TPS
Throttle Position Sensor
The TPS reads the position of the throttle, and causes changes in timing.
Some info is available in the Yamaha Shop Manual, but is sketchy and falls short of the excellent info available via the Clymer's manual - which is a good investment if you plan on working on your own bike.
How To Test & Adjust The TPS - Thanks to Poppa aka Miro Spacek
Note: The connector to the igniter box is different on the 07 bikes. that's why it doesn't look like the picture.
Take another 5 minutes, pull the tank and use the connector up by the front cylinder.
(Thanks, Dro for this info/advice)
Set Idle to 1000- That's to be sure the TPS - throttle alignment is in a known spot when you do the test.
Idle screw adjusts the throttle position. Then turn the bike off to do the testing / adjustment
Should be obvious, but apparently some folks like to work on their carbs with the bike running.
Added comments:
If you have a ohm meter you can do it yourself, not hard at all or have a friend help...I removed the torx screws with vice grips and replaced them with metric screws, that way didn't have to buy the torx tool.
Get the manual, read up on the TPS settings and make the adjustments. I had to REMOVE the small round metal washers off the TPS to get the TPS to move a little more for the correct adjustment, follow me on this? I am calling them washers, but there about 1/8" thick and they fit under the screws on the TPS. If you remove them then the TPS will rotate a little more for better ohm setting.
Ok, remove the tank and find the 3 wire plug, with blue, black and yellow wires, should be up near the front center of frame. There are two readings you are looking for, a high and low ohm setting. The high setting should be 4 to 6k on the blue and black wires. On the yellow black wires the ohm setting should be 560 to 840 with closed throttle and 3000 to 4500 with wide open throttle.
Where guys are having hard starting problems is that the TPS is set with too high ohm readings and its advancing the ignition too far causing the kickback on start-up. Simply measure the ohms and adjust the TPS one way or another, mine are set at 650 ohm for blue-black and 4200 ohms for the yellow-black wires. You check systems-electrical-other #8 then #10 for TPS settings, its on the left side of kb site.
Warning: Do not remove or unhook the TPS unless you have a Dyna 3000 ignition unit and have higher performance cams installed along with the other mods required to run them and have instructions to do so.