Well, finally got around to using my new Carbtune Pro to sync the 4 carbs on my ST1100
The carb tune is easy to use, I did find there was small changes from one "rev up" to another. If I balanced all 4 within a segment on the Hg reading of each other, if I then gave the bike a couple of "big" revs, they did not always settle down to the same levels
|||. This was not a huge amount, but I found that I spent about one hour "hunting" my settings between cylinders one to four.
I picked up a small length of Vacuum hose (5/16) from MALZ here in WA (A mistake, as it was about half the price at Supercheap. plus the pack of vacuum "T"'s were cheaper at Supercheap too, but you live and learn), I also picked up a small pack of Vacuum "T's" to join into the vac line to the fuel cut off. I picked up a pair of 4mm ones as suggested at Malz, but found that as soon as the neoprene heats, the 4mm passes some of the vacuum. so swapped them for 5mm pack, The 5mm is s tight fit on the bike vacuum hose (the hose that goes to the fuel cut off), but it does fit, and stays tight even when the bike is up to heat and cooking.
Hardest thing really was finding the adjusting screws at the beggining, and getting the hang of how you balance one pair at a time, them balance the left and right pairs together. Once I got the hang of that, it is very easy to do. The way I was reading it, I thought that you just balance one at a time from the fixed carb (carb 4), maybe if I had re read it a few times, it may have made more sense.
Next time, I know I don't need to take the grey plastic tops of the left and right fairing off, just the left and right fairting inspection lids and the false fuel tank cover.
The other thing I found was that when I tested by bike before adjusting it, the left pair of cylinders were near balanced, the right pair were out from each other by about "2" segments of the HG reading. The real problem was the that right pair compared to the left pair were out by about 5 segments from each other. God only knows how they got that far out from each side. I did think it may have been a problem with that particular adjuster. But it came back in line OK after running through the process.
At least I now know what to do next time. So that is easy as pie.
, and I will not be trying for perfection either, just get them all balanced within + or - 1 segment.
The test drive after setting them, well, my bike appears smoother running, and it purrs on idle now. I did not realise just how much vibration it was giving until it has gone.
The Carbtune was well worth the purchase price, and I love being able to do those things myself too.
Thanks to all for the tips and comments
Mark
