Question about 1981 Suzuki GS 750 L

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Have a 78 gs 750, new points, condensors, plugs, plug caps, swapped coils from another gs, and still cylinders 2 &3 are not as hot to the touch as 1&4. Compression checked at acceptable values across all 4cyl and i do indeed have spark at 2&3. Any suggestions?

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Does the 2 & 3 cylinders have any oil smear on the plugs.? please pull off all the plugs and check the performance. Check the gaps in the plugs. now since you did compression check , I would advice to have the firing of the 2 & 3 plugs with the plug attached checked.
Now correct if the gaps are down or reduce slighly if the intensity is no so good.
now start the engine and remove plug 1 , if it stall , try again with 4, now try with 2 & 3.
Check if the firing order is misplaced or there is lack of HT in the distribution.
check and comment
please rate me

Posted on Sep 02, 2010

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1 Answer

I have a random misfire in my 77 gs 750. is it possible the timing is out & if so how do I adjust it?


If it's a random misfire, I recommend looking for a high voltage problem in the ignition circuit, like a cracked spark plug, or a dirty spark plug boot, or a loose wire on the coils. Start it up in the dark and look for sparks jumping around the plug wires and coils. Point gap will affect timing, check for worn or pitted points while you're in there. Maybe a condenser is going bad.

Aug 27, 2014 | 1977 Suzuki GS 750

1 Answer

How do i test cdi


swap your coils with the cylinders that do have spark. if it changes then you have a bad coil(s). generally cant test cdi's. It's a "replace with known good part" kinda test.

Mar 21, 2014 | 1981 Suzuki GS 750 L

1 Answer

How do i wire the coils on my 78 suzuki gs 750. spark plug order which spark plug wire goes where??


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.

Feb 23, 2014 | 1979 Suzuki GS 750 E

1 Answer

I put new plugs in mygsx600f and it wont start


Obviously your no2&3 cylinders are dead.Take a new spark plug and stick it in the no2 plug cap.Touch the spark plug's tread to a bolt or nut on the engine and crank it.If you don't see spark on the spark's nose (which you most likely will), repeat procedure to no3 cylinder's spark plug cap.Both plugs are part of No 2 coil. The No1 coil feeds cylinders #1 & #4 cylinders.Find or borrow another pair, mostly all suzukis from that era, uses the same coils.If you see spark with the replacement, just means your one ignition coil is bad and you buy new oneIf you still don't see spark with the replacement coil, then the problem lies to your ECU.

Feb 07, 2012 | 1999 Suzuki GSX 600 F (Katana)

1 Answer

I pulled my plugs & discovered all 4 were bad. However #3 & #4 cyl. were fouled, esp. #3. (the rpm's did not even change when I pulled the plug wire off prior to removing plugs). #1 & #2 looked...


cfor saturn due to poor piston ring seal. Goto a chevy dealer and tell them you need the stuff to clean the rings in your saturn they should know exactly what your talkin about. You pull all 4 plugs pour that in there and let it sit for atleast 24 hours. then turn engine over with alot of rags over the spark plug holes to catch most of chemicle and let sit for a bit to dry out. Put plugs in and go. that stuff eats the carbon buildup that causes the rings to seize up. Second white plugs in that motor ar again common as it runs pretty hot. If you put plugs in it and it runs good them no need for wires. and the rumor is correct. you have plugs, wires and a coil pack then under the coil pack is the ignition module. hope that helps ya

Apr 23, 2011 | 1996 Saturn SL

1 Answer

Sat on the bike what the firing oder


I think japanese inline fours are the same -

sitting on the bike, from left to right, the cylinders are 1 to 4

one coil fires cyls 1 and 4 and the other fires cyls 2 and 3. you can swap 1 and 4 or 2 and 3, it makes no difference at all, but you can't put the 2-3 coil on cyls 1 or 4 and vice versa... you should be able to put the long spark plug wires on cyls 1 and 4 and the short ones go to cyls 2 and 3.

Dec 17, 2010 | 1977 Suzuki GS 750

1 Answer

1979 Suzuki GS750 won't start. new plugs, only getting spark with 3 at of 4. Does anyone know what might be the problem?


HI THATS ODD TO HAVE 3 SPARKING, AS THE IGNITION COILS ON THE OLD GS WERE 1COIL FOR 2 CYLINDERS IE 1&4 CYLINDERS USED 1 COIL AND 2&3 USED THE OTHER , SO IF YOU ARE GETTING A SPARK AT EITHER OF THESE THAT MEANS THE COIL IS WORKING, ON THE COIL THAT IS ONLY GIVING A SPARK AT 1 PLUG SWAP THE PLUG OVER AND SEE IF IT THEN SPARKS IN THE OTHER CAP THIS WILL ELIMINATE THE PLUG, IF THE PLUG THAT WAS SPARKING IN THE OTHER LEAD NO LONGER SPARKS IN THE OPPOSIT LEAD THEN OBSERVE THE LEAD REMOVE THE CAP AND EARTH THIS OUT WHILE YOU TURN OVER THE ENGINE, THIS WILL ELIMINATE THE CAP,

Aug 31, 2010 | 1980 Suzuki GS 750 L

1 Answer

Hi can you tell me the firing order for 87 gpx 750. Regards Paul


The firing order on your bike is 1,3,4,2. These bikes use what is called a wasted spark system. They fire whenever the piston reaches top dead centre.
That is to say they fire on top dead centre compression as well as top dead centre rock-over( exhaust/inlet ). Each coil has two leads on them.
The left coil goes to number 1 & 4 cylinders.
The right coil goes to number 2 & 3 cylinders.

The GPX 750(like most road bikes) have a resistor type spark plug cap on them that was prone to cause problems.

To test the coils/caps, use a multi-meter to test their secondary resistance.

To do this set the meter to kilo-ohms(1000 ohms), place one meter probe in one plug cap & the other probe in the other plug cap( i.e. 1&4, 2&3 )

The meter should read 10kilo-ohms to 15 kilo-ohms.

If it reads higher than that try un-screwing each cap & test the coils with the caps removed by probing the leads. If the coils(without caps)read about 5 to
10 kilo-ohms, check the caps.
The caps should read 5 kilo-ohms each.
It is very common to find these open-circuited.
Replace any open circuit caps.

I hope this has been of some help.
Otherwise if you can be a little more spacific with your problem I will try to help further.

Regards Andrew Porrelli

Jan 28, 2010 | 1987 kawasaki GPX 750 R

1 Answer

Still performance problems. ISOLATED cylinder(s)


Since you are getting sparks to all the plugs thn the problem could be tht of fuel to those two cylinders 2 & 3.
What was the condition of the spark plugs in those two cylinders? ( 2 & 3 ), were they wet or dry?
Try te following,
Swap the spark plugs form the firing cylinders and fit them to the cylinder 2 & 3.
Try to block up the air intake side of those two cylinder carburator and start the bike's engine see if they would fire, if they do fire thn theres a problem to those two carburators, fuel is not going into the combustion chamber, the problem could be float level , or the jets may need to be blown with compressed air.
Hope this helps!

Nov 21, 2009 | 1987 kawasaki ZL 1000 A1 Eliminator

3 Answers

1979 suski 750,bike runs on 2 left side cylinders, 2 right side cylinders are not firing, new plugs, plugs seem to be firing, rebuilt carbs adjusted, raw gas com coming from exhaust pipes on right side....


Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:
  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

Apr 25, 2009 | 1979 Suzuki GS 750 E

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