I finished the install of the cruise control, but it didn't work. In diagnostic mode, it showed that all the signals were working. So I returned the unit and got a replacement yesterday. I was relieved to find that it worked. If I had it to do over again, I might use the Audiovox CCS 100. It's half the price and works well. The rostra unit is not compatible with the VSS signal, and you can' use the tach to control your speed. I had a magnet kit from a old Audiovox unit that I used instead of the VSS signal. I placed 7 magnets around the rim of the rotor to generate seven pulses per revolution.
The unit works excellently at highway speeds. It instantly engages with no hesitation and keeps the speed steady. I can engage it as low as 25 miles per hour, but at that speed, it's constantly making corrections so the bike speeds up then slows down. At 35 up a gradual incline it works quite well. On the level there's a little problem with it speeding up and slowing down. If it's downhill, forget it. This unit has a lot of dip switch adjustments, but I haven't tried to adjust those to see how it works. I'm very pleased with the results, but it was a tough installation and the fact that I had to use a magnet kit was a bit of a disappointment to me. The unit is larger than I expected, and it barely fits under the left fairing beside the gas tank. On the other hand, I love having cruise control and it works excellently at the speeds needed most, 45 mph and up. Neil
Too bad that unit is such a PITA. The Audiovox CCS 100 is so easy, one wire to the coil and works flawlessly...
As for the low speed/high rpm snatch, I had this issue too, make sure the pull cable has near zero slack, it makes a huge difference. I can cruise at 30 MPH with no snatch at all, very smooth. Also, check your dip switches, not sure about your unit, but I found for the Audiovox the recommendations on the internet are for 4 cylinder engines and I found for our twin we needed slightly different settings I forget my settings off hand, but I am pretty sure I set it to medium sensitivity and for 2000 PPM as I was having snachiness at high RPM/low speeds and it would struggling to stay engaged below 40 MPH.
On the level it should work prefect, in fact, even going up most hills mine will hold speed with no problem. I think you need to check your slack and your dip switches. Did you use a vac canister, and if so, did you tap both TB vac ports? On port will not supply enough vacuum. Also interesting that you put it under the front fairing, mine fit really nice under the seat where the tool kit goes and you can run the cable/wires along the stock wiring harness route.