Originally Posted by mneblett
If you have an older LT, this will NOT solve the >86F, low rpm stumble.
As I understand it, this is a device which alters the O2 sensor signal sent to the Moronic computer, effectively "tricking" the Moronic into making the mixture more rich. Possibly useful on the pre-'04 single-plug R11xx bikes, but a waste of $$ on an LT.
The hot day stumble is due to a quirk in the firmware of the Moronic. The earlier bikes were provided with firmware which (to the rider, unexpectedly) retards the ignition timing several degrees when the ambient temperature is over 86F, the rpms are low, and there's a lod on the engine -- the idea being that in these conditions, with really crappy fuel, the retarding reduces the chance for pinging. The problem of course, is that retarding timing reduces power output, so the rider gets surprised when the bike does not produce the expected amount of power for a given twist of the wrist. The boosterplug device does nothing for this.
BTW, there is a fix for the hot load issue -- a search on "hesitiation" and "retard" should return a number of threads on this.
I realize this is somewhat old thread, but I have a 2007 LT that has pretty bad hesitation when starting out on a hot day. My understanding is that the 07 model year no longer has the brown wire to cut. Also, my problem seemed to get a lot worse when I could no longer buy anything but E10 fuel. My understanding is that the BoosterPlug does not trick the oxygen sensor, but rather tricks the airbox temperature sensor into thinking the temp is 20 degrees colder than it actually is effectively increasing the mixture richness by about 6%. I suspect this may help a lot with hesitation induced by E10 at the warmer temps (I notice it mostly above 80 degrees or so, but sometimes even at cooler temps).
This device does not affect the engine timing directly, but from what I have read the retarding of the ignition timing only occurs at higher temps so by making the bike think it is running in cooler temps, this should effectively forestall the algorithm that retards the timing.
So, has anyone tried this on an LT, particularly a later model like my 2007? Also, the BoosterPlug web site suggests that this can be installed on an LT with only removal of the left fairing panel. However, in perusing my Clymer manual suggests much more effort than that including removal of much the tupperware, the seat bridge and partial removal of the fuel tank (slide it back some). Has anyone done this installation who can confirm how big a job it was?