Throttle body synchronising
Hey: thanks to Bayou Boy for the pictorial and the how to on synching. I read it up, did the mod to extend the test ports, and got the job done.
I bought a twin max electronic synchroniser: I can't remember where I got it online, but you can do a search and find it. This thing really works well. It's electronic, runs on a 9 volt battery, and you simply hook up to the test ports, turn on the power, adjust the sensitivity to max, zero the meter, and then start the bike up, with the sensitivity set down to min. Then increase the sensitivity and check the balance on the meter. I messed around with it for a while, shutting the bike off and readjusting the zero a couple of times to make sure I had it zeroed properly. Thje sensitivity adjustment dampens out the power pulses from the cylinders, but I found the higher the sensitvity, the more accurate you are in balancing the TB's. However with the sensitivity set at about 3/4 the pulses are dampened out enough to read it accurately.
My bike was off just a little, I think about one unit, but all I had to do was barely touch the adjusting screw to bring it back in to line. It would appear to me that the adjustment is so sensitive, I can't imagine how it wouldn't get out of adjustment just by normal riding. I checked the balance all the way up to about 5,000 rpm and it seemed to stay pretty close to zero, just moving one point of a division each way up and down.
I would really recommend the twinmax. You can use it on a four cylinder bike too, you just adjust each cylinder in relation to the master cylinder, which on the SV is #1. On a honda 750 nighthawk it's number 2. I think I paid $69 for it online brand new.
A Kiwi lost in the wilds of America