Ok, here are a few symptoms that you will find when you are due for a throttle body synch.
1) - Increased vibration at all rpm. It is hard to pick up at idle, you'll certainly notice it at the smooth spot (DL1000) between 4 - 5.5k rpm. At 4.5k the 1000 should be damn near smooth as glass with no vibration at all from the engine, if you feel any it's time. It will also feel very rough on acceleration, to me it sort of sounds like a growling dog. The engine gets a kind of GRRRR sound and feel to it. I know this is quite subjective but that's what comes to my mind. Also a day long trip will start causing numbness in the hands by rides end. 90 degree twins are balanced, when out of tune they induce vibration.
2) - Backfiring through the boots. I've never had to resort to installing a Power Commander or doing the Yosh thing since I don't keep the revs low (ask Heavy and V-Tom...WooHoo). I rarely get a backfire through the boots around 3.5k rpm now but when the throttle bodies go out of sync it is much more common. If you know what I'm describing you know the sound, if you haven't heard it it sounds like a BBQ that has had a bit too much propane before hitting the igniter. This only happens at the lean spot, usually putt-putting along and much more prevalent when going uphill or when the bike is laden with luggage and female ballast.
3) - Idle decrease. The idle will decrease over time as the throttle bodies go farther out of sync. Some dummies (yours truly) compensated by turning the idle up a tad. Do that a few times and see what happens when you do a TBS. Your bike will idle fine when cold then will not drop below 2500 rpm when hot. What you have done by doing the TBS is brought the bike back in tune and the idle speed drops, but since you have turned it up you are way too high and the bike now sticks in high idle.
'07 KLX250S - Road
'00 CBR600F4 - Track
"The World is a book, and those who do not travel read only a page" - St. Augustine
Last edited by The Shepherd; 10-19-2007 at 08:05 PM.