Question about 1979 Suzuki Gs 550 L

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1979 gsx 550 suzuki gas isnt going to plugs

My bike has good air flow and suction. The gas is going to the carbs and comes out of the gas tank fine and yet the spark plugs are not wet with gas or anything. Back by the air filter doesn't have any scent of gas. Please help.

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  • 216 Answers

CK FLOAT AND NEEDLE VALVE IN CARBS SOUNDS LIKE THEY NEED TO BE CLEANED AND ADJUSTED.

Posted on Apr 22, 2014

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Posted on Jan 02, 2017

  • 101 Answers

SOURCE: Engine skips, won't go over 55 mph. Works fine below that.

Hi ..... Go through the above list, pay particular attention to fuel delivery ie blocked breather in tank, any filter fitted to tap or change in line filter if fitted. Easy to check, take off fuel delivery to carb (place container to catch fuel), start bike and fuel should come out a strong contant flow.
Let us know how you get on.

Posted on Jan 20, 2009

  • 1 Answer

SOURCE: 1996 Suzuki GSX-R 750 T

they will more than likely fit but doubt that it'll run smoothly

Posted on Apr 02, 2009

  • 3567 Answers

SOURCE: Bike won't stay running

Drain the carburetors. There should be a screw on the lower side of each CARB float bowl. Remove the screw then replace it after the fuel drains. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Install new stock NGK spark plugs.

Remove the CARBS from the bike.
FOR EACH CARB > Remove the float bowl and clean the entire
CARB with a spray CARB cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the CARB. Remove the idle screw and the air screw on the outside throat of the CARB and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
CARB back together, clean the air filter and install the CARB. Install an in-line fuel filter. Let the float bowl fill then start the engine.

BALANCE THE CARBS
Turn the throttle screw on the LEFT CARB one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left CARB to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT CARB one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right CARB to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both CARBS. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each CARB such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other CARB.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other CARB so that the slide on that CARB just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both CARBS begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Turn the idle screw on each CARB EXACTLY ONE HALF turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed. Congratulations, you have just balanced and synchronized your CARBS This should fix the problem. One last and VERY IMPORTANT thing, Have a fire extinguisher handy and ready for use any time you work on or with he CARBS.

Please rate this solution. Thanks throttlejock!



Posted on Apr 22, 2009

  • 296 Answers

SOURCE: my gs500f is back firing through the CARB. the

Lean mixtures burn very slowly, at times slowly enough to continue burning through the power and exhaust stroke, causing a backfire when the intake valve opens, and that flame gets a shot at the new mixture charge.

In normal operation, as the engine slows, the fuel delivery from the main circuit falls off, and the idle circuit is supposed to take over. If the idle circuit flows insufficiently, that becomes a transition to fuel starvation.

You can try pointing an unlit propane torch into the inlet air, and see if you can get closer to an idle while supplying a supplementary fuel source. You will need to do this in a way that gets propane to both carburetor inlets, maybe rigging a Y with vacuum hoses and electrical tape...

This started with work on the carburetors, so the fuel system would be the most suspect. That, and the fact that it will run at higher RPM would seem to rule out fuel delivery.

I was looking around at photos while developing this answer (needed to know whether this was a twin or a 4-cylinder), and one resource said the idle speed should be 1,200. I don't know if that's right, but maybe 1,000 RPM is too slow for this motor to keep it together. (I do doubt that, though.)

When I wrote that last sentence, I started to second guess myself, thinking "What if the fuel shutoff(s) is/are vacuum operated, and as the bike approaches idle there is insufficient vacuum to hold it/them open?" But the I rejected that, because there is even less vacuum at cranking speeds, yet the bike starts.

Posted on Jun 26, 2010

  • 3567 Answers

SOURCE: 81 Suzuki gs650 #2 carb floods gas out after start

The float is stuck open in the leaking carb. Remove the float bowl and clean the carb after removing the pin holding the float in place. While the float is out, shake it to see if gas has gotten inside it. If so, you will need a new float or will need to drain the float then re-solder it to seal it up again. To drain the float chances are you will need to drill a vent hole in it to allow the gas to drain. Just solder the vent closed when done.

Posted on Jul 14, 2010

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1 Answer

Suzuki 750 Katana Hoses?


Hi, Alexander always check your service manual for proper routing, PVC type valves, and vent lines allow the following components to breathe freely:
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May 10, 2017 | 1997 Suzuki GSX 750 F (Katana)

1 Answer

Gas is not sucking through to the engine..bike is turning but not starting


IF YOUR 750 IS ANYTHING LIKE MY 1979 850 THERE ARE VENT/VACCUM LINES ON THE TOP SIDE OF CARBS ONE OF THE VACCUM LINES MUST GO TO GAS TANK TO GET THE FUEL PETCOCK TO PROPERLY OPEN AND ALLOW GAS TO FLOW CONTINUOUSLY TO FLOAT BOWL

Sep 27, 2010 | 1979 Suzuki GS 750 E

1 Answer

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not 100% sure if this is a fuel injected bike...if it is...maybe the fuel fillter needs changeing...if its a crab engine....try cleaning the carbs out!!

