Very Problematic GS650

[tom203]

Matchless-
The carbs were stripped completely, each body dipped overnight, all passages then cleaned with carb cleaner & had compressed air blown through. All O rings were replaced with the kit from cycleOrings.com.

Tom-
I did inspect the condition of all the diaphragms...might be pinholes though..? Hope not. I am determining the cylinders not running by exhaust feel and the fact that when they kick in there is a rush of exhaust out the right side pipe which is fed by 3&4.

Disconnect 3 or 4 plug wire and run it to see if it's just one of these that causing this surging. If you had pinholes in a diaphragm, it would likely be at edge, since this high flex area.

[JamesH]

I ordered those airbox clips...pretty cheap but gouged on shipping! oh well...

I'll inspect the diaphragm on 3 and 4...also ill try the plug wire deal.

Matchless- I do have the rubber plugs for the pilot jet in the carbs. They seems kinda hardend and definitely old...I was wondering about if the condition of those would affect the pilot circuit when I was in the carbs but i figured that they were alright...

As a side note, apparently this bike ran about 2 years ago. The owner originally gave it to me to look at because it had a charging issue. I have not even addressed this because I have just been trying to get the damn thing to run in the first place!

[850 Combat]

regardless of the work performed, it still sounds like pilot circuits. Due to a recent problem on one of mine, I like to spray cleaner into the pilot jet and make suer it comes out of all three of the other holes, the one at the butterfly, the one at the air screw, and the pilot air. I had the pilot air plugged last summer very stubornly on a 1000G. The pilot circuit has 4 openings that need to be clean all the way through.

The fact that you have trouble with the air cleaner fitting is also an odd situation.

[waterman]

So it looks like I've narrowed this down now to carburetor balancing. I guess this thread will now belong in the fuel/air/exhaust section eh?

Does anyone have any tips for adjusting the balancing screw between #2 and 3? I left all of the nuts loose from my dipping and reassembly with this in mind. It is very difficult to get to with the throttle/choke cable bracket in the way. Any tips?

You are right about the difficulty of getting to the balancing screw, I have used a long 1/4" extension with a swivel universal and 8mm socket to lock down screw. Invariably, I use a long cabinet makers screwdriver to adjust and then tighten with the swivel extension setup. It will be in rubbing on throttle bracket. You will find to leave screw a little "loose" so when you tighten nut it end right where you need it to be.

regardless of the work performed, it still sounds like pilot circuits. Due to a recent problem on one of mine, I like to spray cleaner into the pilot jet and make suer it comes out of all three of the other holes, the one at the butterfly, the one at the air screw, and the pilot air. I had the pilot air plugged last summer very stubornly on a 1000G. The pilot circuit has 4 openings that need to be clean all the way through.

The fact that you have trouble with the air cleaner fitting is also an odd situation.

The shaft 650 air box arrangement is a joy--not. The foam air filter goes around a D shaped filter cage that supposedly snaps into the outer clamshell cover. With this in position on outer element, you carefully position the D shape into a recessed groove on the inner portion. Once together, you slide in two clips, top and bottom to make everything solid. This is only made easier since that last thing you had in your hand is a nice freshly oiled foam filter. Anyone whom can do it without swearing or dropping one of the clips into nowhere land is beyond my pay grade. A pair of hemostats make the clips easier.

[tom203]

The shaft 650 air box arrangement is a joy--not. The foam air filter goes around a D shaped filter cage that supposedly snaps into the outer clamshell cover. With this in position on outer element, you carefully position the D shape into a recessed groove on the inner portion. Once together, you slide in two clips, top and bottom to make everything solid. This is only made easier since that last thing you had in your hand is a nice freshly oiled foam filter. Anyone whom can do it without swearing or dropping one of the clips into nowhere land is beyond my pay grade. A pair of hemostats make the clips easier.

Yes indeed- the rear brake switch makes for most of the fun, After much swearing, I found that if I put in the bottom clip first ( slides in from rear), then the top clip easily slides in from front.

[mlinder]

10v usually isn't enough to get spark that will work in a compressed area (or at all).