I’m in the process now of building a 131” for myself. I plan on using the same FM xxx head pipe with the FM Street Outlaw mufflers. It worked well in my 124”
Sound like a good combo. You should give FM a call and get their opinion on the Street Outlaws with the XXX. They were very helpful when I discussed my plans with them. Good luck with your build.
Question for you all. My current set up of:
128 S&S build
Fueling 521 Cam
Fueling Race lifters
Fueling springs
SE 64mm TB
64mm CNC'd intake
Fuel Moto Jackpot 2/1/2 with outlaw mufflers
Arlen Ness Velocity 65 intake
Thundermax
Produced this dyno/chart. I have on order a full length SPB FAB 2/1 and a Feuling BA air cleaner. What kind of changes should I expect with this set up over my original set up? Thanks!
I can see why you're getting such good gas mileage. It's a pretty weak tune for a 114 with a cam and Power Vision tune -- not even 1hp/cu. Lots of unrealized potential there. If you intended to tune for fuel economy then so be it.
hdrider1, It is a canned map and I like it. As for unrealized potential, it gets me anywhere I need to go and quickly when needed. I have 20K plus miles on this "build" and NO issues.... You do you, I'll do me. regards, CSM-H
The head are the SE CNC Extreme heads with just a spring change. Compression is 11.3:1. Cranking compression is 235, same as a bone stock 114”.
Just saw a FB post where a shop compared three cams on a 131” build. TTS 250, Maxcell 833, and CR 512. They were all around 140hp.
I have been thinking of trying a new cam that shifts power a little to the right for some more hp, but dyno charts I see are all over the place and don’t give me a good feel for what I could expect with my bike. If I got results like the FB post, it is not worth swapping out cam and valve springs. I realize all dyno’s are different, but 20 hp difference is pretty significant. You think the hp difference is due to the extra compression? What is compression on stock 131” kit? I have a 11:1 S&S 128.
Just saw a FB post where a shop compared three cams on a 131” build. TTS 250, Maxcell 833, and CR 512. They were all around 140hp.
I have been thinking of trying a new cam that shifts power a little to the right for some more hp, but dyno charts I see are all over the place and don’t give me a good feel for what I could expect with my bike. If I got results like the FB post, it is not worth swapping out cam and valve springs. I realize all dyno’s are different, but 20 hp difference is pretty significant. You think the hp difference is due to the extra compression? What is compression on stock 131” kit? I have a 11:1 S&S 128.
The listed compression for a stock 131” is 10.7:1 but from what I read it is slightly less when tested. There is a UTube video on a 131 that JD Cycle Works did without changing compression and made 160 tq and 150+hp with the TTS 250 cam. My run was in 5th gear and would have shown higher numbers in 6th.
11-05-2022, 10:58 AM
