The 550 Project

[Flyboy]

You must also know, you are going to have headaches trying to get it to run without the airbox on, make sure it is on good and sealed up tight.

[Molino]

Carbs are really clean. I went over them yesterday to be completely sure. I hooked everything up today all nice and tight & I still get the same issue. Fuel is just not going through the carbs. What the ****?......

[cowboyup3371]

If fuel is not going through them then they are not clean. There are passages you cannot see that will get clogged up. Don't trust the fact the bowls look good to think they are clean.

Dip them properly and run a wire through each jet. Replace the orings. Follow Nessism's carb cleaning tutorial and you'll do fine.

[Molino]

It Lives!!!! Well, finally got it running. Now i'm having a problem of it idling too high. Air Leaks? Also I have pretty bad gas leaks comming from the float bowl's as well as the fuel tube. I am still running the stock O-rings, if I replace them with proper new ones you think it'll solve that problem?

[cowboyup3371]

Yes it is possible and more than likely necessary. You can also fiddle with the idle adjustment knob to see how well that plays.

[Molino]

Okay, so i got the carbs back from the shop, had them install the new Orings, and that kept them from leaking. Now i'm having the problem of the bike not starting without the help of starting fluid. I think when I brought the carbs back the mech may have messed with the float levels again, this is what its doing.

The first time I got the carbs back, the bike started right up just fine, just idled really high because I didn't have the carbs fully into the intake boots. With the help of some silicone spray, I solved that problem, but now it seems I'm at the complete opposite extreme.

Bike wont start up without the help of starter fluid. When it does start, the choke is fully engaged.
When I disengage the choke, it idles even higher. If I try and open the throttle, it dies.

Seems to me like he messed with the floats to the point where now they're closing off and not sending enough gas to the engine. Mostly just air with a little bit of gas. That would explain why it idles so high, and when I cut the choke off, it dies?

Its the same symptoms of an Air Leak, but insted the engine getting more air than gas because of the way the floats are set now?

Any thoughts my friends?

[cowboyup3371]

Take the carbs off the bike, remove your bowls, and measure the floats. Also, do another bench synch on the carbs since you really shouldn't trust the shop for that.

Edited to Add: It won't take much time to remove each of your jets while you are doing that so why not just give them a look see as well to check if they cleaned them properly.

[Molino]

Okay so removed the jets & got everything in between the Jets and the carb bodies themselves, squeaky clean. But I noticed something weird. On one side of each of the carbs they're running different Jets.

On the Right and outer side, its a 97.5 jet.
On the Left and inside, Its a 90 Jet.

It's like this for both of the Siamese carb bodies. Anyone know what the actual jet sizes are that are suppose to be in there?

[cowboyup3371]

Go here http://www.mediafire.com/?sharekey=3...17b31bfbde8fc1

and look at the bottom of his page for the database. If your carbs are like the 83 then you should be having 95s in 1 and 4 and 102.5s in 2 and 3

[Molino]

So the two middle cylinders are getting more fuel than the two outer cylinders? What's Suzuki possibly going on about here?

[7981GS]

So the two middle cylinders are getting more fuel than the two outer cylinders? What's Suzuki possibly going on about here?

Cylinder cooling on an in-line 4 cylinder engine where the center cylinders run much hotter perhaps?

Daniel

[Molino]

Finally got it running, took it for a spin, It's absolutely brilliant! And really f&$king scary!! I'm still a little jumpy from all the adrenalin .

Now the weird thing is, I cant get it to idle without providing a little bit of choke. If I give it full choke, it dies. Where's the A/F mixture screws on these Mikuni carbs?

And a photo for your personal enjoyment:

Sweet.

[cowboyup3371]

Your idle mixture screws are on the top at the front of each carb (engine intake side). Use the highest idle method to set it.

[bietau85]

Okay, so i got the carbs back from the shop, had them install the new Orings, and that kept them from leaking. Now i'm having the problem of the bike not starting without the help of starting fluid.
Any thoughts my friends?

Are you trying to ruin your carbs?

[Molino]

Yes, thats exactly what I was going for..... completely irrelevant but okay. I don't know about you but I don't baby this stuff. When I'm trying to get it to run, I'm trying to get it to run. If I had not done that, I wouldn't have found out my carbs were still dirty and there was a piece of gunk still caught up in them. Jeeze, whats with the hostility....

Cowboy, are those the small-ish flathead screws? It's the siamese carb setup, so It may be a little different from your traditional single-barrel, four carb setup. Cheers