Mikuni BS/CV and VM O-ring Kits

[Nessism]

Hey Nessism

I have a 1983 KZ1100 LTD that has BS34 Carbs, difference being that the choke is on the carb body instead of the handle bar. Do you have an O-ring Kit for these?

Yes I do. There are a number of differences between the Suzuki and Kawasaki kits, including the pilot screw, drain screws, and pilot plugs. PM me if you want a set.

 

[Finesse150]

Any chance of a 1980 450L kits yet?

 

[espm-03]

Hey Ed,
I'm trying to PM you and see if you carry any
1979 suzuki gs750L o-rings kits.

Appreciate it if you could reply to this message.

Thanks,
Mauri

 

[Nessism]

Hey Ed,
I'm trying to PM you and see if you carry any
1979 suzuki gs750L o-rings kits.

Appreciate it if you could reply to this message.

Thanks,
Mauri

Hi Mauri,

Yes, I have those O-rings.

Please send me a PM, not a visitor message.

Thanks in advance.

Ed

 

[espm-03]

Hi Mauri,

Yes, I have those O-rings.

Please send me a PM, not a visitor message.

Thanks in advance.

Ed

I'm trying to send a PM but it says " Can not send message. User Nessism has exceeded their private message quota." Not sure if I'm doing something wrong

Sincerely,

Mauri

​

​

 

[SamLack99]

Ordered 4th Jan

Delivered 16th Jan

From the US to the UK - Now that's what I call service.

Thank you.

Just waiting on a few parts to come in from CMSNL and I'm ready to put my carbs back together again.

 

[Nessism]

Ordered 4th Jan

Delivered 16th Jan

From the US to the UK - Now that's what I call service.

Thank you.

Just waiting on a few parts to come in from CMSNL and I'm ready to put my carbs back together again.

:friendly_wink:

 

[Nessism]

Just wanted to drop a note of thanks to the community for all the O-ring sales support. As of this posting, there have been 95 shipments of O-rings for the GS community. Interestingly, for the KZ crew, for which I also offer VM and CV kits, there have only been 12 shipments. In fairness to the Kawasaki boys, I don't offer a 550 kit, though. GSR folk here are to be commended for realizing the importance of a proper carb rebuild. Do the (carb rebuild) job right the FIRST TIME, and PROFIT!

 

[Wallowgreen]

Ordered o-rings 7/15, in my mailbox 7/19.

Can't beat that! Another happy camper.

This is a critical service.

Thanks again Ed

 

[Griffin]

Hi Ed. I notice above you said you don't have a kit for the KZ550. I recently picked up a 1981 KZ550A with the TK 22mm VM carbs on it. The bike has sat for years. I haven't done anything to it yet other than check compression.

If I sent the carbs to you and paid return shipping costs, would you be willing to create an o-ring kit for them?

We can disccuss further via DM if you'd prefer.

 

[Nessism]

Hi Ed. I notice above you said you don't have a kit for the KZ550. I recently picked up a 1981 KZ550A with the TK 22mm VM carbs on it. The bike has sat for years. I haven't done anything to it yet other than check compression.

If I sent the carbs to you and paid return shipping costs, would you be willing to create an o-ring kit for them?

We can disccuss further via DM if you'd prefer.

Rock ON! I'm your guy! Please send a PM so we can discuss.

I rebuilt a set of those carbs a couple years back, and (sadly) can't remember the specifics, regarding O-rings and such.

What I do remember, is that the choke flaps come loose on those carbs, so some extra measures are required, or the mechanism can break loose, and get ingested by the engine.

There used to be a super cool, and knowledgeable dude on KZ Rider, who was an electrical and 550 expert. Sadly, he passed away. A massive loss to the community. I have no clue who is paying his old web hosting fees, but his old pages are still accessible. I strongly suggest you download all the content you can from these pages, before they go away...

https://s3.amazonaws.com/gpzweb/index.html#home

 

[Griffin]

Thanks for the link, Ed. Lots of good information there.

I'll PM you after Christmas to discuss details.

 

[Nessism]

Feeler post...

I've been doing choke plunger rubber seal replacement for a few years now. I do these on carb rebuild projects, where the client wants a fully "restored" set of carbs. For normal "rebuilt" carbs, I don't do this. The original plungers are used as is, and in most cases, they work well enough, even though the seals may be deteriorated.

Recently, I cut apart both a VM and BS/CV plunger, in order to better understand the size of the plunger "cavity", where the seal resides. What I learned is that the VM carbs need a 7.0mm diameter rubber donut, and BS/CV carbs need 7.1mm.

I made a couple of tools to punch out new seals from 2.0mm Viton grade A rubber sheet. I stack these seals on a rotating mandrel, then shave them down, truing them up for an exact fit.

