Question about 1981 Suzuki GS 750 L

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Which Fuel?  I have just bought a GS 750L. Having trouble getting the thing to run properly. Have had the carbs balanced but no difference. I have put in unleaded but should I put in LPG instead. It has electronic ignition, new leads, plugs, caps etc. It will start first time but will backfire and sounds very lumpy. Have tried advancing and retarding the the timing. The carbs have been stripped and cleaned. I dont know what else to try now.

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I have a gs 750 engine not sure is it l type or e how do i tell year all i see on engine is gs750 54695 has kick start and points

Posted on Nov 11, 2008

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The owners manual says to use gas with Octane of 90.

Posted on Nov 10, 2008

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I have 1981 suzuki gs 750L i just got the carbs cleaned, and they are spotless, and "tuned" by an old harley guy, but now im having a very difficult hard start when it is cold, and it will idle...


Sounds like the carbs are set too lean and/or the floats are too low. Do you notice that the engine seems to get hotter than it used to? That is a definite indicator of a lean condition.

Jun 24, 2011 | 1981 Suzuki GS 750 L

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I have a 1981 suzuki gs 750 engine on a quad. i finally got it running but it runs poorly. i cleaned the carbs twice and put new spark plugs in it. its running on the two cyclinders that farthest away from...


Is the fuel tank located above the carburetors at about the same level as the original bike? If not, you may have to install an electric fuel pump to get the pressure at the carburetors about the same as the original bike (guessing about 1-1/2 to 3 PSI). I assume that you have checked things like firing order, timing, throttle slide balance, compression, and equivalent exhaust system. Did you see and hear the engine run before you installed it into the quad chassis? Hope some of this helps!

Jul 09, 2010 | 1981 Suzuki GS 750 L

1 Answer

Motorcycle, BMW F650 GS engine or electrical cutout / cutoff??.


If your spark plug is the culprit, it will eihter not run or run badly but you won't do any harm by replacing it. Did you drain the carb when you laid it up. If not the fuel evaporates and coats the inside of the carb with a varnish. It is good that you can ride it, but the first thing I would look at is the carb, strip it and clean it, blow out the jets and see if it makes a difference. As irritating as it is, I don't think the problem is a sinister one.

Apr 01, 2010 | 2001 BMW F 650 GS

1 Answer

My 84 Suzuki gs650 sounds great at about 4 grand but wont even think about running under that. Had carbs sync and everything. Stumped in Highland!


Assuming each of the carb butterflys are opening and closing properly and in sync, and balanced properly, the problem is likely to be hardened rubber ducting and seals between the carbs and the cylinder. A good seal is needed so that un-carburetored outside air does not get into the fuel mix after the carbs. This leans the mix and makes the engine rev high. Any cracks in the rubber manifold can also let air in. Please rate my answer. Thanks.

Feb 17, 2010 | 1982 Suzuki GS 650 GT

1 Answer

1981 Suzuki 750L. Wont start properly


Sounds like the battery you have in the bike has gone bad sence you have to jump start it all the time. And yes the bike will run bad cause the cdi need a good voltage to work correctly. Get new one and put in new asid in and put it on the charger till it is fully charged and you should be good to go.

Dec 06, 2009 | 1981 Suzuki GS 750 L

1 Answer

I have a simular problem to (By ithacaautomo on Jun 28, 2009) with my 1982 Suzuki GS750e. Except the bike runs worse as it warms up. I've cleaned the carburators and they didn't look bad to start with....


See which plugs are running good (cream to light brown) color look at the other carbs. make sure you have no cracked rubber or flat o- rings or other vacuum leaks. You will need vacuum syncronizer or a set of good vacuum gauges to balance the carbs properly. If there is a filter it will be between the tank and the carbs. you might want to pull the valve and screen out of the gas tank, and make sure everything is clean and in good shape.
jordan

Sep 30, 2009 | 1981 Suzuki GS 750 L

3 Answers

1983 suzuki gs 750 New airpods and jets. Bike not running right


You are dealing with Suzuki vacuum carbs, you cannot just replace the air box and re-jet. What you are running into is there is no pressure to raise the diaphragm because there is no restriction to create such vacuum. Either put the stock box back on or go to the biggest main jets you can buy. Sometime even when you get stage 3 jets you still have issues. Vacuum carbs are not made to run with no restrictions.....putting aftermarket exhaust on it will make things much worse.

Jul 24, 2009 | 1977 Suzuki GS 750

3 Answers

Carburerettor Suzuki GS 750E


The GS bikes do have a fuel pump that is part of the petcock. This pump runs off of a vacuum line from the carbs. The carb bank is also made to run with the air-box in place. It will also not run right without the stock exhaust system in place. The engine would have to be re-jetted to properly run with a different exhaust system.
The engine will never run right without the air-box unless you get a vacuum gauge and properly tune the carb bank without it. Anyway, to fix your fuel pump problem, you may be able to install just the pump somehow, in between your tank and carburetor assembly.
You'll have to change several things to make this engine work as a go cart engine and be dependable.

Jun 18, 2009 | 1979 Suzuki GS 750 E

1 Answer

Bike dies as soon as it is started!


first you need to remove carb clean them , then new gaskets . sounds like they are glazed due to old fuel drain tank and refill with new fuel

Jun 04, 2009 | 2005 KTM SX 250

1 Answer

2nd cylinder not getting hot and leaking fuel from it


Assuming the carbs were rebuilt properly, this sounds to me like a carb float being stuck open. Turn off the gas and drain the offending carb. Next, turn the gas back on and sharply tap the float bowl with the plastic handle of a screwdriver as the fuel bowl refills. The goal here is to vibrate the float to free it up. If doing this process a couple of times does not free the float I would remove the carb and look at the float chamber fo any problems such as stuck float, float level not set correctly, and the correct installation of the main jet.
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Use an air hose to dry out the cylinder then install a new spark plug AFTER you make sure that the cylinder is getting spark. Be sure to balance and sync the carbs when finished.
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Please rate this solution.

Mar 17, 2009 | 1977 Suzuki GS 750

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