Jetting for E-series S-bend
Posted March 26, 2000 - 07:28 AM
So what do I do but buy a White Bros. (used) E-series S-bend. I understand the number of dics effects performance and noise output. How will this effect my current jetting? Larger main jet only or will this muffler affect the whole range of throttle openings. Has anyone run this combo for some baseline settings? Any help on this matter will be greatly appreciated.
2000 Yamaha WR400F
1988 Honda NT650 Hawk
1977 Suzuki RM250B
1974 Honda XR75K1
Posted March 26, 2000 - 07:36 AM
Why did you decide on the 'S' bend verses the megaphone?
My dealer told me the megaphone is the only way to go because it adds much more horsepower. But, I've heard on this forum that the 'S' bend adds more lowend torque and the megaphone more upper revs. And it is CERTAINLY more torque I need here in Colorado, not extra upper end.
Posted March 26, 2000 - 08:44 AM
The other reason was I found it on E-bay at a good price! Can't resist those "bargains".
Posted March 26, 2000 - 01:31 PM
I have a White Brothers E-series muffler that I fitted to my 1999 wr400. It greatly improved the power throughout the whole rev range but yes it is a low end pipe. I am running 5 discs. I have a 172 main jet and a 48 pilot with the fuel screw in at 1 1/2 turns. I also have a WB White Power filter.
As I have an australian bike the power increase in replacing the pipe was massive.
Posted March 26, 2000 - 03:37 PM
I just converted to YZ timing and although power is fun, I don't think I need any more. It would be nice to gain some low end to balance it out some.
Now, you guys need to tell me how loud the 's' bend E-series is compared to the stock pipe with no baffle. I know it's tunable. I'm talking how loud with the disks for max power?
Posted March 26, 2000 - 04:11 PM
Hope this helps.
Posted March 27, 2000 - 01:15 AM
And I have found the same specs as Jason mentioned above work best for me, I also know a lot of guy's who went from 12 discs back to 5 and thought it was a good move, for noise and bottom end.
R o d. H.
400 Thumpers Australia
Posted March 27, 2000 - 02:35 AM
Posted April 08, 2000 - 04:38 PM
Posted April 10, 2000 - 12:43 PM
stock needle #4 clip from top
2.0 turns out on fuel screw
You may also search using Bill in NC or email me at email@example.com and I'll try to help with what I've just learned.
Bill in NC