98+ 750 Carb

[rperry03]

Can someone please tell me what the empty threaded spot on the lower left corner is for and is it supposed to be like that?
And is that screw in the center at the bottom to the screw you get to after you drill out the plug?
Thanks!
First time posting an image let's see if it works.......



Internet is too slow to load, here is the link
https://imgur.com/gallery/y2b13

[shpielers]

Yes your 2n description is accurate, that's the A/F screws there

[Kreylyn]

Can someone please tell me what the empty threaded spot on the lower left corner is for and is it supposed to be like that?
And is that screw in the center at the bottom to the screw you get to after you drill out the plug?
Thanks!
First time posting an image let's see if it works.......



Internet is too slow to load, here is the link
https://imgur.com/gallery/y2b13

The threaded hole bottom left is not used (that I remember off hand). It's not uncommon for the carb bodies to be used for other applications and there for all of them made the same way. Another bike they are used on may need that threaded hole as part of it's configuration.

Yes, A/F screw for the center bottom.

Krey

[rperry03]

Okay thanks guys!
This bike had lean issues when I rode it 10 miles home and was making sure that wasn't a major vac leak.

Soooooo.... It was obvious that these carbs were already apart. During disassembly I noticed that there was already a 114 main jet (guessing dynojet) but the clip was on the #1 groove on the needle and not #3. Would this be just an error of someone replacing it the same as stock and not reading instructions or another? Wondering if this was the primary cause of the low speed driveability

[Kreylyn]

Okay thanks guys!
This bike had lean issues when I rode it 10 miles home and was making sure that wasn't a major vac leak.

Soooooo.... It was obvious that these carbs were already apart. During disassembly I noticed that there was already a 114 main jet (guessing dynojet) but the clip was on the #1 groove on the needle and not #3. Would this be just an error of someone replacing it the same as stock and not reading instructions or another? Wondering if this was the primary cause of the low speed driveability

Mikuni Jets have a symbol on them, it's a square inside lower corner of a square.

What's the setup on the bike? What exhaust, air filter, air box?...

Generally I'd guess it's probably setup incorrectly, yes... but... more info is needed for tuning purposes.

Krey

[rperry03]

Stock air box, and filter, yosh slip on
Really weird carbs, I'm uploading pics now, should only take another hour or so on 3G lol
There's no overflow for the floats and I really don't see a spot to sync carbs with the exception of the vac port.
I'll post when they uploaded or at least a link

Installed a dynojet kit couldn't afford a factory or Ivan, already over budget by $500 or so.
114 main, E clip on third groove, and 2.25 turns out. Waiting on float level gauge to arrive tomorrow, my good caliper gauge is somewhere in storage

[rperry03]

https://imgur.com/a/grGX2

[shpielers]

Vac port is what you sent for syncing
Best of luck

[rperry03]

Sorry, I was referring where to adjust, not the port to hook the gauges up to. It's been about 12yrs since I performed this so my old brain is a little foggy lol

[Seft]

There are three screws to balance the carbs between the bodies. Set 3 & 4 with screw between them, then 1 & 2 with screw between them and finally 1&2 with 3& 4 with the centre screw.