I need tuning specs for my 1982 suzuki gs 750.

COULD BE A SMALL KNOB IN MIDDLE OF CARBS, A BIT CLOSE AND TIGHT.

Have the carburetors serviced. Sounds like a fuel pump problem(if your bike has one). If not it is because the idle mix is too lean.

hi
glad i served a long time with wisco and used drag raced for them at one time
sounds to me that your ignition is to far retarded
which means the ignition will spark closer to (TDC)
top dead center
some people advanced the ignition 3 deg to stop the engine from smoking when they did away with 4 star fuel
and gave us unleaded fuel
doing this the performance is great and fast acceleration
but it also make the engine run hotter than normal
unless you have up jetted the carbs
and fitted a non standard exhaust system
the whole idea is get the fuel/air mixture in and out as fast as possible

if you still have points
take your points cover off and adjust your points baseplate
undo the three screws that hold it in place
and just move it about 3 deg towards the rear of the engine
or may be you have a electronic ignition fitted
if so do the same thing
and advance the ignition 3 deg

hope this works for you

ride safe

how long you letting it idle and not moving down the road ? its air cooled that needs movement to cool the engine ! another problem i once had was that after i polished the side casings to make it look good in a chopper style bike it overheated quicker than before , just a thought ! is yours std ? any more info you got ??

Synchronise carbs

Ride Safe
Bike-Doc

your engine will **** in an average of almost a teaspoon of dust an hour of running without a airfilter on. this dust wears out the rings in your engine and everything else it touches in your engine. Lower compression and partially clogged jets lower the vaccum that your carbs pull in. Your bike should have a vaccum operated petcock that allows the fuel into your carbs. My guess is that you have low vaccum pressure. You might just need to replace a vaccum line or a petcock. Try pulling off the vaccum line from the front of the second carb and sucking on it until you see the fuel line fill up a little (don't worry, gas doesn't go threw the vaccum line so you won't get a mouth full of gas). Once you see the line about half full of gas or better. Try starting it up without the choke (engine should already be warm). The reason why I think this might be the problem is because when you choke a engine on these carbs, you increase the vaccum in the lines. Let me know if when it is warm, before you start it, if it already has about half of the gas line filled up. Good luck and let me know how it works out.

Hi and welcome to FixYa,

Appreciate the direct "Ask Me".

Your described problem based on the bike being a 1982 model could be varied, among them are:

• weak spark - not necessarily weak battery. Culprits could be loose loose connector to the CDI, low IGN +12 to the + terminal of the coil (check with a voltmeter while just switch on and when cranking/starting), or even a loose ground terminal. Check spark by removing plugs, reconnect the plugwires, let the threaded end touch metal part of engine, crank. Sparks should be strong;
• corroded/poor contacts in the ignition switch resulting to the above. You can test by running a jumper wire straight from the battery to the + terminals of the ignition coil;
• too lean air/fuel - plugs should be brownish in color;
• air or vacuum leak - resulting to the above and high or poor idling;
• unbalanced carbs - carb check/clean, verify air adjustment screw number of turns,
  
• compression low - have a compression check.

Would look forward to your updates. Good luck and thank you for using FixYa.

it's not the timing take the carbs off and rebuild them and replace all the rubber hoses and and the rubber rings that hold the carbs on and change the plugs then check your compression

u have the mixture screw wound in to far. its normally located on the bottom of the carb. try winding it out half a turn at a time once the bike has warmed up. also turn the idle screw out a quarter of a turn at the time its in to far thats why it idles at low revs. the choke is needed to keep the air fuel mixture right thats why u are having to leave it on for so long. hope this helps.