S&S 124" bagger build
Road Master
Joined: Nov 2007
Posts: 774
Likes: 54
From: Brandenburg,Ky
A clutch spring won't cut it and a 124" with no headwork won't come anywhere near 140/140.we do a lot of 124"builds and use BANDIT clutches on most of them,also use 110 (ported) heads on most,they will go 145+ no prob,but if your using oem castings,even with bigger valves you won't come close
Road Captain
Joined: Jan 2009
Posts: 714
Likes: 120
Oh yeah?https://youtu.be/86E9d5PMCxAGarrett
If it’s true that you don’t put a Rocket motor in a school bus, or whatever the quote was, well why not?
Sounds good to me!
BTW, OP, don’t sweat the HP...S&S 124’s for the last 20 years stock have been making 120-130 HP LEGIT, unless you run it on a happy dyno-that’s what they make, plus or minus a few, and repeatable on most any dyno on pump with stock everything).
Last edited by PWMORRIS; Aug 17, 2019 at 08:05 PM.
Thread Starter
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Cruiser
Joined: Sep 2017
Posts: 152
Likes: 20
From: Cody, Wy
Very happy now!
Ok so I finally have the 124" ironed down with a clean DynoJet dynomometer. The engine was running good in the colder weather but when it got warmer the check engine light would come on and the engine would flood and stall out when started. Found fuel in my oil so I quit riding and started making phone calls. Come to find out that the shop had dirty O2 sensors on their dyno causing a false lean reading when tuning. The check engine light came on ever since the engine work was done but it would go off and I could still ride. I've been questioning them about this since day one. They were stumped. When it would stall out I found wet plugs and gas in oil. Took it to another shop who I had many good experiences with. A leaner correct tune completely turned the bike around. No more check engine light, mpg is 43 and the bike PULLS HARD EVERYWHERE! Now I'm afraid I could break a drive belt so I need to ride responsibly. So all in all here's my setup.
S&S 124" Hot Setup kit
Swapped 640 cams for 635 HO ez start cams
HPI 62MM with 6.7 g/s injectors
D&D Boarzilla exhaust
S&S TC3 cam plate and oil pump
Barnett Scorpion clutch with low profile lockup plate and billet basket
Darkhorse machine Timken bearing conversion
127.49 hp @5350 rpm
144.01 tq @3670 rpm
Bozeman, MT elevation 4793 ft.
S&S 124" Hot Setup kit
Swapped 640 cams for 635 HO ez start cams
HPI 62MM with 6.7 g/s injectors
D&D Boarzilla exhaust
S&S TC3 cam plate and oil pump
Barnett Scorpion clutch with low profile lockup plate and billet basket
Darkhorse machine Timken bearing conversion
127.49 hp @5350 rpm
144.01 tq @3670 rpm
Bozeman, MT elevation 4793 ft.
Last edited by Blackstreak; Aug 20, 2019 at 01:21 AM.
Thread Starter
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Cruiser
Joined: Sep 2017
Posts: 152
Likes: 20
From: Cody, Wy
Just FYI
PWMORRIS I cannot see your replies because you are on my ignore list. You have been on my ignore list for quite a while. I do not care to read your insults. I posted what I posted because I found it difficult to get any information on how the 635 ho cams performed in a S&S 124 engine. Now I can offer my setup so anyone considering these cams can see the characteristics of these cams in conjunction with my other parts. I totally love this setup! Cheers!
Last edited by Blackstreak; Aug 20, 2019 at 01:23 AM.
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
120R heads will work very well.with any heads the compression can be set pretty much anywhere you want with either pistons/milling for higher compression or machining the chamber/dished pistons for lower compression.my personal 124" in a 2002 RG is 10.0-1 with .570 cams (110 head castings)
Tourer
Joined: May 2017
Posts: 289
Likes: 13
From: Buell Town
120R heads will work very well.with any heads the compression can be set pretty much anywhere you want with either pistons/milling for higher compression or machining the chamber/dished pistons for lower compression.my personal 124" in a 2002 RG is 10.0-1 with .570 cams (110 head castings)
Last edited by 838; Aug 25, 2019 at 10:20 AM.
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
We were looking at something exactly like this for my dads 14 street glide. S&S crank -10cc pistons and heads are at 92cc. Depending on head gasket used bike would be between 10.15 and 10.35 static. I was researching using the S&S 570 and theres not a lot of 124 builds (at least online) with that combo. How do you like it? Are there better choices at this compression range?
their OK,but really wish I would have got a bit more aggresive
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Tourer
Joined: May 2017
Posts: 289
Likes: 13
From: Buell Town
Ok good to know. Were looking to keep this one at or around that 40* intake close and under .600. Heads are S&S that have been touched up by Ward??? Its a late winter project but running the .570 in a 124 perked my interest for his goal of a cross country thumper!