Now Hands-On Help Needed Carb cleaning in Tampa Fla.

[Schming]

SG Jet Needle ?

I'm rebuilding Jeff's carbs and I've noticed, by the screw heads, someone has been into the jet needles.

CMIIW but the gap in the clip-washer-plastic gizmo is not supposed to be there as it will allow more fuel to the mix:



Also is this the correct order for these parts ?



TIA

[motoman]

Nope, springs flips around other way,IIRC. That's what holds everthing down in place, resolves the play that you were concerned with. If it was other way around prior, likely was PART of the running issue.

[Schming]

So install the spring in the barrel first, under the plastic piece ?

And yes, this is how all 4 were when I disassembled them.

Edit: Or do you mean just flip the spring 180 degrees where it sits ?

[3Phase]

So install the spring in the barrel first, under the plastic piece ?

And yes, this is how all 4 were when I disassembled them.

Edit: Or do you mean just flip the spring 180 degrees where it sits ?

If Jeff has a 1980 Special then here you go! Fresh from Mama Yamaha's vintage heirloom collection is this snippet from their 1980 XS1100SG carburetor catalog:-

https://www.dropbox.com/s/vj9mxiba62yjs13/XSSG_NDL.png

27 98580-03008-00 SCREW, PAN HEAD

29 3F7-14936-00-00 SEAT, SPRING 8 ea
30 3F7-14589-00-00 SPRING 4 ea
31 3F7-14952-00-00 WASHER, PLATE (7Y2) 4 ea
32 256-14919-00-00 CLIP 4 ea
33 3F7-14918-00-00 RING 4 ea
34 452-14116-16-00 NEEDLE Not Available 4 ea
35 3H5-14940-00-00 DIAPHRAGM ASSEMBLY 4 ea

Have fun!

.

[motoman]

So install the spring in the barrel first, under the plastic piece ?

And yes, this is how all 4 were when I disassembled them.

Edit: Or do you mean just flip the spring 180 degrees where it sits ?

Just flip it so smaller coil end is against clippy. When all together and in slide you see that pushing up on metering rod is the play U were talking about. Spring pressure keeps that from happenin', as there's no 'mechanics in a can' in there with pesky fingers playing with things when all is installed.

[Schming]

Just took apart my other set of later carbs and the order of parts for the jet needles are plastic piece on bottom - "e" clip - washer - spring - hold down plate, which makes sense as the hold down plate secures pressure on the spring against the washer against the "e" clip against the plastic piece to fully engage the jet needle into the needle jet which wasn't happening with Jeff's carbs and NO amount of tuning would've got them running correctly.

Thanxs for the reply motoman got me thinkin' and I had to run back out to the garage so I could call it a night

[Schming]

Just flip it so smaller coil end is against clippy. When all together and in slide you see that pushing up on metering rod is the play U were talking about. Spring pressure keeps that from happenin', as there's no 'mechanics in a can' in there with pesky fingers playing with things when all is installed.

I thought that was what you were referring to but on a second look the spring is the same size both ends so the washer takes care of that.

[Schming]

If Jeff has a 1980 Special then here you go! Fresh from Mama Yamaha's vintage heirloom collection is this snippet from their 1980 XS1100SG carburetor catalog:-

https://www.dropbox.com/s/vj9mxiba62yjs13/XSSG_NDL.png

27 98580-03008-00 SCREW, PAN HEAD

29 3F7-14936-00-00 SEAT, SPRING 8 ea
30 3F7-14589-00-00 SPRING 4 ea
31 3F7-14952-00-00 WASHER, PLATE (7Y2) 4 ea
32 256-14919-00-00 CLIP 4 ea
33 3F7-14918-00-00 RING 4 ea
34 452-14116-16-00 NEEDLE Not Available 4 ea
35 3H5-14940-00-00 DIAPHRAGM ASSEMBLY 4 ea

Have fun!

.

