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

2 Answers

Can I use unleaded fuel in Suzuki 450 GS?

hi , i would say this should be fine, however if you are worried you could use a fuel addative, you may also ask yourself how long they have been using unleaded fuel in Japan, regular servicing, with a keen eye on valve clearences is probably the best way to go, hope this helps, paul

Dec 30, 2010 | 1979 Suzuki GS 400 E

1 Answer

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

2 Answers

My ignitor keeps going out on my 83 suzuki gs 550L replaced last year and just had to again this year. I bought the bike from an older guy set up about 2 years to get it running in replaced that oil change...

my dear im having the same trouble only now i think my regulator is gone. check for wires damaged also check make sure all ur grounds are connected properly. check ur top coils and clean where they are bolted in because thats ur ground there. take off ur pick up coils in the bottom and check behind the magnets they may be slightly cracked.its worth the money to buy the manual and check ur wires. Do u have conections for parts? desperate!

Mar 06, 2010 | 1983 Suzuki Gs 550 L

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

2 Answers

I have a 1977 GS 750 and it runs but it makes a

valve adjust
compression test
carb adjust and timing ck

Nov 12, 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

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