GS650E Carb woes

[waterman]

The petcock diaphragm is good, trust me lol. Besides, as I ran it last night, it was by use of a separate gas reservoir, with the petcock vacuum line capped off. The float valve points are in good condition, and the springs were still springy. I personally don't really see this as being the problem.

How then do I measure the fuel height in the tubing? Do I just bring the tubing up to the side of the carb and let gravity do it's trick with the gas?

Somehow, according to the service manual, you are to measure the fuel level when the bike is idling with the tube alongside of the bowl. I have no idea how you would check the inner carbs with the motor running unless you have leprechaun hands.

I first check to see what float height is and then check fuel level. Like Mr. Ness said, the fuel level check is best. I use a plastic vacuum tubing connector screwed into the drain hole in the bowls. I connect a piece of clear vinyl tubing and then proceed to check level with carb rack firmly secured in my trusty 6" bench vise. I use a piece of wire to secure the tubing alongside the carb body. I try to set the carbs at the same angle as they are attached to engine. Then it is simply check one carb, drain gas, adjust and check again until fuel level is correct. It is tedious but it does dial the carbs in.

I have cheated in past and used water as opposed to gasoline to check levels, that way when I had a leak it wasn't stinking flammable gasoline all over my bench. I believe it will show you how far off the floats are. It has been a few years since I have needed to do this so I am a little fuzzy.

[EZ_650]

So I've been looking around for replacement #175 pilot air jets and I have had little to no luck. I'm still stuck wondering how the bike ran so good when I got it if I have but one #175 pilot air jet sitting around. All the rest are #160s... Suzuki_Don, are you 100% sure that the E's have #175s? Explain to me how could that be, because the only visible differences between an E and G are the Es have smaller main jets and slightly larger starter jet (which make no difference). If the pilot jet is the same, how could I be running rich with stock G jetting minus the bigger 110 main?


Anyway, I found some jets at http://www.pjmotorsports.com/mikuni-jets.html, but they are for B42/55 Carbs, apparently. Without looking at the parts for my BS32, a 6mm long air jet just sounds too long. But if it is the right diameter and threading, then I suppose it could be usable.

What do you all think?

[EZ_650]

And LarryA_Texas: I will try to run the bike again and turn the air screws in, and see if that leans it out.

[Flyboy]

I know this may sound stupid, but have you checked that your chokes are sealing fully and not letting fuel drizzle through when closed?
I might have missed it, but I did not see it mentioned yet.
Just a thought.

[Suzuki_Don]

So I've been looking around for replacement #175 pilot air jets and I have had little to no luck. I'm still stuck wondering how the bike ran so good when I got it if I have but one #175 pilot air jet sitting around. All the rest are #160s... Suzuki_Don, are you 100% sure that the E's have #175s? Explain to me how could that be, because the only visible differences between an E and G are the Es have smaller main jets and slightly larger starter jet (which make no difference). If the pilot jet is the same, how could I be running rich with stock G jetting minus the bigger 110 main?


Anyway, I found some jets at http://www.pjmotorsports.com/mikuni-jets.html, but they are for B42/55 Carbs, apparently. Without looking at the parts for my BS32, a 6mm long air jet just sounds too long. But if it is the right diameter and threading, then I suppose it could be usable.

What do you all think?

OK. The only place you will find the GS650E carb specs that I know of is to look up the microfiche diagrams and the jets on the diagrams have the size against them in the left hand column. See picture below. Sorry it's a bit fuzzy but you will get the picture, excuse the pun.



The reason that the jets are so different between the "G" and "E" in my opinion is to do with the air intake system. If you look at the two different microfiches for the two models you will see what the differences are. And anything that slows air down coming into the carburettors will then require smaller fuel jets to compensate. Study the microfices and I think you will understand.

the best ones to view if you don't have a parts book is the Alpha-sports website.

[EZ_650]

Thanks for the information Don. Despite your supplied info, I stopped by the Suzuki store (because I was near and had time), and sure enough the parts guy showed me that same fiche and he confirmed they were discontinued and unavailable. That I figured, but thought it was worth a shot. Plus I like window shopping for accessories, and bikes, and such... Anyway the parts guy told me he used to have some GS's and told me he would remove the air cleaner lid. I didn't really say that I would or wouldn't do that, but thanked him anyway and left. Of course, I am not going to take his advice.

When I cam home, I got online and went back to http://www.pjmotorsports.com/mikuni-jets.html and bought three of the bs42/55 air jets, in #175 size. They look identical to my jets, so figured why not. Unfortunately, they won't ship until Tuesday. I am excited again, and I am anticipating their arrival.

