Staintune

[SportsterDoc]

PowerDubs has all good comments/advice in his post 51.
Without changing cams, the CB, out of the crate, is very close to as good as it gets.

I have modified intake and exhaust on most of my 17 bikes. The Triumph and Sportsters benefited the most. The dealer loaded an Arrow tune (no charge) into the Triumph, even though it had a factory exhaust (later opened up) to reduce any chances of lean operation (2012 Bonneville).

BTW, the Bonneville benefited greatly from snorkle removal, but little from drilling out exhaust.

For the CB:
1. ECM: Best running bike I have owned**, operated cold, operated hot or restart after a brief cooling down. I would be hesitant to change anything. I have never exceeded 8,000 RPMs (reached only occasionally and very briefly) and zero desire to push red-line above the stock 8,500. Seldom exceed 6,000. The speed limiter may be an irritation from a matter of freedom, but I really have no need to exceed 110 MPH, anyway...and it does reach 110 very quickly and with little effort. The CB will reach 110 MPH about the same as my 2002 H-D 1200 Sport (dual plug heads, W grind cams, stage 1 intake and exhaust mods), with over 70 HP @ 5,700 RPM/79 ft lbs torque at 4,000 RPM (stock), only much smoother. It was capable of over 120, but only once did I take to 110.

2. Intake: I sliced off the top of the intake tube, directly over the air filter. I like the sound (sounds like an unfiltered 4 barrel), but notice little if any improvement in performance. Maybe slight improvement at altitude (I go to 8,500 feet frequently). The air filter can been seen, with only removing the side cover.

3. Exhaust: I drilled three 1/2" holes in the area under the conical cover, around the circumference of the exhaust pipe, to bypass normally muffled flow. I liked it for the sound accelerating and decelerating, but did not like the sound at idle. I then drilled and tapped to install flat plate covers over those holes (now hiden by conical cover). I could detect no improvement in performance. I would change the exhaust only if a different sound were desired.

Bottom line, I am extremely pleased with a virtually stock CB1100. On remote desert highways, it goes from 70 to 90 very quickly to pass, usually in 6th gear.

Stock performance:
86 HP @ 7500 RPM
65.6 ft lbs @ 5700 RPM
0-30 1.2 seconds
0-60 3.3 seconds
0-90 6.8 seconds
0-100 8.6 seconds
1/4 mile 12.11 seconds @ 109.25

** Comparing my EFI bikes:
2012 Triumph Bonneville was excellent, after Arrow tune, but I did not first ride it stock to compare.
2018 Yamaha XT250 EFI was flawless.
2016 Moto Guzzi V7II was terrible. It needed at least a minute warm up from cold to even operate it slow. It would balk, upon the mildest attempt to accelerate upon restart, after a few minute shutdown, despite a several mile ride, unless I allowed it 1/2 minute to re-warm. It was traded after 7,000 miles/7 months operation.

Excellent comments from Roper in post 53.

Side note for those on this forum who may consider all Harley's slow:

http://www.nightrider.com/biketech/lsr_gallery.htm