Boost sensor?

Hi anyone know what this is? Its a box under the seat, all the wires to it are broke off, also a wire that goes to the top of the nattery whats that for? Thanks

 

I'm guessing that the people on this board that know anything will ask to see the picture (I think you need more posts before you can post a picture.)

they'll also want to know what bike you have

 

Its on a 1982 xj1100 maxim

 

Hi I was working on my "new" ride and noticed my boost sensor wires are broke off I also noticed my plugs were mostly black too rich, whats the idea behind the boost sensor, also what do u guys run for plugs? Thanks!

 

The boost sensor sends a signal to the TCI and changes the ignition advance based on vacuum from the carb port. Go ahead and fix the wire connections, it will run without it but rubs better when it it.
I run NGK plugs , they are easy for me to get at the parts store.

 

boost sensor is under the tank mounted to the left of the voltage regulator. The box under the seat is the TCI ignition. The wire near the battery if it is white with a red stripe it the battery level sensor. Most bypass it so the alarm wont bother you.
A few pics of what you are seeing would be nice.

 

Is there supposed to be a ground wire attached to the top of this sensor, also my cluster is intermittently working, connections? Theres miles of wiring on this thing!

 

The three pin plug has the ground wire which then goes into the loom which then links up with the igniter unit and the spigot connects via a rubber hose to the corresponding number two carb spigot.

 

Thanks "einstein"

 

WTF! E=MC²

 

Im just going to buy a boost sensor, also I got a line going to the "octopus" thats pinched off, what type fuel line is recommended and routing for lines, I believe mine are too long.

 

Some boost sensors can get broken and there is a test procedure to check if it's working. I can't remember now, but it's in the service manual for the XJ1100, probably the 650 Turbo too.
As someone pointed out in one of the previous posts, one of the Jetmech or Jetfixer I think, the bike will run the same with or without the boost sensor, so I wouldn't worry too much, unless you've simply got to have it.

 

Lol! Took the words outa my yapper lol

 

is the boost sensor also called pressure sensor?
test is on page 6-18 of the xj1100 fsm

 

FSM calls it pressure sensor, wiring diagram calls it a boost sensor



XJ1100 models:

Flasher: on a tab bracket welded behind the right side frame cover, near the fusebox.
Flasher canceller: on a "skinny" tab bracket welded in-between the upper frame rails, to the rear of the ignition coils.
Starter motor solenoid/relay: behind the right side frame cover, to the rear of the fusebox, housed within a round rubber grommet with a thick, rectangular rubber "foot", the foot being attached to plastic pegs.
Starter/Ignition cut-off relay (no color): under the fuel tank, behind the right side ignition coil.
Sidestand (kickstand) relay (blue): under the fuel tank, behind the left side ignition coil.
Headlight relay (yellow): not used
Hazard flasher relay (metal "can"): behind the battery, on the left side of bike.
Safety relay diode: outside the main wiring harness bundle, in the area just behind the fuel tank.
Neutral switch: in a hole in the bottom of the crankcase, just "outside" of the oil pan, on the bottom of the engine, up inside a recessed "well".
Emergency stop switch: under the fuel tank, behind the ignition coils.
Manifold pressure sensor: under gas tank, behind left side ignition coil, in front of reg/rectifier
Reserve lighting unit: under the seat.
your other thread
Boost sensor

 

Merged.