Well after 4 months of procrastinating on this projects (work got in the way) we managed to get it all in
.
A big thank you to Reg_Siemens for your information as well as digging out all the photos that had gone missing.
We used a combinations of Reg's install and drseth's found at
https://www.st-owners.com/forums/showthread.php?125590-Rostra-Cruise-Control-for-ST1100/page3 .
I would also thank Yorkie from the OzSTOC.com forum for his help as we actually did the work at his place
The circumference of the rear tyre is 2m which means with 6 magnets (1 in each disc bolt head) we would end up with 3000 pulses per km. Without buying a signal multiplier, there was no dip switch setting for this (the closest being 2500 ppk). So I ended up using 4 magnets instead inside the heads of disc bolts - more on this later.
The main unit we mounted in the duck tail with cruise cable running down left side of bike and wiring harness down right side.
The hardest part by far was the installation of the cable to the throttle. That and working out the wiring. As Yorkie said - the main problem is instead of buying 1 unit, we are buying 3 parts to make 1 unit (the universal cruise control, the pickup / signal generator, and the controller). After a fair bit of head scratching and shortening, we got the cabling sorted out.
We followed drseth's install for the cable but used a longer piece of metal from the bolt securing the throttle cables. I am not sure if drseth wound the loop cable around the spring or just attached straight onto the stop like we did.
Yorkie put a notch in the idle stop on the throttle assembly to hold the cable in and routed cruise cable behind throttle cables.
Next time I have cover off i will add a photo or will add once Yorkie sends me his pics.
On the ride back from York, i tried the unit at 100kph. The bike surged up to about 105 and then dropped back to around 80 .. then back up to 100 and back down and so on and so forth. Needless to say the rest of the trip was done with just normal throttle handling.
I spent a few hours yesterday (and around 100km on a 4km circuit) setting dip switches to all sorts of things, removing magnets, playing with cable slack (over and over again). What was happening was that when i would engage the CC at say 80 kph, the bike would surge forward to about 84, then drop to 70 then back up to 80 and straight back down to around 65, back to 80 then down to 60 ...... very jerky ... Wombat suggested it sounded like a pickup / sensor problem and i should either move sensor closer or further away. It was around 10mm away at this time so i moved it closer. Surging didn't change noticeably so I moved it away to around 13mm (1/2") ....
It Worked !!!!!!!!
Set at 80 kph, holds at 80 kph (around 50 mph) ... maybe a little rough when it needs to adjust but have not tried any real hills etc. I found the higher the speed, the better it performs (rock solid at 100 kph on flat-ish road).
Thoughts so far ...... An interesting project ... once sorted it seems to perform OK.
Bear in mind this was 1/3 the price of the MCCruise. Yorkie has the MC Cruise and said that it was made for the bike in that all terminations were there to add to existing ST1100 harness so no need to strip wires etc, and being 1 kit, all works happily together - no guessing of wires. I bought the controller with the engaged light and still cannot get that to work.
Thanks again to all involved and for the advice from this forum.
Pezzz