Thanxs Scott, looked for half hour for that and decided to take five minutes to pull the barrel out of my spare '80 SG carbs

[3Phase]

Thanxs Scott, looked for half hour for that and decided to take five minutes to pull the barrel out of my spare '80 SG carbs

Hey, a spare XS to pull apart for comparison works too!

I don't trust Yamaha 100% because I know for a fact that some of their parts diagrams/lists are wrong but they did get the carburetors right on this one.

.

[motoman]

Yup...as I stated, couldn't remember for sure, unless I had one out again. Just knew that play was taken care of by the spring if assembly order was correct.......and don't imagine it would hardly run at all if FUBAR'ed previously.

[motoman]

BTW Schming, if you still got those metering rods out, take a magnifying glass(unless your eyes are better than mine) and look around on the side at the top of those rods and see that their 5GL16 metering rods. Those were on the 80-81 Specials and verifies that they ARE in fact Special carbs. Jetting IS 110mains across all four if that's the case. The Standard used 5NZwhatever rods and had staggered 115 outside cyls. and 120 inner two cyls. mains. That nonsense can be dropped in those cases and run 115's across all four.
Point being, the Specials and Standards, 80-81 had way different metering rods. Those in pic look to be the longer pointy ones of the Specials.

[Jeffintampa]

my word

Wow, all I can do is shake my head in wonder.......

[3Phase]

Here you go, Brant, Schming:

Mark	Slots	Length	Dist.1	Dia 1	Dia2	K1	K2	K3	K4	K5	K6	A1	A2	A3

5GL16	1	51.000	3.000	3.000	0.000	16.800	20.800	34.800	0.000	0.000	0.000	1.45	3.00	7.00

5GLZ18	5	50.500	3.000	3.000	0.000	16.300	20.300	34.300	0.000	0.000	0.000	1.45	3.00	7.00

5GZ6	5	52.500	3.000	3.000	0.000	17.200	39.200	0.000	0.000	0.000	0.000	1.45	8.00	0.00

5IZ7	1	51.800	3.000	3.000	0.000	16.800	34.800	0.000	0.000	0.000	0.000	2.15	8.00    0.000

1980 SG/SH = 5GL16
1978-79 All = 5GZ6
Crazcnuk = 5GLZ18 (jet needle replacement from Canada that didn't work)
1980 G/H = 5IZ7

1982 J = ?

I'll have to dig up the XJ11 carburetors and get the Mikuni jet needle number.

Download: Mikuni Jet Needle Excel Spreadsheet jnlist3.xls ~790k | Hungarian website

Reference thread:-
Post#91: Help Find A Cure for Crazcnuk's bike?

.

[Jeffintampa]

Just took apart my other set of later carbs and the order of parts for the jet needles are plastic piece on bottom - "e" clip - washer - spring - hold down plate, which makes sense as the hold down plate secures pressure on the spring against the washer against the "e" clip against the plastic piece to fully engage the jet needle into the needle jet which wasn't happening with Jeff's carbs and NO amount of tuning would've got them running correctly.
Thanxs for the reply motoman got me thinkin' and I had to run back out to the garage so I could call it a night

so hence my gas leak out of the airbox?

[Schming]

BTW Schming, if you still got those metering rods out, take a magnifying glass(unless your eyes are better than mine) and look around on the side at the top of those rods and see that their 5GL16 metering rods. Those were on the 80-81 Specials and verifies that they ARE in fact Special carbs. Jetting IS 110mains across all four if that's the case. The Standard used 5NZwhatever rods and had staggered 115 outside cyls. and 120 inner two cyls. mains. That nonsense can be dropped in those cases and run 115's across all four.
Point being, the Specials and Standards, 80-81 had way different metering rods. Those in pic look to be the longer pointy ones of the Specials.

Check. Yep all jets, needles, emulsion tubes, mains, etc. are correct for the '80SG.
I appreciate the tip and yes, the only way I can determine that they are, is with a lighted magnifying glass.