two cylinders not firing WHY? please help

Ok so I have a lot of kawasaki z1 bikes and suzuki gs1000 they all use similar carbs. I can usualy solve all my carb problems but I can never solve this problem. Here it goes the problem, when I start the bike on choke it starts just fine but if I try to role on the throttle while it is on choke it stalls and dies, but once it warms up after 3 minutes I can take it of the choke and the bike idles semi decent and I can roll on the throttle and the engine will accelerate with some back fire going on but you can tell its not running well. When I feel the two exhaust pipes in the center they don't get hot only the two outside exhaust pipes get hot. I have had this problem on a few bikes now and I can't ever solve the probem; how do I fix this problem. PS.I have cleaned the cars with ultra sonic cleaner and changed all the part out for new. So what else can I check or do. Please help.

are you getting fire on cylinder 2/3 ?

What year/model of bike?

Can you do some checks using a multimeter? The sparkplug caps will unscrew from the sparkplug wires, they should test at 5000 ohms. Replacements can be found at www.z1enterprises.com

To set the multmeter up, turn the selector switch to ohms(it looks like a horseshoe)with the range of 20K. Put one probe inside the cap where it goes onto the sparkplug and the other probe on the threaded spike that screws into the sparkplug wire.If they check out good, cut if possible about 1/4" off the plug wires and re-install the caps.

Do you have points or electronic ignition? stock ignition coils? Tried with new sparkplugs?

pull the plug wire off of 2 or 3 and shove a screw driver in there and check for fire

Jetting the same? Balance the carbs recently? Swap coils to see if the problems follows. Hows your valve adjustment? CV carbs? Holes in the diaphram? I'm sure you will get some more advice..What model bike and carb size and model? Even new parts can be bad.

Ok, so I just checked and it seams that the coil that feeds the two center cylinders is not firing, I'm not sure the number of the cylinders but they are the two center cylinders feed by one coil. The problem is that the bike has a dyna electronic iginition instead of the old points system, and the coil accel coils along with accel 8mm plug wires. And one of the caps for the spark plugs just snaped when I tryed to take it out so now I'm not sure how to put the accel 8mm wire back on to the cap, there is some kind of weird wire in the center of the spark plug wires but its not really a wire its more like some carbon coating with fine strands of strings inside of the carbon looking coating its not a regular brass wire on the inside, how do I conect this back up to the plug, and how can I test the coils, man I'm all confuesed on this bike because nothing is original when it comes to the electrics. Help???

Ignition Coil Primary And Secondary Wiring

Ignition coils on the 80’s Kz1000,Kz1100’s and Gpz1100’s are wired the same, that is as you sit on the bike, the LEFT ignition coil primary(small wires) are two wires, RED and BLACK. The secondary (or sparkplug wires) go to #1 and #4 sparkplugs(your primary wiring may be different). The 550’s,650’s & 750’s are backwards to what is listed for the bigger 4’s.

The cylinders are numbered left to right as you sit on the seat; #1,#2,#3, and #4.

For the RIGHT ignition coil, the primary wires, again are two wires, RED and GREEN, with the secondary going to #2 and #3.

The RED wire gets it’s voltage from the run/stop switch on the right handlebar switch pod. Your primary wiring may have a different color.

The BLACK and GREEN wires connect to the IC Igniter(if the bike has the Kawasaki supplied electronic ignition) it actually gives the coils their grounds to fire the sparkplugs.

Primary(small wires) side of the coils will read between 1.8 to 3.0 ohms.

Secondary(sparkplug wire ports)side of the coil will read between 10.4K to 15.6K ohms. These ports are wired together, so it makes no difference which is used, as long as the correct coil to sparkplug configuration is followed.

The sparkplug caps should read 5K OHMS(5000 ohms), any higher, or a reading of infinity means new caps should be ordered.

To stress the ignition coils, take a hair dryer, heat the coils and see if the ohm readings change from cold to hot . If they do, it’s time to buy new coils.

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Keep in mind, the wiring is reversed for the 550’s 650‘s and 750‘s, that is the RIGHT coil primary will be two wires, RED and BLACK with the secondary(sparkplugs) going to #1 and #4.

The LEFT coils primary wiring would be again two wires, RED and GREEN, with the secondary(sparkplugs) going to #2 and #3.

These engines have what is known as a “Wasted Spark” that is, a sparkplug will fire during an exhaust stroke. It does no damage and many other motorcycle engines have this design.

00. wrote: Ok, so I just checked and it seams that the coil that feeds the two center cylinders is not firing, I'm not sure the number of the cylinders but they are the two center cylinders feed by one coil. The problem is that the bike has a dyna electronic iginition instead of the old points system, and the coil accel coils along with accel 8mm plug wires. And one of the caps for the spark plugs just snaped when I tryed to take it out so now I'm not sure how to put the accel 8mm wire back on to the cap, there is some kind of weird wire in the center of the spark plug wires but its not really a wire its more like some carbon coating with fine strands of strings inside of the carbon looking coating its not a regular brass wire on the inside, how do I conect this back up to the plug, and how can I test the coils, man I'm all confuesed on this bike because nothing is original when it comes to the electrics. Help???

Would first consider replacing the plug wires with Dyna solid metal core items from Z1E, which already have the caps pre-fitted onto the wires.

Click here > www.z1enterprises.com/SearchResult.aspx?...eyWords=plug%20wires

8mm is imo overkill, unless they readily fit (without trimming) into the coils. The stock 7mm size is plenty thick.

Leave the new plug wires extra long in case the coil is replaced with a different brand requiring a longer plug wire.

Good Fortune!