very cheap, but I'm gonna need to muffle it somehow I'd like a little more sound over stock, but I don't want to be annoying everyone in a 2 mile radius. motorcycle baffle and baffle insulation would keep the noise down?
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Bought a Supertrapp for my GS400/425/450 MAC exhaust, here is how it went.
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midnightcafe
not to hijack your thread, but I'm looking for a similar replacement for my MAC muffler:
very cheap, but I'm gonna need to muffle it somehow I'd like a little more sound over stock, but I don't want to be annoying everyone in a 2 mile radius. motorcycle baffle and baffle insulation would keep the noise down?
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donimo
So, here is a question:
I have a supertrapp pipe and stock jetting, how do I know how many discs to put in to get the pipe in it's "happy place" before I start carb tuning?
I started with 6, seems to run great, tried 5 just for s&g and it seems to tame it own a bit so I am pretty sure going lower isn't right. And 6 is already about as loud as I want it.
So is that ok, anybody with a supertrapp have any tuning advice?
Are 120 jets a good starting place? Stock is 117.5. I will do some official plug chops soon enough, unofficial ones look the same as before, black ring and bottom fading to a dark grey at the top of the electrode.
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I would go with six discs if that 's an acceptable noise level for your ear. Most 4 into 1 (V&H, SuperTrapp) aftermarket manufacturers recommend bumping the main jet by 3 to 4 sizes. Since you are adding a Supertrapp muffler to your stock 400 head pipes bumping the main jet by one size is probably a good starting point. You probably wll have to tweak the air screws etc to get transitions right. When you perform plug chops I would mark the the throttle grip to locate 3/4 open and make sure you reach that point before drawing any main jetting conclusions.
IMO & experience adding/removing one disc has no effect on overall jetting.Steve
1979 GS1000E (45 Yrs), 1981 GPz550 (11 Yrs)
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donimo
Originally posted by srsupertrap View PostI would go with six discs if that 's an acceptable noise level for your ear. Most 4 into 1 (V&H, SuperTrapp) aftermarket manufacturers recommend bumping the main jet by 3 to 4 sizes. Since you are adding a Supertrapp muffler to your stock 400 head pipes bumping the main jet by one size is probably a good starting point. You probably wll have to tweak the air screws etc to get transitions right. When you perform plug chops I would mark the the throttle grip to locate 3/4 open and make sure you reach that point before drawing any main jetting conclusions.
IMO & experience adding/removing one disc has no effect on overall jetting.
so just to confirm, mark throttle at 3/4 and make sure to go at least that high (not WOT?) then kill the engine and pull the plug?
also I have heard conflicting info on whether "one size" is 2.5 "numbers" up or 5? Guy at the bike shiop I bought the jets from says that going from 117.5 to 120 is just "half" a size up.
I will try the 120's, see what happens and go from there, might take me a couple weeks though haha.
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donimo
Hmm, i went back to 6 discs, it is a bit louder, and it SEEMS to go better, is this just my ears telling my butt it's going faster?
Honda Civic syndrome?
I have never heard a bike that sounds like mine, not that it sounds better than any other bike I have heard, but it's different
I read the manual that came with the can, it says that I should "tune it for stock" and then jet up later. Is it possible to tune my setup for the stock jets until I have time to mess with the carbs?
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Forum LongTimerGSResource Superstar
Past Site Supporter- Oct 2006
- 13968
- London, UK to Redondo Beach, California
Why don't you ignore the top mount completely & get a nice bit of AL or stainless to make a strap to mount it on?
That way you only need to use the mounting bolt & all you'd see from the side is the strap going round the muffler.1980 GS1000G - Sold
1978 GS1000E - Finished!
1980 GS550E - Fixed & given to a friend
1983 GS750ES Special - Sold
2009 KLR 650 - Sold - gone to TX!
1982 GS1100G - Rebuilt and finished. - Sold
2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!
www.parasiticsanalytics.com
TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/
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