82 xj 750 starter jets plugged do i need new bowls?

Let me know if i can fix these or if anybody has any good bowls i can buy.
they are the hitachi carbs.
thanks.

 

Just soak them with carb cleaner and keep working them with compressed air. You can get a drill bit from chacal to clean the jets if they are really stuck.

MN

 

looks like someone beat me to it. this thing would not idle and it was missing some jets and it looks like the completely drilled out the starter jets. they are about 1/8 inch around. looks like i need new bowls. dangit!

 

I had a set like that. Boy would it blow black smoke when you would use the choke.

I had to pick up another set of carbs to get more float bowls.

MN

 

Ehh...

You want bowls?



I got one or two...

EDIT: I should mention that only 8 of those are Hitachi....

 

i wouldn't worry so much about the bowls as i would the jets. the bowls just hold fuel and have aboslutely no effect on performance. if they're dirty and caked. just clean em up as best as possible.

it's the jets and all the passages you want spotless. those are what make the bike run. the bowl is just a container to hold the gas in.

 

I'm confused. The title says "starter jets plugged", but in a later post you say they appear to be drilled to 1/8".

The passage the pick up tube dips into is about 1/8". The opening to the bowl is almost as large. There is an orifice at the very bottom that is much smaller. Until they're cleaned and you shine a light in there you'll have no way of knowing if the orifice is intact or not.

 

Hmm wouldn't the enrichment tube be considered the starter jet?

 

Not so. The enrichment circuit passages are in the float bowls, situated as Carl outlined, and if plugged will prevent proper fuel feed when using the enrichment circuit ("choke.") The passages (and their tiny orifices) need to be clean.

 

to answer the plugged question. if you continue to read the post you quote you will see he suggested soaking and air. so i did. only took a few minutes to clean out. obviously drilled.

the next question about the enrichment tube. if you look at the breakdown in the haynes manual and see number 36, this is what is drilled out. apparently you cannot replace it.

although i suppose i could plug it back up with jb weld and drill it out to #40....... but i think i will replace them.

 

That diagram is kinda hard to read... 8O
Where's #36?

 

Its the little jet going into the float bowl.
(sorry the size is limited by the board, not me)

 

use photobucket (or similar) and paste the

 

Personally, I answered at work and my manual's in my shop.

I don't know how you'd get those things out even if you could get new ones.

 

Got a Yamaha factory service manual along with an electronic version of the Clymer... And this site. A Haynes at this point is kinda redundant :mrgreen:

 

If the Fuel Bowl Jets are clogged beyond all attempts to unclog them with conventional cleaning methods, ... you can use a Drill Bit to clear the paths.

You can acquire the correct Drill Bit and Tape the Shank to let you get a good grip on it and use it as an AUGER to eat through varnish buildup and grime.

You can chuck it into your Drill and make quick work of it, too.
Tape the Bit or Chuck the Bit so that it will NOT go beyond where the junction is located. DON'T accidentally drill through the other end.

 

Your Haynes manual has an error. There is no part #36 on these carburetors. The orifice is bored directly into the bowl.

You have the well that is about 1/8" in diameter that the brass pick up tube sticks down into. At the bottom of the well there is a small hole bored to the inlet passage that opens to the bottom of the float bowl.

Attached is a section view of the bowl I shamelessly stole when someone else made it. The orifice is circled in red.

If you shine a light into the inlet passage and look down the well you should see just a small pinpoint of light at the bottom. If it's the diameter of the well then someone probably has drilled it out. If you don't see the light it needs to be cleaned.

 

just an fyi for those of you who dont live in the desert southwest like i do. imagine getting years worth of crud in your carburetors. then imagine putting them in your oven for 2 years on low heat. that is the kind of baked in crud you get in carbs here. the new formulas for gas are crap in the desert as well. they evaporate terribly. up to 10% a month!
that is probably why they are drilled out. gunk turns to stone here.
dont even get me started on trying to drill a hole in the ground here. it is just like cement. the post hole drill just starts smoking past a foot.
different world here in the desert.
thanks for the info. i may just try them with the holes i have. worst that can happen is i cant use my choke. but most of the time i dont need it cause it is so warm.

 

Nice Pic MiCarl!
narftroz, if you have access to a machine shop, get those well bores cleaned out by a mill. Send them here if you have to, I got connections.

 

I disagree, the bottom of the bore is brass, so there is something in there just like the breakdown shows. Chacal also mentions it ...
"Starter FUEL Jet Size: #40 (non-replaceable, in float bowl)"

but thanks for the input, and the cool drawing.

 

The Fuel Bowl's Bottom Orifice which connects to the small Siphon Tube Reservoir has a Brass Metering Jet pressed in there.

There's also a Brass Metering Jet at the near-bottom of the Reservoir Well.

What becomes a problem, ... is when the cavity at the junction of the two drilled passages becomes clogged with dried, fuel residue.

The Metering Ports of BOTH passages PREVENTS a sufficient amount of Cleaning Agent to enter and dissolve the solid.
Severe cases reject probing with wires, guitar strings and welders tip cleaners.

Don't LOSE a lot of time fooling-around with this and that and every-other thing if you encounter a severe clog.

Buy the Drill and unclog it.