questions about my kz

i've been working on my 81 kz550 little by little over the summer and finally got it running.

well cyl 3 occasionally fires(exhaust on cyl 1, 2, and 4 are hot while 3 is room temp).

when i turn the choke off the bike revs up to 5500 rpms(doesnt matter if its warm or cold)

and either way if i move the throttle it'll die.

since i bought it i've put an igniter on it, new oil and filter, new air box(i destroyed the original one by accident), new inline fuel filter, permanent choke flaps, fixed an electrical issue that cause the headlight to go out randomly.

thank you in advance.

Check the #3 spark plug to see if it's wet w fuel & Redo the spark plug wire connections.

Check the coils for cracks or damage. There are resistance checks outlined in the manual, but a coil can still be bad, especially under load. The stock coils are old, so they may need replacing.

Be sure to clean, lubricate, & check the timing advancer. It's probably not the problem, but doing so is part of a normal tuneup.

i had previously installed new spark plug wires and found out the p.o. switched cyl3 and 4 which is how i got the bike running in the first place.

is the timing advancer under the cover on the right side of the engine near the bottom? if so then i did because it seized.

and yes cyl 1, 2, and 4 are hot while cyl 3 is only slightly warm

good point about the coils. sadly i dont have meter so i cant check resistance or ohms, but i think i might just replace the coils considering the bike sat outside for 9months till i got a hold of it

the funny thing is the bike starts up a lot easier now than it did back before it quit running.

Whatis happening with the spak plug on #3. Wet dry and color. Try this next time you run it, swap #3 plug for another and see if problem continues on 3 or moves to another cyclinder.

Classic symptoms of dirty and clogged carbs. The internal passeways inside the carb bodies get clogged up when the carbs are left with gas in them for long periods of time.

81olykz440 wrote: Whatis happening with the spak plug on #3. Wet dry and color. Try this next time you run it, swap #3 plug for another and see if problem continues on 3 or moves to another cyclinder.

its clean. like i just pulled it out of the box to install. and yes it stays with the cylinder.

baldy110 wrote: Classic symptoms of dirty and clogged carbs. The internal passeways inside the carb bodies get clogged up when the carbs are left with gas in them for long periods of time.

that was the first thing i did when i got the bike but i wonder if the float is sticking.

i soaked the carbs in cleaner then blew the passages out with the compressor .

i wont have time to look at the bike till the weekend though. still trying to figure out why the brake pedal on my truck doesnt have pressure anymore.