Carb lost ref pic

Bought an extra hitachi carb bank about a year ago
or so and decided it was time... I guess I goofed with
my reference pics. I either didn't save it or something.
None the less, I was hopeful to pick a brain in getting
a handle on what jets for the gas/air mixture,(?), go
where..? I have my manual in another locale and had
a diagram from way back that I had downloaded here
and it's in a gif format and bitmapped real bad.

Sorry for the lowzy cell pics. Can I please ask for some
direction to go back together with these carbs.

Thanks so much for any/all help.

 

Howdy XJ, the arrow in question is where the MAIN jet and emulsion tube live. And FYI, the lower arrow is where the pilot jet goes. Hope this helps you!

 

Heya' Steve..!
Thanks so much podnah! Sure does, Just wondering what the size
would be for each. I should have wrote the info down before I lit
out earlier and didn't... Like a dummy. Large and small jets and I
blew it with no pic. Arrrgh...

Thanks bro, TOP SHELF!!!

 

I'm sorry, my book only covers XJ 650 and 750 from 1980 thru 1984. Keep askin' tho' lots of knowledge here from others.

 

Your Pilot jet is small, a 40 or 41
Your Main Jet is noticably larger, 107 ?? 110 to 126 is the range we use.
The numbers are stamped right where you can see them, with a magnifying glass, it's easy.

 

Thanks Steve, I sure appreciate the help bro.

 

Time..!
What's a goin' on buddy! Yes sir, That's me podnah... The dude with
the magnifyin' glass don't ya' know. Got 'er squared back up late
yesterday afternoon. I'll still have to set the floats and do a bench
sync yet. I am the proud owner of a new motion pro... Finally. Just
doing these on the side at work as I get time. They were rough to
begin with and 'course sitting for a while with PO and now me...
Yikes!
Thanks bro and it's sure good to hear from ya' sir!!!

 

Got this extra carb bank finished up Friday afternoon before I
left work for the day. After looking at my tank and all the muck,
Decided I'd clean it out and pulled the original carb bank off and
went back with a freshly cleaned out tank and this rebuilt carb
bank.

Put the rebuilt carb bank on, Fresh gas and new inline fuel filter
while I was at it... Also had to clean up the petcock due to quite
a bit of build up from last years rebuild. That thing was fresh new
and looked like T-total heck with rust build up..! At any rate, Now
all is fresh/clean/rebuilt and I see right quick... I'm not getting
fuel to the carbs. (bowls are bone dry) Didn't mess with the floats
during rebuild, To me they looked just about right according to the
original carb bank and movement was smooth..? Soooo, I'll pull
the carbs back off and see if I can get 'em squared away. Can I
get any insight as to what is prohibiting fuel to flow to the carbs?
Just out of curiosity, I removed the fuel line at the new fuel filter
and tried to blow in and thru the fuel rail... Nada..? Man, I really
hate to put the old carb bank back on given the looks of the valve
and tank. The only thing I side stepped with the rebuild was to
clean and reuse the small screens on bottom. They looked real
good given their age tho..? I guess I'll get another rebuild kit in
and go ahead and rebuild the original carbs, I dunno...

Appreciate any and all help/insight as always.
Thanks -Mike

 

If you tried to blow air thru the fuel line to the carbs, and got nothing, then you have float valves that are gummed up with what's called "varnish", this is a residue that forms when gasoline is allowed to evaporate inside a carb.

What you can try is this: drain your tank of the gas, refill it with pure carb cleaner, put the petcock on "PRI" and let it set for a good long while, I mean a week or longer. Do this before going thru all the trouble of pulling the carbs.

Of course, if you are in a hurry, pull the carbs, remove the bowls and spray carb cleaner into the float valve directly. WARNING! don't force the floats to move, gently try to move the float after it's been sprayed and let set for a while, about 15 or 20 min. What you have to watch out for is a condition of repeated 'evap' events which can result in quite a thick build up of this varnish. Gumout will dissolve this residue, just give it time to work.

 

Hey Steve..!
What's a goin' on buddy. Well, I had cleaned it all up and
replaced the float valves with the rebuild. I'm just curious
if for some reason, There's not a vacuum or enough of a
vacuum bein' generated..? Fuel rail clean and clear, Shoot...
I dunno for sure. I'll go ahead and pull 'em this evenin'
and see if I can pinpoint somethin'.
Thank ya' sir!

 

Now it sounds like you aren't getting gas thru your petcock, try the PRI position, this bypasses the vacuum operation of of your petcock. That is if your bike still uses that kind of petcock.

 

Yes sir, I did exactly that with the petcock. I remembered reading
a post where setting it to PRI would bypass the vacuum and start
the fuel free flow. I've got fuel out of the tank thru the hose, Then
I made sure I had fuel; Tank>hose>inline. Disconnected before the
inline and tried to blow what fuel was in the inline on through. I get
no flow through the rail feed line though. That was with all four of
the screws out of the bowls..?

