GS550 with Mikuni Dual Throat Carb, No Info

[Nessism]

I had a tip stick like you describe once. Drilled out the bulk of the screw, but the tip was stuck fast.

I used PB Blaster down the passage, and several cycles of heat, using a torch. Not stupid hot, but enough to boil the oil. I also put a punch down the hole, trying to kick the tip sideways, breaking it free. I was almost ready to give up, when all of a sudden, the broken tip just fell out.

BTW, the best way I've found to remove stripped pilot screws is to drill a small hole in the top, and then pound a torx bit into the hole. That usually affords enough leverage to get it out. Of course, use plenty of penetrating oil and heat first. That's a given.

[dgates1]

Those videos are horrible.

Lol.. agreed. Not much out there. I wouldn't want to have to deal with this problem.

[Witehorse Motors]

Well needless to say I got burnt out on this project and still am. I finally got a 14K gold testing bottle of Nitric acid (said to dissolve brass and leave aluminum pretty untouched) and have been trying rounds of that today. Not really reacting to the screw much and so far no results. A few folks on forums and short vids claim success but I am not seeing it.

[Witehorse Motors]

UPDATE:

Nothing I did helped the stuck screw.
I located another set of carbs though!!!!!
Mated them together after a good cleaning, by hand then ultrasonic... I got the bike running with the enrichening cable pulled out some but seems like there was a air leak around the intake boot. racing idle. then a better idle but no response. Some spray also affected it ..
Gonna try and get it sealed better later.
This thing is chopped out with flowing 4 into 2 exhaust and some CRUDE homemade pod filters made from airbox boots, but even still
it should get to a decent idle and some ability to ride (with lousy mid range im sure, but I just want to send it home running and never think about it again, HA!!)

[Witehorse Motors]

Ignition

[Witehorse Motors]

Cleaning

[Witehorse Motors]

[Witehorse Motors]

[Nessism]

You should remove those Jet Needles, and clean everything...if you haven't already do so. Also, replace O-rings. Most of the O-rings are common with the other BS carbs, and I have a kit for those.