Question about 1985 Suzuki GS 700 ES
Getting the pilot jets cleaned out is the big trick. If it will not idle, the pilot jet is problem.
The carbs not adjusted properly
Synchronizing and balancing the carbs will be a nightmare. I would make a diagram of what hoses attach where and mark each hose. If you remove any adjusting screws or jets, write down the number of turns it takes for removal and than put each one back the same number of turns. Before removing the carbs, drain them (assuming there is anything in them). Now get a spray can of Berrymans carbcleaner (or another brand), and fill the float bowls full of cleaner by disconnecting the fuel lines and spraying into each fuel line until the level in the line is reaching the top of the float bowl. Now wait for a couple of days while the cleaner softens the dried varnish residue in the carbs. Now remove the carbsas a set then dis-assemble and clean with a couple more cans of cleaner.
turning the idle screw won't get you to where you want to be. Those carbs are very touchy and need to be balanced but first the valve clearances need to be verified. For idle adjustment screw check fig:--
Adjust cylinder #3 to best idle. You may have to remove the covers over the idle screws. Drill each carefully with a small diameter bit, and extract by turning a screw a few turns into the hole you bored, and pop it out with a tug on the screw with a pair of pliers.
To ensure that the idle mixture was correct, you can use Colourtune, a sparkplug . You can see the colour of the combustion flame as the plug fires. When you see a bunsen blue flame, the idle is correctly adjusted. If you could not get a blue flame. Then the jets needs to be checked as well. The moral is that tuning by ear gets the best idle, but not necessarily the correct idle.
Once the idle mixture is correct, set the idle speed to high RPM using the adjustment knob located between the airbox and the carburetors. Cylinder #3 should draw about 10 in Hg (24.5 cm Hg). This is your baseline measure. If the motor is not drawing this vacuum, double check that the idle RPM and mixture are correct; a rich cylinder will not create the full vacuum.
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Posted on Aug 04, 2010
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Posted on Jan 02, 2017
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