Boorrrringggg Build/Rebuild/Refres&restore

[puskrat]

the arrows are not pointing at the screws
screws are in slides

[puskrat]

these screws. photo from carb cleaning 101

http://i121.photobucket.com/albums/o...ningfun009.jpg

[Prothec]

Next question: There are no screws. What does this mean?

You're screwed... no really, what screws where?

[puskrat]

Next question: There are no screws. What does this mean?

[puskrat]

You have the right diaphragms. I don't recommend messing with them (ie removing from the slide) if there isn't a problem or you're risking damaging an expensive part. Those are aftermarket from JBM Industries (http://www.jbmindustries.com) and they require the plastic ring to be cut off. They have the thick donut instead of the plastic retainer. It's important that you put the slides back in facing the correct direction because there isn't a notch in the diaphragms. The hole in the slide needs to facing the engine side.

Edit: BTW, I put those diaphragms in my '81SH and they are high quality and will continue to use them in the future.

Thanks Pro. The diaphrams look heavier duty than the pix I see in the diaphram thread (I think that was kat's). All other things being equal, that should make them more durable, but not if they don't fit. Thanks for the reassurance, but I see another post indicates they're for a different model carb. I'd rather go with your take, since you've btdt. Have to consider all possibilities I guess. And yes, the plastic rings were absent. Need to look things over better.....hadnt noticed hole in slide.

[3Phase]

The BS-34 and the 73 molded into the diaphragms shows they're for the '80 to '82 BS-34III with 73mm slides and I'm assuming that you didn't have to chimp out to get it to fit over the slide and put it back into the carburetor with the cover.

One week later....

[...]


3. reassembled, top view.

Carburetor slide Tech Tip:-

http://www.xs11.com/forum/showthread.php?t=33250

.

[Prothec]

You have the right diaphragms. I don't recommend messing with them (ie removing from the slide) if there isn't a problem or you're risking damaging an expensive part. Those are aftermarket from JBM Industries (http://www.jbmindustries.com) and they require the plastic ring to be cut off. They have the thick donut instead of the plastic retainer. It's important that you put the slides back in facing the correct direction because there isn't a notch in the diaphragms. The hole in the slide needs to facing the engine side.

Edit: BTW, I put those diaphragms in my '81SH and they are high quality and will continue to use them in the future.

[puskrat]

One week later....

Diaphrams I removed. Well, one of them, anyway.....


1. slide and diaphram separate





2. diaphram only, upside down.







3. reassembled, top view.






"]
4. reassembled, lower view.




Do i have what looks like a right part? I know the PO did (claims to have done) a full rebuild on all the carburetors, and I am reasonably sure some of his choices for components were questionable. I see the "BS 34" molded in the lip of the membrane, but a great man once told me "There are lots of BS 34s, and they're different."

[puskrat]

GOOD NEWS! TWO MOAR SLIDES LOOSE

dropped them back in place til i can get time to disassemble.
For those of you who keep logs to help out newbs like me...what worked was alternating a hosing with spray carb cleaner, then a couple days later a dose of Penetrating Blaster, then a couple days later back to carb cleaner.

I sprayed the intake side and the top of the slides. one of the POs had replaced the diaphrams with the heavier units which pull off the slides (no, I am NOT sure this is correct OR compatible, but it's what is there) and they were already off before I applied any chemicals.

[jetmechmarty]

There are a lot of BS34's. My XS650's have BS34's. They look identical to what's on the XS1100. They are not the same! I had to learn that the hard way.

[puskrat]

argh I mess up so much I need to not have that "ten minute limit" on editing my posts.

that looks way more like making sense. You guys are lifesavers!

jetsrus.com is where I intend to get my parts, but their CS guy told me their site is structured by carb type first, and I've seen nothing that says BS34 Mikuni. So I stumble around hoping I'll find something that looks reasonable, and then try to zero in on what's right. it's not working. Thanks again xs11.com XSives!

[puskrat]

that looks way more like making sense. You guys are lifesavers!

[bikerphil]

Pilot jets....

https://jetsrus.com/a_jets_by_carburetor_type/jets_mikuni_BS_30-96_pilot.htm

Large round main jets....

https://jetsrus.com/a_jets_by_carburetor_type/jets_mikuni_N100-604_main_Large_round.htm

[bikerphil]

Something is not right, they should come in increments of 2.5, can you give a link to the supplier you are using?

[puskrat]

Thanks Phil. Which immediately brings me to my next question. The Tech Tips chart shows main jet size is 137.5. When ordering I find only whole numbered jets, no fractional sizes. should I get a 136 and drill it out? If so, is there a thread where I can get familiar with the practice before I start destroying things? Am I doing this all wrong, and should I wait until I have everything out to try to understand jet selection?