Pilot Jets

[fartypants]

My 80G is running a set of carbs from a newer model. the originals took irreparable damage in the big fire. I want to go up a step on the pilots, but don't know where to get the parts. I've read where there are two kinds with a different number of side holes. Mine have no side holes. Any suggestions where to get the jets? any part numbers since I don't know the application?

[natemoen]

You need the ones with the side holes. its a 2-1-2-1 patter. Mikes XS has them: http://www.mikesxs.net/products-39.html#products Pretty much any bike shop should have them as well just just take in the one you have and specify that you need the BS 30/96 and not the VM ones

[DGXSER]

Yep, there are actually three different styles of pilot jets I have seen in these bikes. The BS30/96 as stated are the ones you want, they have the 2-1-2-1 pattern. Then there is the VM type with 2-2-2-2 pattern. Finally the N151 which have no holes in the sides.

There has been many discussions about K&N carb kits being junk, and folks having issues getting the bike to run right after rejetting. IMO, alot of this all has to do with these three different styles of pilot jets and not knowing what is right or wrong. They all screw right in just pretty as a picture, but will not run for crap if the wrong types.

Another source fo jets is Georgefix on ebay. Contact him ans he can sell you jets. I have also bought them form the local shop for about $4 each.

[TopCatGr58]

Hey DG,

IIRC the XJ's carbs were the ones that used the no holes pilot jets?? However, when we worked on MadMaxim, his pilots had the side holes, but don't know if they were OEM or not???

Pants, does your set of carbs have the enrichener lever on the side of the #1 carb body, OR does it use a cable that runs up to the handlebars?? If cable, then it's the XJ carbs, otherwise, they are probably the 81 type, but that's also the 80 style as well! So you say you had some different style on your
80G because you're running some newer styled now??? Perhaps the PO had put on the 78-79 series style carbs, which use metal float valves, and are a bit more prone to leaking...flooding...leaking which could have been part of the reason for the fire???

Perhaps an XJ owner can chime in to confirm the no holes pilots or not??
T.C.

[fartypants]

no hole pilot jets

My carbs had a cable setup for the choke, I converted back to lever. The floats are plastic and carbs were jetted like the later models. 112.5 & 42.5 I believe - so they may be XJ carbs. I ordered some #45 pilots with the lesser number of holes and it threw the idle circuit way out. So I swapped them back out. Do you think I could solder up the holes on those?

[fartypants]

THANKS, I found what I need

SUDCO part number 004-611

Mikuni N151.067 (Non Bleed Type) page 135 of the catalog ,

man, they have allot of stuff.

[natemoen]

Man there was a thread I found awhile ago where someone was trying to figure out the differences/nondifferences between the different brands and numbers. I dont know if it ever was really figured out or the problem solved but I cant find the thread anymore. Might have been useful for this.

[WMarshy]

I remember that thread, cant find it though. There is a chart that shows the two different kinds of pilot jets. The main difference between the two jets were where the nozzle restriction in the jet is. One has the restriction up in the head (where the screwdriver slot is) and the other is in the very end furthest away from the screwdriver slot... I cant even recall which one is the correct type, just that it does matter what one you should use...

[cywelchjr]

I remember that thread, cant find it though. There is a chart that shows the two different kinds of pilot jets. The main difference between the two jets were where the nozzle restriction in the jet is. One has the restriction up in the head (where the screwdriver slot is) and the other is in the very end furthest away from the screwdriver slot... I cant even recall which one is the correct type, just that it does matter what one you should use...

Actually I'm guessing you COULD use either one, but that the sizing for the "wrong" ones would be totally different and you would have to spend a lot of time finding just the right starting point, which would be a waste of time since you can get the right ones and have guides for where to start for most different configurations.

[madmax-im]

Hey DG,

IIRC the XJ's carbs were the ones that used the no holes pilot jets?? However, when we worked on MadMaxim, his pilots had the side holes, but don't know if they were OEM or not???

Pants, does your set of carbs have the enrichener lever on the side of the #1 carb body, OR does it use a cable that runs up to the handlebars?? If cable, then it's the XJ carbs, otherwise, they are probably the 81 type, but that's also the 80 style as well! So you say you had some different style on your
80G because you're running some newer styled now??? Perhaps the PO had put on the 78-79 series style carbs, which use metal float valves, and are a bit more prone to leaking...flooding...leaking which could have been part of the reason for the fire???

Perhaps an XJ owner can chime in to confirm the no holes pilots or not??
T.C.

TC those were not the OEM pilots...they were Dynojets stg 3 which I had put in in'07...they were totally the wrong jetting... I never paid attention to the original jets so i have no idea if they had holes or not.

[bikerphil]

[SFerinTEXAS]

Note: BS 30/96 type Pilot Jets WITH Side bleed holes
holes and those without side bleed holes are
completely interchangeable.


That notation is included below the jet chart at MikesXS. I personally agree with it. My XJ has no side holes and runs fine all stock.

I have a 79 carb body in front of me and I contend the air mixes above the pilot tip and does not enter the jet chamber ( making the holes irrelevant )

To test my assumption will try to block off the jet tip area and blow air in the air jet and see if it can enter the jet chamber.That should put the hole question to rest.

[SFerinTEXAS]

the hole question to rest

Looks like a pun. I'll take it.

[natemoen]

Note: BS 30/96 type Pilot Jets WITH Side bleed holes
holes and those without side bleed holes are
completely interchangeable.


That notation is included below the jet chart at MikesXS. I personally agree with it. My XJ has no side holes and runs fine all stock.

I have a 79 carb body in front of me and I contend the air mixes above the pilot tip and does not enter the jet chamber ( making the holes irrelevant )

To test my assumption will try to block off the jet tip area and blow air in the air jet and see if it can enter the jet chamber.That should put the hole question to rest.

Yes they are interchangable but from my understanding the A/F mixture will be different with a jet with holes in comparison to a jet without holes.

You could take a no hole and use it as a replacement for a jet with holes but most likely you would need a different number jet than what you had just to compensate for the different mixture rate of the different style jet.

[SFerinTEXAS]

Another thing I noticed on the XJ carbs was that to convert the enricher from cable to pull it would be necessary to drill holes for the detent ball and spring and to thread the side screw holes for the pull bracket as these are not present on the XJ setup.Should not be hard to do. Of course the xs detent rod would also be required.