20 Most Recent 1979 Suzuki GS 750 E Questions & Answers

CHECK THE POWER TO THE COIL, AND FROM THE COIL TO THE SPARK PLUG; TAKE ONE OUT LAY IT ON THE BLOCK CONNECTED TO THE WIRE, NOW CRANK THE ENGINE AND LOOK FOR A SPARK. NO SPARK NO POWER. CHANGE THE COIL.

Check the fuse box first then use a multi meter to check for earth and power feeds to the lamps.I would start with the rear one first

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You will likely have to rejet the carburetors due to the more open intake

Not exactly sure what you mean by "number" but i purchased two new ignition coils and my 1978 gs750 runs like its fresh from the factory. here is the link where i purchased them. http://www.regulatorrectifier.com/catalog/1977-1978-Suzuki-GS750-GS-750-Ignition-Coil

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.

There are 2 coils. The coil on the left provides spark for cylinders 1 & 4. The coil on the right provides spark for cylinders 2 & 3. The firing order is 1-2-4-3. In case you don't know, this little tidbit is something to carry with you for life: Whenever a reference is made to a place in or on a vehicle, it is ALWAYS the perspective "from-left-to-right" of the seated vehicle operator. In other words, in your case, as you're sitting on the bike, cylinder #1 is the one furthest to your left, and #4 is furthest to your right.

Hi I had the same problem with my gs it was valve clearance they were to tight

more than likely one of the coils died or plug wire insulation is rotten and it's arcing to the frame, be sure to check all wiring connections before you buy anything.

clean all earth connections and re-try