1982 xj650 Cranks but wont start 2 days after buying.

I saw what you did there.

 

Did you report it?

 

Okay, I did some more testing today.
Bike starts amazingly cold. I have the oil at the correct level.

When I hit the front breaks hard, the oil light does not flash and it does not die suddenly, it dies quick but it feels like coming to a stop without pulling in the clutch.
Once it dies, the only way to get the bike started is to repeatedly pump the choke open and closed while cranking. just keeping it set at half or no choke won't work.

The bike dies when ran on PRI, ON, or RES.

I will try to remove the vac line from the petcock to intake manifold and plug it up how it was when I got it, and see if it still happens.

Also, when revving the bike up in neutral, the engine sputters like a misfire at 7k for a little, then continues on to 8.5k where it kinda tops out. Increasing choke slightly makes this worse.


I guess I need to figure out if this is ignition or carburators. probably both.

 

did you use vacuum line or just any tubing?
is it 4 mm ?
have you running synced the carbs yet?
do youu have the proper wet setting on fuel bowl levels?

 

I used a vaccum line and it's 4mm it seemed to fit nice and snug.

I don't know what you mean proper wet setting on the bowl levels. Idk how to check that. Sorry

 

you can check it before changing it
Setting the fuel levels

 

So I need to remove and split the carbs to do this?? I'll have to learn more before I attempt this. I'll do some reading. Thanks

 

no you can leave them on the bike. put it on center stand and shim up front tire to level carbs front to back.
you can check levelness of bike with tube you use for checking carbs. place tube at front of carb and rear of carb check for same height of fuel level then do #1 carb to #4 carb to check for level left and right . shim centerstand if needed.
then check each carb for fuel level.

 

Okay cool. Ill try and do this as soon as I can,.

I removed the vac line and plugged up the port and ran the bike on PRI. It still does it. I can have it in neutral, push it to 5mph and hit the front brake and it dies.

When it dies, it will start if i have no choke, hold the throttle wide open and crank it. that means its being flooded right?? so your hypothesis is probably correct. i'll check the levels.


To be honest I don't have any experience working on carburetors. I don't know if i'll be able to fix them. I wish I got a single cylinder so I could just slap a new carb on there.

What are my possibilities? Could I just buy 4 150cc carburetors and put them on? Link the throttle and choke together, and make some sort of a fuel rail to have 4 lines going to each carb.
Or I could use tilitson TCT carbs. its a mechanical fuel injection carb (used on 212cc gocarts) so I can adjust the mixture on the carb (like an adjustable jet). I don't care if I loose performance I just want to be able to ride this bike I baught.. I got ripped off hard..

 

what do you have the idle set at? should be 1050rpm

 

Here is a convo with prev owner. I'll try and figure it out. thanks for help.

 

I have it set at 1500 just cause I'm too scared of it dying on me. Should I lower it and try again?

 

Fwiw, I keep my rpms just a little north of the 1050 mark. I don't like the idle that low. Personal preference.

 

Would having it set at 1500 contribute to this happening

 

do you apply the rear brake when this happens or just the front brake.

just thinking along the lines of what shifts around on a hard front brake situation.

make sure your battery terminals are properly tightened and battery secure.
is the fuse box original? your seat could be pushing down on fuse box causing power lose to fuses (Main and Ignition).. we had a member with that issue. when he sat on seat bike would die.

 

Ive tried it with both rear brake and only front brake. seems to make no difference

It could be the battery, I'll tighten it up and try it tomorrow (too cold at night here in indiana)
Let me take a picture of the fusebox and upload it. its a real mess.

What's weird is it seems to FLOOD it out, seeing as I need to crank at WOT to get it to barely start. the previous owner said this never happened....

 

Okay, I checked the battery its pretty secure and terminals are on there tight.


I just tested this, bike on centerstand in neutral ideling. with the seat off and not sitting on it, if I push the front bars down far enough it will die. If I push it moderately hard the rpms will go down but once its upright its back to normal. Keep in mind im not pushing the forks down ALOT but a decent amount.

I should try to elevate the rear wheel more and see if it will even start at a similar angle.

Here is a pic of the fusebox

I think its fuel related as it doesn't die right away and its hard to start if It dies from the front forks compressing.

Also i noticed its leaking oil kinda bad from the valve cover. Is this a sign of anything bad or just a bad gasket?

I will do the bowl level check and look into that damn oil leak. My oil level went down a bit.....

 

Well I can pretty well bet it's NOT the fuses

 

The fuel levels in the float bowls are low. You won't have to break the rack apart to remedy that, but the carbs will have to come off the bike to adjust the floats.

 

you have 2 fuses at 20 amps 1 at 15 amps and 1 at 10 amps.
you should have 1 at 20 amps and 3 at 10 amps.

i would look at the fuel levels.
if bowls over fill when you brake hard excess fuel will flow out the main jet an the needle and possibly out the overflow ports in the rear of the carb throats . could be why it acts flooded out,

 

Ahh, I see. I'll try to check the levels tomorrow. Thanks for the help.

 

Okay, I know I can check the fuel levels with the carbs on the bike but I accidentally pulled the main fuel line off. I can't for the life of me find where it hooks up on the bike. Can I hook it up without taking the carbs off? l guess I need to remove the airbox.


I used a camera to look where it used to go but I dont see any ports.

 

Between carb 1 and 2, just above the body-to-bowl line