he was very happy on here!
Jun 18, 2016 16:26:04 GMT -5
Fox: www.gofundme.com/29mgf6b8 I hope it is ok to pass on his gofundme page link. If not you will un-post it I'm sure. Thanks again all!!
Jun 18, 2016 16:31:18 GMT -5