GS550 Acting Over-Jetted

[Mr.humbucker]

Here are a few good Youtube video's that will help guide you. https://www.youtube.com/watch?v=aidJvpMTiIo This guy is quite interesting and plays some funky tune overtop of the work.
Here's another .... https://www.youtube.com/watch?v=dD3UWtLfzX4
And the last good one ... https://www.youtube.com/watch?v=TGqUAtsP3_o

I use an ultrasonic cleaner, simple spray carb cleaner and and a good JIS screwdriver (phillips style) Japanese Industrial Standard I believe. They're different than the North American philips screwdriver. The other KEY is a new 3/16th long shaft screwdriver worth about $5 at a half decent hardware store. This will be the key to removing the pilot jet. Those little buggers can be a bit of a challenge. Heat up the surrounding part of the carb where they're sitting if you experience much resistance. This 3/16th screwdriver are also perfect for the air/fuel screw removal. Make sure you clean out each little passageway. The bottom of the pilot jet is tiny - a wire from a bread bag/twist tie is usually the right size. Be patient, take the time to clean it all including the passageway in the float bowls as they get clogged and you may miss this in a superficial cleaning. Be sure to blow compressed air through all passages when you finish to ensure they're clear and free of water ... it doesn't burn well

I always get my O Rings from Cycle O Rings (mentioned here) and I get new plugs off ebay:
https://www.ebay.com/itm/Suzuki-carburetor-CARB-RUBBER-PASSAGE-PLUGS-gs1100-gs1000-gs850-gs750-gs650-oem/292243134260?hash=item440b0c5734:g:sx8AAOSwt0tZd-7p

Lastly I replace the screws with stainless caps screws cuz they're easy to work with and look nice 40 of these https://www.boltdepot.com/Product-De...x?product=6408 and 8 of these https://www.boltdepot.com/Product-Details.aspx?product=6417

Good luck - you'll be glad you did this as long as you take your time and don't "force" anything - that's when I usually bugger up a jet...I got a lot of help from the fine folks here

[leecatd8209]

Awesome, thank you for the advice. O-rings are on order, and then once I get them apart it'll be time to order jets. I've rebuilt a few quadrajets in the past with varying degrees of success, but I attribute some of the to them just being worn out.

My biggest fear is the throttle shafts leaking when I get done, but hopefully I can tune most of that out if it does occur. I'm not looking for peak performance, it'd just be nice to have the option to pass somebody if I need to, haha.

[gsrick]

Awesome, thank you for the advice. O-rings are on order, and then once I get them apart it'll be time to order jets. I've rebuilt a few quadrajets in the past with varying degrees of success, but I attribute some of the to them just being worn out.

My biggest fear is the throttle shafts leaking when I get done, but hopefully I can tune most of that out if it does occur. I'm not looking for peak performance, it'd just be nice to have the option to pass somebody if I need to, haha.

You don't need to take the throttle shafts out unless the bushings are worn. At 8,400 miles I doubt they are.

[leecatd8209]

Tomorrow's the big day, the last of the parts arrived, hoping I can take it for an evening cruise.

Wish me luck!

[leecatd8209]

I got the carbs all cleaned up, and put back on. I seem to have a vacuum leak between the carb boots and the head. The boots, as well as the O-rings are new and installed tightly.

Any common stuff I should hunt for?

Edit: Big vacuum leaks fixed. It still comes down tonidle a little slow, though.

Now it won't start once It's hot, and I got a couple backfires through the exhaust. Time to play with the valves I suppose.