Fuel lines xj750j

touch a quarter or a screwdriver across the two big bolts on the solenoid, make sure it's in neutral

 

Nothing...spark..but no starter turn over....mmmmm turnover....

 

something is wrong with the starter or the one wire that goes to it. you've bypassed everything and told the starter to spin, it didn't.

 

refer to your service manual......for what wire goes where......

 

Just ordered a starter.40.00. Makes sense. Wire checked ok. Even removed the starter and tried it..

 

Manual??

 

It might just be the starter brushes need to be replaced and the carbon dust blown out.
Check for voltage at the starter when you press the starter button. if voltage is present then pull the starter to inspect it and/or bench test it (a used starter will need to have this done as well. They are over 30 years old and starters do require servicing).
Get thee a service manual. they are invaluable.

 

Jeff

A tutorial on breaking down that starter


http://xjbikes.com/forums/index.php?threads/replacing-your-starter-motor-brushes-w-pics.45727/

 

With the starter in hand, how should the end gear turn? This one sticks, difficult to turn. Once I get new rebuilt one ill crack this one and do the rebuild on it. No need for a gaping hole in the crankcase.

 

it will be very stiff, your turning planetary gears with big reduction. clip your battery charger - to the frame of it and hold it tight then touch the + to the bolt

 

i agree...test the starter while off the bike.......bump it to see if it turns ....your starter may be good for all you know....

 

In handy PDF format:

Starter brush replacement

Also did some magic with the pictures. <doge> Much arrows. Such color. Wow. </doge>

 

Pulitzer Prize material, really.

 

Ok. New starter they said it was rebuilt 2 yrs ago...threw it in. Same thing no turn over. Ok. Found an unhooked ground on left side of bike. Hooked up no turn over.
Question 1. With key off. Should I have voltage across the solinoid? Turn key on...no voltage across solinoid.
#2. What voltage should be at the starter when start button is pushed?....I have 6. Battery at 12 with charger on it.
#3. Where does starter get power from. Key on, hit start, it closes solinoid, power from battery goes to starter....right

 

New starter has smooth bearing feel to it, not like crunchy one I took out.
Now I also tested it off the bike...it spins but nothing torque out of your hand type of spin.

 

1) no, correct
2)is the starter connected to the wire? no) same as battery..........yes) at least about 10v
3)right but a solenoid can click but not make a good connection internally
"torque out of your hand type of spin" you used a battery charger, didn't you. try it with a good battery

 

Starter question.
Ohm measurements I have:
0 from solinoid to starter post.
0 from starter post to every spot on starter housing...even starter gear. Good correct? Complete circuit to ground with mounting bolts. What am I missing here? New solinoid installed. Start button cleaned. Maybe something as simple as battery. Batt. Reading is 11.75 with key on, 12off, push start button drops to 8-10???

 

this don't sound right, your measuring from the bolt/terminal thru the brushes thru the coils of the starter back out the other brush to ground/housing, should be something there.
but if it spins it must be there, we'll call that operator error or trial by fire .
your battery is on the edge, can you jump it with a car battery? unhook the - terminal of the bike battery, leave it off. jumper + to the bike battery +. jumper- to the bike frame somewhere to get a good connection. hookup in this order, bike +, car +, car -, bike frame -

 

ITS ALIVE!! MAUH HA HA HA

 

ITS ALIVE!! MAUH HA HA HA

 

ITS ALIVE!! MAUH HA HA HA

 

Ok..I realize I may be resurrecting an old thread. But here we do. I have a 82 XJ650 and am putting on a new tank. I obviously know there is a fuel and vacuum line. My question is what happens if I do not install the vacuum line? My tank came with a new petcock and obviously the old one will not fit the new tank. Am I screwed? Do I have to weld in the old petcock to the new tank?

I am hoping the vacuum is only used is the prime position or something to aid in starting

 

Vacuum is used only in the NOT prime positions.
The vacuum line (small one) pulls the diaphragm back to allow rule to flow in both the RUN and the RES (reserve) positions. When the engine stops, the vacuum stops, and the spring closes the diaphragm. The PRI (prime) position is a free-flowing setting to allow you to refill the bowls when you accidentally run out of gas.

Dave

 

Dave Raco,

Is your new petcock on your new tank just a simple off/on ? If so, no need for vacuum line, but you will have to block off the vacuum intake port on the rubber intake manifold that the original vscuum line went to with a rubber cap.