poor running in the older 70' kz650 is for this reason 1 cracked coils 2 points 3dirty carbs 4 vacuum leaks at intake manifold to cylinder 5 a generly abused and therefore useless machine first clean carbs then replace coils and ignition silicone intake manifolds while carbs are off tune ignition with timing light good luck my 650 a 1979 runs awsome.....keep trying....
have you thought about the coils? are you still running stock coils? i just went through my carbs and things improved drastically but the timing on 2 and 3 is not right, one is advanced and the other retarded. im replacing the coils anyway and running Dyna S when i get a chance, but it could be them...
Plug wire itself on #2 may be faulty. That would explain no-spark at the plug. Sounds like it t is not firing. That would explain coll to touch on that cylinder. Weak coil can cause this also.
i have on kz 650 to, and i have an eletrical problem that i think i have correctly found the faulty part.
i belive its the "brake light failure switch" and it mess all the eletronics.
for some miles the bike runs perfecty on 4 cilinders and can go to 12.000 rpm, but some times, that eletrical part get crazy and the bike cuts spark randomly and the bike losses torque, some times it complity cuts spark on four for some seconds.
the idle/slow jets may need to be replaced. fuel building up and draining out of the bowl could be the float sticking due to float needle sticking and may need to be replaced. I just rebuilt my 77 cb 550k cafe racer carbs--idling AND running with no bogging on main jets. initially my carbs would not idle and i replaced all the idle jets--cured that. got my idle jets at Sirius.com out of Canada.
What is the question? If you are asking how to clean the carbs, boil them in a mixture of half lemon juice/half water for 30 minutes. Rinse them and blow them dry with compressed air when done.,
Make sure that all passages are clear of crud when you're done.
check your points and condesor also check coils same thing was happening to my bike. your jets may be to large that will cause the cylinder to flood. make sure that the gap on your spark plus are set too. hopfully this is helpful good luck
that hose were u said it was driping gas that normal actually that for when ur card get flooded it poor out the gas from ur carbs nothing to worry about
Does the left side exhaust smell of gas? That will tell you a number of things. If yes, then it can be the ignition, or maybe the valves. If not, then it's probably the carb.
I would make sure the spark plugs are clean and maybe replace them if you haven't recently, and check if they all have spark. If they all do then it is the carb. My uncle had the same problem with his Suzuki 750. I think it was the first 2 cylinders weren't fireing at an idle, but as soon as you crack the throttle they would pick up. He just kept cleaning and it finally started working. I might be wrong though, so someone tell me if i am. Hope it starts running for ya!
The most likely culprit are the slow/pilot jets and float height adjustment.
mdnstr 4 months ago
The first thing your doing wrong is letting the bike run on the kick stand.These bikes should always be on the centerstand.The carbs like that
madmikeastoria 4 months ago
poor running in the older 70' kz650 is for this reason 1 cracked coils 2 points 3dirty carbs 4 vacuum leaks at intake manifold to cylinder 5 a generly abused and therefore useless machine first clean carbs then replace coils and ignition silicone intake manifolds while carbs are off tune ignition with timing light good luck my 650 a 1979 runs awsome.....keep trying....
cyclemainia51 6 months ago
have you thought about the coils? are you still running stock coils? i just went through my carbs and things improved drastically but the timing on 2 and 3 is not right, one is advanced and the other retarded. im replacing the coils anyway and running Dyna S when i get a chance, but it could be them...
Adveniotu 1 year ago
Plug wire itself on #2 may be faulty. That would explain no-spark at the plug. Sounds like it t is not firing. That would explain coll to touch on that cylinder. Weak coil can cause this also.
onlyron 1 year ago
i have on kz 650 to, and i have an eletrical problem that i think i have correctly found the faulty part.
i belive its the "brake light failure switch" and it mess all the eletronics.
for some miles the bike runs perfecty on 4 cilinders and can go to 12.000 rpm, but some times, that eletrical part get crazy and the bike cuts spark randomly and the bike losses torque, some times it complity cuts spark on four for some seconds.
tiketanke 1 year ago
the idle/slow jets may need to be replaced. fuel building up and draining out of the bowl could be the float sticking due to float needle sticking and may need to be replaced. I just rebuilt my 77 cb 550k cafe racer carbs--idling AND running with no bogging on main jets. initially my carbs would not idle and i replaced all the idle jets--cured that. got my idle jets at Sirius.com out of Canada.
vegataxkc 1 year ago
What is the question? If you are asking how to clean the carbs, boil them in a mixture of half lemon juice/half water for 30 minutes. Rinse them and blow them dry with compressed air when done.,
Make sure that all passages are clear of crud when you're done.
DannySonOfJoseph 1 year ago
here is my question i need to clean the carbs on mine it's not pulling fuel into the cylinders but it fired on cylinder 4.
matthewmarrs123 1 year ago
well if it idles fine when the chokes up n dies when its down, you need to turn the idle up
FingerLickinGravy67 1 year ago
check your points and condesor also check coils same thing was happening to my bike. your jets may be to large that will cause the cylinder to flood. make sure that the gap on your spark plus are set too. hopfully this is helpful good luck
craig9217 1 year ago
that hose were u said it was driping gas that normal actually that for when ur card get flooded it poor out the gas from ur carbs nothing to worry about
virusmakers 2 years ago
nice bike
virusmakers 2 years ago
Does the left side exhaust smell of gas? That will tell you a number of things. If yes, then it can be the ignition, or maybe the valves. If not, then it's probably the carb.
fireworkstube 2 years ago
I would make sure the spark plugs are clean and maybe replace them if you haven't recently, and check if they all have spark. If they all do then it is the carb. My uncle had the same problem with his Suzuki 750. I think it was the first 2 cylinders weren't fireing at an idle, but as soon as you crack the throttle they would pick up. He just kept cleaning and it finally started working. I might be wrong though, so someone tell me if i am. Hope it starts running for ya!
dirtbikemechanic 2 years ago
All cylinders are sparking.
DannySonOfJoseph 2 years ago
Is there spark going to the cylinders? If not check your coils.
nandoGdog 2 years ago