1978 Suzuki GS 750 E - Answered Questions & Fixed issues

Hi,if these are halagin bulbs,when you put them in the connector you must make shore that you dont tuch the glass as the oil that is in your skin will shorten the life of the bulb dramaticly,hope this was some help,all the best.

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Get a test light. Hook clip on - side of battery. Turn on turn signals and ck wires. The light will flash, that is the + wire. If turn signal has only 1 wire hook that to the + wire. The - connection will ground through frame and complete the connection.

On the one that has two hoses does it still have an "Off" position? Usually petcocks that have two hoses, one goes to the carb vacuum, and the other is for a fuel supply for the engine. That way it only allows fuel to flow when the engine is running. I have found these to be a poor design and can often leak and allow fuel to run into the engine if your carbs are acting up. If the replacement only has one hose, then it will work fine, just be sure to cap off the vacuum port on the carb.

besure the gas is on at the tank if still problem try removing the gas line and catching the gas in an empty can it may flow slow or not at all there is a small screen in the petcock that get easily clogged w/ rust from the tank itself

DOES IT SOND LIKE ITS TRYING TOO IF SO PROB CARB IF NOT BAD CDI CONNECTION AND OR ENGINE PROBLEM AND OR BAD SPARK PLUG WIRE PLUG ETC

i recently just installed air pods on my 82 gs 850. Installed 155 jets, the stock jets were 115.

go to www.bikebandit .com and pull up your bike and go under wheels,tires,final drive and make sure you have it put back together just like the diagram shows you because it sounds like you might not have the bearing spacer lined up just right or might have accidently put one of the bearing spacers on the wrong side i have seen this many times even by the pro's and make sure you torque it to specs.please let me know if this helps if not we will figure it out.

Hi you can down load detailed info on how to set up your carbs on www.thegsresources.com

Go to this site and you can download a free PDF service manual.
www.carlsalter.com/motorcycle-manuals.asp They have a single manual for a GS750. It is for a 1976. That is close enough to your '78 to still be very useable.


Can I get a “very helpful” rating on this answer?

Could be a sticking float, clogged jets, restricted fuel flow( filter etc)' loosen drain screw in each of the 4 carbs, this is the lowermost screw try and catch the fuel in a container, you should have a similar amount from each carb, a lesser amaount from any of the carbs would point to a problem in that particular carb.

if its factory jets then there just dirty or need ajust--bigger ones can be risky cause tuning them wrong can burn ur engine--bike is 30yrs-bout time for carb rebuild--buy a haynes or clymer book for maintenance details

Yes, yes, and no, and I don't know. You could have blown a fuse, but it seems it would be showing other symptoms if you did. THe age of the battery is a good indication of condition, over one year old, suspect, over 2 years old, definitely could be in need of replacement. Check the water in the battery and fill it to the level with bottled water, or rain water, no minerals, then get one of those floaty ball testers and check the electrolyte fluid weight, One dead cell, the battery is shot. Could have been not enough time to charge it back it up. A battery charger needs to run all night. So, check it out, hope this helps.

95% of the time centre is on forward is reserve and back is off, simple way to make sure is remove the hose at the tap and try it like that, you will have 2 positions where fuel is flowing, on and reserve, the 3rd off.

Could be a number of reasons
1-your main jets are too big
2-float level to high
3-blocked exhaust
4-points or CDI(please confirm)
5-carb manifold rubbers leaking

Please get back especially No4*

needs just a little more air on your idle mix screw and if that won't fix it, take your carb slide out and drop the inlet needle down 1 notch so as to take a little fuel away during idle, that makes it come on more crisp & clean

Remove the gas tank then run the new cable along side the old cable. Unhook the old cable at the engine then hook up the new cable. Now remove the old cable from the bike. Give the cable adjusters all the slack you can get then hook the cable into the clutch handle. Pull the outer cable outward and hook the end of the outer cable on the outside of the adjuster. Pull the lever in all the way then release the lever while pulling on the outer cable. This should allow you to snap the cable end into the adjuster fitting. Below is a generic photo. Please rate my answer. Thanks!

Did the bike run fine previously...or unknown history?

Does it crank the starter normally?

Have you verified with a grounded spare spark plug that the ignition is actually firing as you crank starter...if not...might be an interlock problem....is neutral light on...have you tried with sidestand up and clutch pulled in? Kill switch ON?
Usually the interlocks prevent cranking too but older bikes tend to get rewired by some ownerthats.

Not sure on your model, but some use vacuum operated fuel petcocks...if yours has them...have you tried setting them to PRI or prime position to fill carbs without vacuum?

If the engine was seized, major engine damage was done and must be repaired first. Pistons, rings, barrells? any of the above or all.

when you say a number of years is it the same petrol in the fuel tank?

personnely i would look at the filter in the fuel tank is it clean when you turn on the petrol does it run freely? disconnect the fuel pipe and empty the tank into a fuel can

i know you said that you have cleaned the carb but did you check the floats? a messy job which will cover your hands in petrol but must be done im afraid

give me shout if when you have done this and maybe i can help some more

John