I'm considering offering the seals for sale for customer install, or offering an "exchange" service; send me your plungers, and assuming they are in rebuildable condition, I'll send refurbished plungers back to you.

Does this sound like something anyone here would be interested in? If so, please respond, or send me a PM.

BTW, member Zed, offers a choke plunger rebuild service currently, and I don't want to insult his great service. Being that I'm already providing O-rings, this seems like a logical add-on, though. Zed offers his plungers using Viton grade B material, mine are Viton grade A. Grade A is a little softer, than grade B. For ultimate durability, send your plungers to Zed. To my way of thinking, though, Viton grade A is better than what Mikuni used back in the day (most likely Nitrile).

 

[Wallowgreen]

Without the special tools you made for the job, how difficult would it be to pull out the originals?

What about installing the new, simple press in by hand?

Could be a simple add on for me, especially with bikes I intend to keep so I'm interested.

 

[zed1015]

Without the special tools you made for the job, how difficult would it be to pull out the originals?

What about installing the new, simple press in by hand?

Could be a simple add on for me, especially with bikes I intend to keep so I'm interested.

Depending on the condition of the old seals it can be very tricky and time consuming getting them out as many times they can be as hard as plastic so won't simply pull out and unless the seals are undersize or the incorrect shore rating ( i.e too soft ) it is impossible to reliably fit new seals by hand without either damaging the seal or the original rolled brass securing edge.

 

[Nessism]

Without the special tools you made for the job, how difficult would it be to pull out the originals?

What about installing the new, simple press in by hand?

Could be a simple add on for me, especially with bikes I intend to keep so I'm interested.

An overnight soak in carb dip, will cause the seal to greatly soften and pooch out. A pick tool can then easily remove the seal. A torch can also be used, but this requires more care.

To install, first coat the seal with silicone grease or similar. Push the donut down over the plunger peg, and tuck it under the lip on plunger cavity on one edge. Push the seal down, working it under the lip on the plunger. Using your fingernails, work around the plunger and push the donut into the cavity, to the extent possible. You can usually get about 3/4's of the seal past the lip, using your fingernails. Then, I use an old pick tool that I reformed into a spoon shape, and a small screwdriver, and work the seal into the plunger. The Viton is tough, and doesn't tear easily. Just be careful to not press with any sharp edges.




.

 

[Nessism]

Over the years, I've received numerous requests for GS450 O-rings, but I don't sell a kit for those.

The 450's, through 1982, used a somewhat unusual set of carbs compared to the common Mikuni BS carbs used by other GS bikes, but the later '83+ year carbs, are more common to the other bikes.

I recently bought a set of later year 450 carbs that I plan to rebuild, and verify O-ring sizes in order to sell a kit. Stay tuned for details, but I'm pretty sure the O-rings are similar to the common CV carbs. These kits will include O-rings for the pilot screws, drain screws, and float valves. That's the extent of the O-rings used on these carbs.

For those wanting an O-ring kit for the early 450 carbs, as near as I can tell, there are only two types of O-rings for those: for the drain, which I think I have (same as VM29 smoothbore), and the pilot screws (which I haven't verified). If anyone has some of these carbs, and a set of calipers, please contact me so we can hone in on the required sizes.

 

[bren]

For those wanting an O-ring kit for the early 450 carbs, as near as I can tell, there are only two types of O-rings for those: for the drain, which I think I have (same as VM29 smoothbore), and the pilot screws (which I haven't verified). If anyone has some of these carbs, and a set of calipers, please contact me so we can hone in on the required sizes.

i have the older carbs (and some digital calipers). there are three o-rings. the float bowl drain plugs, the emulsion tubes, and the mixture screws. you can still buy the bowl plug o rings (13249-41310) and the emulsion tube o rings (09280-03003) from places like suzuki parts house. For the screws, I found on this forum -

"The adjustment screw takes a 1.25mm x 3.8mm [i believe this is cross section x inner diameter]. This one shouldn't be too tough to find.​" It wasn't, and I can confirm that this size did indeed fit on the screws.

i'm getting some new o rings in the mail in a couple of days since i screwed mine up. i can measure them before they go in. although you can find online that the o rings for the emulsion tubes should be either 1.05x3.1mm or 1.1x3.1mm, i wasn't able to find this size o ring anywhere. [edit: I confirmed with calipers, the emulsion tubes take a 1.05mm c/s x 3.1mm id x 5.1mm od]

 

[dgates1]

Hey Ed,

I sent you a PM for a set of o-rings for the carbs on my 1982 GS1100G. BS34's

Used the old PM thread we had from my last order.