DavidD wrote on 12/31/69 at 16:00:11:John,
Do you happen to still have the part #'s for the two screws you got from Ron Ayers? I think your "wrong" screw sounds like my "right" screw.
Thanks,
Dave
Dave,
Sorry, I struck out altogether here. Can't find the picture of the two screws side by side; which I had posted in another thread here, but appear to have deleted from my website AND computer!
So... I broke down and went out to the garage to dig through the 'leftover' parts boxes. I know I saved the one screw I ordered from them in the bag it came in; which would show the real Suzuki part number. But danged if I can find it anywhere!
Even found a couple of shipping "bill of materials" from Ron Ayer's, neither of course included the screw/jet in question. Finally logged on to their site and searched my past orders and found their part #: 13279-47070 but it did not look like the one that came from my Mikuni:
That is a picture of the Ron Ayer's page for our LS-650PH model's version of the Mikuni (BG40 isn't it?) At the bottom is the silhouette of the actual screw I pulled out of my 87. It looks just like the screw in the picture to me, but the one they sent me from that part number did not. A warning here: you've already noticed that each dealer uses a slightly different parts numbering system, and not the factory numbers. Real convenient for cross referencing huh?
While pulling my screw out, I discovered that it was only set at 1/2 - 3/4 turn out instead of the 2 turns I thought I'd left it at. And as I mentioned before, there was no spring under my screw from the factory. Unless the old man who had the bike before me replaced the screw without a spring; as I know that he had recently cleaned the tank and carb before I bought the 87, but I assumed he hadn't been into the idle screw circuit. I guess you can by the plug to replace over the screw so it doesn't show you've been in there tinkering.
Oh, best I could see down in the hole with my magnifying glass, if there is a small o-ring and washer covering it down in there, I couldn't see it. I'm not inclined to go digging around down in there either, since the setup I've got works well.
Anyways... just as you, I'd like to get this issue resolved once and for all: Which screw and associated assembly of parts are the correct ones for our 87 models?
If I get time tomorrow, I may dig back into my parts boxes and see if I can find that elusive screw... but for now this is all I have...