Question about 1979 Suzuki GS 750 E

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Carburerettor Suzuki GS 750E

Could someone please help me to solve a problem. I bought a GS 750 E engine and fitted it in a gokart. I have a fuelling problem. It seems to me that the engine does not get enough fuel. It starts with Quick start but only runs for a little while.

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  • gbvanwyk Jun 19, 2009

    Thanks for your response. I am using 2 lawnmower fuel tanks. It is mounted above the set of carbs. No fuel pump. Does the original fuel tank have a built in fuel pump?

  • gbvanwyk Jun 19, 2009

    Thanks again for your response. It is slide carbs. One of the 3 outlet pipes (overflows?) sucks when the engine swings. Could it be that this pipe needs to **** fuel from the fuel line? The other 2 pipes do not ****.

  • tombones May 11, 2010

    Is the gas tank higher than the top of the carbs? Is there a fuel pump in the tank?

  • Matthew Hazard
    Matthew Hazard Apr 03, 2014

    check the float heights. if not set to specs then the carbs will not receive enough fuel.

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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.

Posted on Dec 01, 2009

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Are you using a fuel pump? If not you will need to have the fuel tank mounted above the carburetors for gravity feed. If this is not the problem try cleaning the carburetors and check for ripped diaphrams.
-John

Posted on Jun 18, 2009

  • indy650
    indy650 Jun 19, 2009

    the motorcycle didnt have a fuel pump so as long as the tank is mounted above the carbs you shouldnt need one. If you happen to have a fuel pump you could try it but your problem is most likely the carburetors. Most old bikes have vaccum carbs and if you take the top off theres a rubber diaphram make sure thats not ripped. Then disassemble the bottom of the carbs and make sure all the jets are clean. unless this engine ran fine before you took it out of the bike?

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Check the float heights. if not set to specs then the carbs will not receive enough fuel.

Posted on Apr 03, 2014

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