Didn't get in 'til late in the evenin' and didn't get a shot at pullin'
the carbs like I had hoped. Maybe something has bridged the line
into the rail, I dunno..? I'll try to get in at a decent hour this evenin'
and see if I can find an obstruction and/or issue, Ya' know. Gotta be
somethin' cooky for sure..? Thanks bro, I sure appreciate all the help
and insight.
Thank ya' sir! 8)

 

No problem, I'm sure you'll sort it all out.

 

Sheez man..! I'm not just real sure what to do at this point.
Pulled the carbs, Made sure the main fuel line going to the
carbs was free and flowing. Pulled the bowls one at a time,
Checked that floats weren't obstructed and fuel would flow
in and thru each float valve. Sooooo, Buttoned it all back up
and before I put the tank back on, Checked to insure fuel
was flowing into the carbs. Good... So let's get this tank back
on and light this thing up. !Nope! I could see right quick that
fuel wasn't filling the inline filter..?

I pulled the line off the inline and fuel flows by way of, ON-
RES and PRI. So, I pull the line after the inline and fuel
flows by way of, ON-RES and PRI..? So okay, I pull the the
inline filter, Put the old inline back on and I get fuel to the
first carb, (lft side), only. Tried starting fluid to see if it would
begin to create the vacuum after it was running. Ran for the
couple seconds off starting fluid and starved out. Checked again
and fuel flows out of the tank>line>filter>first carb and that's
where she stops. Fuel rail has no obstruction whatsoever so
I'm at a loss with this carb bank. I'm gonna have to get the
rebuild kits in and go with the original carb bank..? I am at
a head scratch with a possible vacuum issue or vapor lock
of some sort..? :?

 

Hey-you're probably a much better wrencher than I am, but I just gotta ask here. Is it possible the floats are installed upside down? Cuz I know a dummy (hehe) that did this once. Just tryin to help-good luck.

 

XJ, after initially laughing at WWJ, I reconsidered what he's tryin' to say; that if the floats are put in up-side-down, that they won't open because they can't pivot as they should. Check to see that the floats didn't get installed the wrong way. The flat part goes up. This is just a guess on my part as I don't know if they can be installed the wrong way, I've never done it.

 

Yes sir, We're alright with the floats. Other than the possibility of
'em hanging up somehow or another..? I seriously considered the
thought of putting the original float valves back in... 'Course
that's just me graspin' at straws there. Did go back with the brass
washers vs. the steel that came with the kits. Walked right past
the thing today. Went from an 84 degree Wednesday to a rain/
sleet/hail 33 degree, 40mph wind Thursday..! 8O

I've gone over it in the ol' noggin a few times and the knowing
the petcock was rebuilt just last year and the fact that we've got
fuel flow, I'm uncertain about the fuel flow volume..? I'm more
thinkin' out loud... With the bike on center stand, We're so-so
level. What would allow fuel to only make it to one of four carbs
and the one in this case is the far left. The main fuel line runs
into the fuel rail in the middle. I've checked to make sure there
was a flow into each carb one at a time with and without the float
valves in. Just to see it with my own two eyes, Ya' know... Sooo,
It's got me scratchin' about a vacuum and/or fuel volume thing.
Just don't know what I've got goin' on.

 

You need to check the fuel level with the clear tube method. That will tell you if the floats are correct. There is a very tight window, and if you don't use the clear tube method to set float height, you simple will not get them right...it either flood the carbs, or not allow the needle to let fuel flow.

 

Oh..BTW...you mentioned you already rebuilt the carbs. In the kit did you replace the needles and seat? If so, did you get the needles that are 1mm longer than stock? If so, you will have to reset the floats

 

Hey mook..!
Thanks so much, I didn't realize the needles were longer.
I'll get a shot at pullin' these carbs one day thru the week
and check out the "clear tube method". Righteous bro, I
sure appreciate the insight!!! 8)

Thank ya' sir! -Mike

 

There are different kits. Some of the aftermarket kits have needles that are 1mm longer than stock and must reset floats. The kits I got were oem of the stock length, however, I rechecked the floats with the clear tube method every single time I take the carbs off. I really hate going through all of that work and get them back on the bike to discover that the floats are off.

 

Checked, Reset and checked the float levels this evening at work
by way of "clear tube" method. Got in and dropped the carbs back
on and hooked the lines back up. Noticed again, The clear inline
was not showing fuel. I figure alright, The bowls still have fuel left
in 'em let's see if the thing will fire and begin to draw fuel.

Bike popped right off, Ran until it starved out..? I pulled the fuel
line before the inline and got full fuel flow. Pulled the fuel line after
the inline and got full fuel flow. Double checked again that the line
into the rail is clear of obstruction/kink, etc. Opened the cap thinkin'
it was some kind of vapor lock..? Nupe, No fuel flow to the carbs at
all. :? Ran that initial fuel from float level and starved out.