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Discussion Starter · #1 ·
Just got the dyno results back.
2002 Case bored
s&s 4-5/8 crank welded, balanced
s&s superstock 89cc heads ported
woods tw9bg
solid lifters
super g carb with oversized filter
ported manifold with YOST Performance spacer
FAB28 2-1 exhaust 1-3/4 to 2" primaries with 2-1/4 merge collector and muffler
125hp/147tq
If you look at the chart you can see where the exhaust is choking the motor. Right around 4300 rpm. FAB28 is hooking me up with a 2.5" merge collector and muffler. Should push the hp in the 140-150 range. We are also going to try a Boarzilla exhaust and see how the numbers improve. Should be fun to ride until we upgrade the exhaust. Tons of torque.

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Nice! I'm not familiar with the exhaust you're using now but the D&D Boarzilla made a nice improvement on my 124. It's definitely gonna be a loud pipe with what you got thumping in the motor. I'm happy with the Boarzilla and it gets compliments all the time
 

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Discussion Starter · #9 ·
Nice! I'm not familiar with the exhaust you're using now but the D&D Boarzilla made a nice improvement on my 124. It's definitely gonna be a loud pipe with what you got thumping in the motor. I'm happy with the Boarzilla and it gets compliments all the time
What kind of numbers did you do?
 

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Zilla is a step in the correct direction. 9B is too short IMO for a 124. Practical maximum S&S 640'S 11.5:1. TMan 662-2 ps2 or CR630's will come on earlier over the 640's and have a good seat of the pants (TQ) feel. TMan also has the new 680 PS2's. Similar to the 640's,
 
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