Mar 31, 2010 | 1997 Suzuki GSX-R 750 V

2 Answers

Suzuki gn 125 lacking power


I assume you dumped out the half pint of old gas and rinsed out the tank. Get a new spark plug and clean the air filter. Remove the carb and dis-assemble it then soak the parts in denatured alcohol for 30 minutes. Do not soak the rubber diaphragm. Finish the cleaning with a can of spray carb cleaner from the auto parts store. Be sure all internal fuel and air circuits are clear and that the diaphragm is not torn or has pin holes. The top cap must have a good seal. Go to www.babbittsonline.com/parts/viewbybrand/parts.aspx to see a diagram of the carb and the rest of the bike. It looks like they have lots of parts for your bike.

Feb 09, 2010 | 1994 Suzuki GSX-R 600

1 Answer

Just bought my first bike: 1995 Suzuki 600 Katana. Heres the problem: its been sitting for 7 years. Emptied gas tank, cleaned carb but is flooding. Put new battery in it and air filter is dirty but not...


When you cleaned the carb, did you get the needle valve put back in correctly? That is the small pointed valve that is actuated by the float. As gas flows into the carb it raises the float and the needle valve rises to shut off the gas flow. You should have put compressed air through the hole that the needle valve goes in. There is a removable jet that the needle valve tip goes into to shut off the gas. Remove a spark plug after trying to start it. If the plug is very wet it means the carb is flooding, and if it is dry it means the motor is getting no gas. If the plug is dry you can take off the air cleaner boot and pour a tablespoon of gas into the carb opening, then quickly try to start it. If it starts momentarily you know you just need to work on the carb. You also could remove a plug, put a teaspoon of gas into the cylinder, replace the plug and try to start it, to see if you get a pop or two. Put some Seafoam in the gas to help clean the carb. Make sure you use compressed air to clean out all the small passages in the carb. An owners manual would tell you exactly how to adjust the float level, but I think you can assume it's okay if you didn't do anything to it. Generally the gas shuts off when the float rises until it's about level. When you take off the bowl of the carb, before removing the carb from the bike, there should be gas in the bowl, but it shouldn't be overflowing.......somewhere around half full. Also, are you getting good compression? If that bike has a kick-starter it would be easy to determine if the compression is okay. If there is not much resistance to the kick-starter, or pushing the bike in high gear, the compression is bad and valves may be stuck or burned. Let me know how your project is going.

Jan 01, 2010 | 2005 Suzuki GSX 600 F (Katana)

1 Answer

Engine hard to start gets hot and no power checked carbs their ok


fouled spark plugs...intake manifold leak... you could have a vacuum line come off or isnt on all the way. bad batch of gas..weak coils, or poor compression. or the choke could not be operating properly. also running too heavy an oil could cause this problem, you should run 10w40 only.

Oct 05, 2009 | 1989 Suzuki GSX 550 EF

1 Answer

I bought a 1985 GS 550 LF. It had been sitting for a year, so battery was dead tank & carbs were dirty, clutch cable was broke. I fixed the clutch cable, cleaned the gas tank, bought a new battery and...


Gas pouring out of the carbs means the float pin are not sealing in thus the over flow.
Go a little down thn .77in , best would be to bench set them.
Take a pipe say from the tank to the feed pipe of the carbs (best would be to remove the tank and place it higher on your work bench to get the gravity flow to the feed pipe of the carbs)
Allow the flow to the carbs and monitor the over flow, see which carbs over flow, remove the float bowl and reset the float and let it go a little less thn .77in, refit the bowl and retry the feed in and recheck..you will come to a point where gas wont over flow, open the bowl and see the level of the gas , it should be covering the jets, but remember that since you will have the float bowl out the gas will show low as when its submersed, the jet stem in the float bowl pushes the gas level up so dont get mixed up when you see the level low , i am sure you will be able to judge it for yourself.
I had the same problem in myYamaha(seca) XJ750R !981and finally managed to win over the problem going over it the way I explained.
Hope this helps! Good luck.

Jul 14, 2009 | 1984 Suzuki Gs 550 L

1 Answer

Bike wont start


there are 3 things you need for the bike to start. fuel, air, and fire. you checked the fuel so make sure your air filter isn't completely stopped up. if it is fine then you need to replace the spark plugs or possible the coil packs. i'd do spark plugs first. they are alot cheaper.

Jun 28, 2009 | 2002 Suzuki GSX-R 600

1 Answer

79 gs550 - uh ohs in wiring...


When you reassembled the bike did you pinch any of the wiring harnesses? Trace the wiring through the bike and make sure everything has a solid connection between their respective power sources and activation switches. Alot of time bikes run wiring under the gas tanks so you need to make sure that you didnt cut anything when pputting it back on (if you removed the tank)

Jun 15, 2009 | 1979 Suzuki Gs 550 L

1 Answer

Engine skips, won't go over 55 mph. Works fine below that.


Hi ..... Go through the above list, pay particular attention to fuel delivery ie blocked breather in tank, any filter fitted to tap or change in line filter if fitted. Easy to check, take off fuel delivery to carb (place container to catch fuel), start bike and fuel should come out a strong contant flow.
Let us know how you get on.

Jan 20, 2009 | 2004 Suzuki VL 800 Volusia

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