Old yosh pipe. Jetting.

[Billyboy]

Thank you muchly!

[KEITH KRAUSE]

OK. I was gonna give you some jetting suggestions using the stock jet needles and separate Mikuni jets but since you've ordered the DJ kit...
My typical sermon first.
Be sure the bike is ready to re-jet. Clean carbs, floats set very close to .94", fresh inner o-rings and manifold o-rings, good condition manifolds, fresh fuel/vacuum lines, good fuel flow, clear venting, valve clearances, good spark/ignition timing, etc.
That kit is designed for use with K&N filters and a quality pipe. Your Yosh pipe should be a good pipe, based on Yoshies I've seen before. I hope it has no leaks though. That also means no leaks at the head due to re-used gaskets. Don't try to over-tighten the bolts if you get leak related decel' pop. About 10 ft/lb is max' for the header bolts or you risk stripping.
Use the DJ 138 mains. Test/plug reads at full throttle.
Place the jet needle e-clip in the 4th position from the top. The lower (down the needle) the e-clip is positioned, the richer the setting. Be sure the two factory plastic spacers are re-installed in factory order...thicker (ring) directly on top the e-clip and thinner spacer directly under the e-clip. Test/plug reads at solid 1/3 throttle.
Keep the stock 15 pilot jets. I'm assuming your pilot fuel screws (underneath) are at factory settings, about 1 turn out from LIGHTLY seated? If so, then turn them an additional 1/2 turn out (CCW) richer. Fine tuning may be necessary later. Test the pilot circuit at steady 35 mph (minimal throttle) in 4th/5th gear.
Initially set the side air screws to 1 3/4 turns out.
Remove the 2 floatbowl vent lines and leave the ports open.
Bench synch the carbs for both fully closed and fully opened positions. I have a detailed easy to do VM carb synch post around here somewhere. A search should find it. If you need it and can't find it, it's part of Hoomgar's thread ("GS1K bad fuel economy/re-jet attn Keith Krause"), or something like that.
After all the above is done, you can start up and adjust the side air screws using the highest rpm method. The bike should be on the centerstand and it must be fully warmed up.
At a base idle of 1,000 to 1,100 rpm's max, start at any carb. Slowly turn a screw in either direction until you hear the rpm's max out. The sweet spot is generally between 1 1/2 and 2 turns out. Once that carb is set, return the idle, if necessary, to the base idle by using the idle adjuster knob. Repeat to the other 3 carbs.
Now you can hook up your vaccum tool to vacuum synch the carbs. This is a mandatory part of jetting in my opinion. You can't really trust the plug reads and gauge any performance issues unless the carbs are synched well. Use two large fans and don't over-heat the motor. If synching is new to you, ask for any tips before synching.
Now you can test at the various throttle positions.
Good luck!

[Billyboy]

Thank you!Thank you!Thank you!:-D:-D

[KEITH KRAUSE]

OK. Let us know how she runs.