[Suzuki_Don]

Thanks for the information Don. Despite your supplied info, I stopped by the Suzuki store (because I was near and had time), and sure enough the parts guy showed me that same fiche and he confirmed they were discontinued and unavailable. That I figured, but thought it was worth a shot. Plus I like window shopping for accessories, and bikes, and such... Anyway the parts guy told me he used to have some GS's and told me he would remove the air cleaner lid. I didn't really say that I would or wouldn't do that, but thanked him anyway and left. Of course, I am not going to take his advice.

When I cam home, I got online and went back to http://www.pjmotorsports.com/mikuni-jets.html and bought three of the bs42/55 air jets, in #175 size. They look identical to my jets, so figured why not. Unfortunately, they won't ship until Tuesday. I am excited again, and I am anticipating their arrival.

Well done, it takes a bit of research sometimes to find this info out and to my knowledge this fiche is the only place that has the jet sizes for the 650E as it was a lesser known and available model.

I too am waiting for a set of #175 air jets to turn up from one of the members on here.

Good luck

[EZ_650]

Well everyone, I put the 175 air jets in, and while it seems to be running a bit better, she is still running a bit rich... Particularly it's obvious because of the excessive smoke out the left tail pipe. I have yet to check the fuel level, plan on doing that next.

Would that really cause it to run so rich at idle though?

Ugh, right now, I just want to sell this thing. Even if I get it running right, I think it will end up being sold soon anyway. I'm at the point in my life where I'm trying to consolidate projects, not make more. Plus school and everything. For the right price I'd probably even sell it right now...

[chef1366]

Well everyone, I put the 175 air jets in, and while it seems to be running a bit better, she is still running a bit rich... Particularly it's obvious because of the excessive smoke out the left tail pipe. I have yet to check the fuel level, plan on doing that next.

Would that really cause it to run so rich at idle though?

Ugh, right now, I just want to sell this thing. Even if I get it running right, I think it will end up being sold soon anyway. I'm at the point in my life where I'm trying to consolidate projects, not make more. Plus school and everything. For the right price I'd probably even sell it right now...

What do you have in the carbs now? I'm sure it is in this thread but maybe I can help you.
Is your intake/airbox sealed?
Valves adjusted?
Good compression?
Good spark and at least 12 volts at the coils?
Cam chain timing on?

[EZ_650]

What do you have in the carbs now? I'm sure it is in this thread but maybe I can help you.
Is your intake/airbox sealed?
Valves adjusted?
Good compression?
Good spark and at least 12 volts at the coils?
Cam chain timing on?

Ah see, I hate to sound lazy, but I'm getting tired of taking time to work on this darned thing.

The intake and airbox are sealed. I thought about checking valve clearances, haven't yet. I can check compression, will post back results, it will be cold compression though. Timing shouldn't be off...

How do I go about checking the 12V at the coils?

Keep in mind this thing is old, but it only has 46xx miles on it.

Thanks for offering a helping hand btw.

[chef1366]

To check the volts at the coils disconnect the head light, pull the fuel tank, turn on the ignition and with a multimeter on DC 20 volts check the O/W wire going into the coils.

[EZ_650]

Coils are getting 12V. My plugs have been getting pretty sooted, I've been cleaning them off between running it each time.

I pulled the valve cover only to realize that I the smallest gauge I have is .05mm. Just by looking at the inside of this motor, it would be hard to believe that the valves clearances are any different then when they left Japan 28 years ago.

Now, I need a new valve cover gasket (the old one tore in one spot when lift the cover), but in the mean time I'm going to try to fab up a fuel level gauge. I think that should point me in the right direction because as I type this in the garage, I see fuel leaking out of the 1-2 overflow vent... *sigh*...

[tom203]

Ah see, I hate to sound lazy, but I'm getting tired of taking time to work on this darned thing.


Keep in mind this thing is old, but it only has 46xx miles on it.

It doesn't matter if it has 4k or 40 k miles, it's almost 30 years old. You can't "look at the valves" and bet they haven't changed since they left the factory- you have to buy the gauges and actually check or you're just wasting your time. Just maybe this bike has never see maintenance since its boat ride.

[EZ_650]

I have yet to had time to fab up a fuel gauge, or even get around to buying a new valve cover gasket (money is TIGHT!). I hate to say this, but...

Is anyone interested in my 650? With school and all, I really don't have time or need for this bike. I'm trying my best to consolidate my belongings. I regret the thought of not being able to keep it, but it is for the best that someone gives it more love than I can, and gets more in return from it than I have been given. Contact me via PM if you're interested.

Thanks all, Drew.