Discussion in 'XJ Technical Chat' started by Xj Bobber, Jul 13, 2015.
Can everyone see the pictures of my bike I put in this thread?
I can see it . . . but if it don't run . . . . . .
See a lot of mods to it, including pods and chopped mufflers. What I have gleaned here is that a stock bike is easier and more predictable to tune/ troubleshoot.
You need mufflers. I don't mean that it woud be nice if you had some, I mean that you NEED them. Power delivery is crappy without.
Buy a new battery & eliminate that from the equation........
Some of you wise xj owners are so patient.
better pic of alternator brushes showing wear limit indicators...........
Although this is a better pic i can see them just fine in the first photo. Nice pics.
Thanks guys. i got the bike without mufflers they dont have to be stock right? Is it all in the length for the back pressure like a car?
Is there a special way that the alternator cover has to come off? i feel like im going to rip some wires when i gently pull on it.
slide the rubber gromet out of the shell where the wires run through it it will give you a little more play
has anyone tested the wiring to the engine stop switch?
sorry for the last up guys missed a couple of pages
Should this be about 12 volts?
Some advice, I have full output voltage above 2,000 rpm's 14.40 volts. At idle it is running on the battery. Starts at 12.6 then slowly drops to 12.30. I tested the stator and they are in spec, .45 ohms give or take 10%. Also tested the rotor and they are in spec, 4.0 ohms give or take 10%. I have 50,000 miles on it and i am pretty sure the brushes have not been changed. Peace of mind i will change the brushes. Have not checked the regulator yet. Brushes or regulator??need changing or both?
from this link
The Ultimate Relay, Switch, Sensor, and Diodes Guide
"For all XJ-series models, the maximum available charging output VOLTAGE should be as follows (all values are approximate):
* approximately 500-2000 rpms: 1.8 volts gradually increasing to 14.2 volts
* 2000+ rpms: 14.2 volts up to about 14.8 volts, with a maximum of 14.8 volts (all models except XJ700-X and XJ750-X)
* 3000+ rpms: 14.2 volts up to about 14.8 volts, with a maximum of 14.8 volts (all XJ700-X and XJ750-X)
If your charging voltages are too low, suspect the alternator brushes first, then perform the alternator stator and rotor checks as described in the Alternator Section.
Note that worn, dirty, or damaged alternator brushes can affect these readings, as can "dirty" copper commutator rings on the rotor face (where the brushes contact the rotor):"
clean rings with a eraser
could be the brushes there is a wear mark on them should be iirc 17mm to 11mm
clean battery terminals and ground connection to frame and motor from battery wire
and any other connectors in the charging system take a good look at the voltage regulator connectors
I read on another yamaha site that if you go stright pipes go short not long
I will look for that site and post it here.
but mufflers are better
yeah, mufflers are better for your bike and for your neighborhood too.