Question about 1981 Suzuki GS 750 L

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I have a 1981 suzuki gs 750 engine on a quad. i finally got it running but it runs poorly. i cleaned the carbs twice and put new spark plugs in it. its running on the two cyclinders that farthest away from the points and popping through one of the other ones. and one of the points is sparking really bad. what can i do

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Is the fuel tank located above the carburetors at about the same level as the original bike? If not, you may have to install an electric fuel pump to get the pressure at the carburetors about the same as the original bike (guessing about 1-1/2 to 3 PSI). I assume that you have checked things like firing order, timing, throttle slide balance, compression, and equivalent exhaust system. Did you see and hear the engine run before you installed it into the quad chassis? Hope some of this helps!

Posted on Jul 09, 2010

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Posted on Jan 02, 2017

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1 Answer

1981 suzuki gs750. Replaced stator, wasn't charging. Charging now, but spark plug fire is real weak. Runs good at low rpms, but sputters at higher rpms.


Have you checked the points? Be sure to clean the point contacts, also she may need a new condenser if it is not new (they break down with age). Did you clean the carbs? Did you mess with any adjustment screws? post back with what things you have done.

Apr 19, 2011 | 1981 Suzuki GS 750 L

1 Answer

I have a 1981 650 gs650 motorcycle I have cleaned the carbs 3 times installed new needle and seat. air cleaner is clean. valves were checked for clearence have good fire but it is still running rich and...


The carbs have to be jetted. If they are the slightest bit out, it will backfire, burn your eyeballs from the fumes and skip and sput like crazy. I found the Dyna-Flow adjustable kits work great, the should have one for your bike, I found one on ebay, because after going to Italy (Ducati) and getting the factory setting jets put back in the bike, it still wouldn't run. I took those carbs off 20 times, the first time took me an hour, I can get them off there now in 10 minuets. Anyway, the adjustable jets work great, it fired right up and ran perfect the first time. Still running great. I am sold. Check them out.

Aug 08, 2010 | 1981 Suzuki GS 750 L

2 Answers

Continualy turning over and wont fire up, Im getting a spark off all 4 plugs carbs appear to be clean just wont fre up


squirt a bit of aerostart in the air cleaner, if that makes it run its a carby fuel problem, if that doesnt make it fire, do compression test, check valve clearance , valve timing

Apr 06, 2010 | 1981 Suzuki GS 750 L

1 Answer

I have a simular problem to (By ithacaautomo on Jun 28, 2009) with my 1982 Suzuki GS750e. Except the bike runs worse as it warms up. I've cleaned the carburators and they didn't look bad to start with....


See which plugs are running good (cream to light brown) color look at the other carbs. make sure you have no cracked rubber or flat o- rings or other vacuum leaks. You will need vacuum syncronizer or a set of good vacuum gauges to balance the carbs properly. If there is a filter it will be between the tank and the carbs. you might want to pull the valve and screen out of the gas tank, and make sure everything is clean and in good shape.
jordan

Sep 30, 2009 | 1981 Suzuki GS 750 L

1 Answer

Idles to rich


try a smaller jet.that may help

Sep 22, 2009 | 1981 Suzuki GS 750 L

1 Answer

I need tuning specs for my 1982 suzuki gs 750.


You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.

Jun 28, 2009 | 1981 Suzuki GS 750 L

1 Answer

Poor acceleration at half throttle, or engine stalls at half throttle.New battery, points, carbs cleaned by pro. Starts easily and idles.


my quad did the same....my valves(5) were way out of adjustment.I adjusted them(with a feeler gage) and now it runs pefectly

Apr 21, 2009 | 1979 Suzuki Gs 550 L

2 Answers

Which Fuel?


The owners manual says to use gas with Octane of 90.

Nov 10, 2008 | 1981 Suzuki GS 750 L

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