VM 28 SS on 1980 KZ1000 A4

VM 28 SS on 1980 KZ1000 A4, do they have o-rings for the pilot screws? I do not have any o-rings in mine.

Thanks

Per kawasaki.com, 1980 KZ1000 A4 carbs on Canadian models have 0-rings on the pilot air adjuster screws, part #16038-022 still active and used on many Kaw vehicles through 2008.

See #32 on diagram.

From parts list:
32 16038-022 "O" RING

Good Fortune!




Edit -- Diagram for Canadian model shows only 0-ringed pilot screw. The U.S.A. model diagram shows both 0-ringed and non-0-ringed, with notations at bottom of parts listing that U.S.A. model uses non-0-ringed version and metal plug.
The carb assembly for U.S.A. also shows fuel pump, whereas Canadian model doesn't.
The jet needles and needle jets are also different between U.S.A. and Canadian models.

Thanks AGAIN Patton, I will order them through my local Kaw dealer.

I tried spraying carb cleaner at the screws and it did not change the idle at all so I figured they were not needed.

I also had the 2 air bleed ports blocked off, DOH! which I found out about in another post.

Turtle wrote:

...tried spraying carb cleaner at the screws and it did not change the idle at all so I figured they were not needed....

figured they were not needed--- may well be correct, and the 0-rings may not fit onto the #31 screw.

Hold the order :ohmy:

Just noticed U.S.A. A4 diagram on kawasaki.com showing a variation of the pilot screw with a #50 plug and #31-1 pilot screw without an 0-ring.

The #31 (0-ring without plug) and #31-1 (plug without 0-ring) have different part nos.

Am guessing the #32 0-ring may not fit onto the #31 screw.

Maybe yours had an oem #50 plug which was later removed. This would be the "tamper-proof" plug intended by EPA to prevent us air-polluting reprobates from fooling with the fuel mixture.

[Add to Picklist: 92066-1051]
50 92066-1051 PLUG,PILOT SCREW 4 X KZ1000-A4~

[Add to Picklist: 16014-1020]
31-1 16014-1020 SCREW,PILOT ADJUSTIN 4 X KZ1000-A4~




I'll look over at Z1E's A4 carb kit.

Good Fortune!

Z1E's A4 carb overhaul kit seems to include both type pilot screws. But difficult to be certain because the kit includes extra parts to cover slightly different carb models.
Also has what appears to be a replacement plug.
Click > Z1E A4 carb overhaul kit

Z1E's dynojet kit includes drill bit and sheet metal screw to remove the plug, jet needles, clips, and spacers, and two different size main jets, for four carbs. No 0-rings.
Presumably re-use existing non-0-ringed pilot screws without the plugs.
Click > Dynojet kit from Z1E

After diagrams, parts lists, and kit parts are considered, and no effect from spraying WD40 over the existing non-0-ringed pilot screws, am thinking you may be okay without the 0-rings, and likely never had the 0-rings which probably won't fit existing pilot screws anyhow.

Good Fortune!

Am uncertain about some parts in Z1E's A4 carb kit:

It is just like the "Pilot screw non-O-ring with plug".

Is there a better option?

Turtle wrote:

It is just like the "Pilot screw non-O-ring with plug".

Is there a better option?

Because the well-respected Dynojet Kit eliminates the metal plug and continues using the same non-0-ringed pilot screw, and there being no air leak indicated by the WD40 spray test, I would think everything's okay without needing to replace the existing non-0-ring pilot screws with 0-ringed versions.

In event of a pilot circuit issue, and no air leak indicated by the WD40 spray test, or other carb issue, I would suspect something other than lack of an 0-ringed version pilot screw.

Good Fortune!

Turtle wrote:

VM 28 SS on 1980 KZ1000 A4, do they have o-rings for the pilot screws? I do not have any o-rings in mine....

Is there a performance issue that raised concern about the possibly of missing pilot screw 0-rings?

Good Fortune!

Yes, spitting back through both intake and exhaust at idle and deceleration intermittently. Otherwise runs great and very fast (or it was, keep reading)

I asked this question in another thread: kzrider.com/index.php?option=com_kunena&...ew&catid=4&id=367248

I may have overwhelmed everyone with questions in this thread.

I did have a bad stator and replaced it yesterday and wanted to let the silicone setup where the wire grommet goes though the stator cover, so I did not personally run it with the breathers open and the stator fixed.

My son just called me and he said the mis-fire is not as bad, may just need to play with the pilot screws.

Last week I found a thread about the fuel galley in carb #2 where the bowl feeds the accelerator pump, so I cleared that out as it was clogged, and it now revs when cold where it did not rev before until fully warmed up. But since I cleared this passage the mid range to WOT is noticeably slower, I assumed it was now rich and dropped the mains from a 117.5 down to a 112.5 after I put the stator in yesterday. My son just rode it and he said it's still slow, it was great on mid range to high end before cleaning this passage.

Will have a sparkplug picture sent to me tomorrow to see how they read after about 30 miles are put on it.

Also the idle hangs at about 3,000 rpm when you decel to a stop, if while stopped or moved slow with the brake on, you can slipm the clutch a little to load it up and the idle comes down. So I will be taking the advancer apart and cleaning/lubricating on Saturday and checking the springs.

how did you solve this issue? My 81 is doing the same thing. was it the advancer? did cleaning it work? where is this advancer? I am also backfiring and spitting back through the #1 carb, but I'm pretty sure the rings are bad on that piston because I can see a little bit of oil leaking. please help? I just got this bike and don't know much about it.