[streetfightzxr750]

Ok, i just had the same problem happen to me today. Let me give you a run down.

The first problem was when my engine was running and i reved it i would rev up and then only return to 4k , and would sit there forever and never come back down unless i adjust the idle screw down and then i get it back to 1300-1500 and it will start to die. When it does idle at 1500 and i rev it again it will do the same thing rev up and go to 4k. and i have to repeat the same process.

Well i had it fixed, i took the carbs off cleaned them and remounted them and had not problems. I took it out for a ride today and wheni came home i noticed it was trying to stall. So i came in and got a drink, and then went back out to start it and bam it was hard to start but after i started it i reved it, it only returned to 4k and im back to where i was a week ago. just filled the tank full of fuel and seafoam to help clean anything out of the carb that might still be there. I took the tank back off and sprayed carb cleaner around the boots and got no surge.

i am at my wits end and i have NO idea what else to check.

PLEASE HELP ME!!!

 

[allendoc]

Ok, i just had the same problem happen to me today. Let me give you a run down.

The first problem was when my engine was running and i reved it i would rev up and then only return to 4k , and would sit there forever and never come back down unless i adjust the idle screw down and then i get it back to 1300-1500 and it will start to die. When it does idle at 1500 and i rev it again it will do the same thing rev up and go to 4k. and i have to repeat the same process.

Well i had it fixed, i took the carbs off cleaned them and remounted them and had not problems. I took it out for a ride today and wheni came home i noticed it was trying to stall. So i came in and got a drink, and then went back out to start it and bam it was hard to start but after i started it i reved it, it only returned to 4k and im back to where i was a week ago. just filled the tank full of fuel and seafoam to help clean anything out of the carb that might still be there. I took the tank back off and sprayed carb cleaner around the boots and got no surge.

i am at my wits end and i have NO idea what else to check.

PLEASE HELP ME!!!

After cleaning the carbs, it fixed, and your carbs were junk if I remember reading correctly. SO the gunk is coming from some where, change the fuel filter, clean the tank out, and you are going to have to clean the Carbs again. I fought the same thing for almost a year. I had to clean every aspect of the fuel system, change plugs to iridium, and finally after a complete economy carb rebuild, a carb sync, and now I have never been happier.

 

[streetfightzxr750]

so i took the carbs off again to clean them again. Well after i pulled them off i found that there is a plug instead of a vacuum adapter to hook a hose up to. Is this suppose to be like this?? are all four suppose to be hooked up to the vacuum lines??

 

[airgreesemonkey]

your going to need some more info, which vacuum line?? there are several. if you have done a clean air mod then youve removed most of the emissions components and blocked off the vacuum lines coming from the intakes on the cylinder head. there are also some lines on the top end of the carbs that connect to a valve that controls the air pressure in the carbs which can also effect the mixture. based on your claim that the rpm is rising to 4k before settling out to normal, you are definately running lean. the question is what is causing it

 

[christikitty]

Check your fuel lines. I had an F2 that would do the same thing and it turned out that the fuels lines collapsed inside and was letting chunks of crap get into the carbs.

 

[streetfightzxr750]

yes the i have already deleted all the emmision stuff ont he top and just connected the lower hoses under the carbs to each other. the upper float bowl vent tube at the top of the carbs i have hooked into the air box.

Now i finish cleaning them and putting the carbs back on and putting another NEW fuel filter on and the fuel is clean coming in. i still cant get it to start right

i try choke on and off, with choke off and no throttle it gives a sputter like its trying to start but doesnt, then the choke on it doesnt try at all. If i try throttle with the choke off it doesnt sputter just cranks like its getting to much fuel, but if i work it with very little throttle i can get it to start up and with some work i can get it to idle.

ANY HELP WOULD BE APPRECIATED!! this is my first bike and my dream bike i have wanted for years and now i am just so down i want to get rid of it and never own one again. i do like it and when it starts to run right it seems fine its just this weird shit.

battery new, fuel filter new, fuel pump new, new fuel hoses, fresh oil change, new plugs

 

[airgreesemonkey]

what are your float settings and pilot screws set at?

 

[streetfightzxr750]

17 mm is the floats and the pilot screws are 2.5 turns out.

 

[christikitty]

Bring your floats to 15mm Should clear ya out.

 

[fame28]

I had alot of this same type of problem for a very very long time. I found out that my intake manifold boots had cracks in them and they needed to be repaired or replaced. I was ALWAYS fiddling with the idle adjustment screw to keep it sort of idling and eventually I just learned to never take my hand of the throttle at a light with it revving at 1,800 rpms. Start the bike and ask someone to hold the throttle to keep it running at an even rpm, take a can of Carb starting fluid and just lightly spray around each boot and all of your vacuum lines. If there is a leak the bike will surge the rpms upward. Always start with the simple stuff like this first.

(If it is a crack and you need a temporary solution there is a product sold at local auto stores called "Seal All". It works amazing and it dries clear and its gas resistant.)

 

[sixstring]

so i took the carbs off again to clean them again. Well after i pulled them off i found that there is a plug instead of a vacuum adapter to hook a hose up to. Is this suppose to be like this?? are all four suppose to be hooked up to the vacuum lines??

There are 3 vacuum adapters. Cylinder #2 is plugged. I have no idea why but this is how the bike comes from the factory. You'll need to buy an adapter and crush washer from Kawasaki if you want to balance your carbs.

 

[streetfightzxr750]

i pulled the boots and they look ok. i i sprayed some carb cleaner around them off and moved the rubber around but didnt see any cracks or holes. I am completly clueless right now. i put it all back together and i still have the high rpms, and i think i have another problem forming. Cylinder 3 was smoking after i shut it off. i did some checking and found 3 wasnt sparking or had a weak spark. so i took the parts off and tested and it all ohms to the correct specs. so like i said i am so stumped here. i have never had problems with cars like i am with this bike.

i have checked everything and i still get a surge in the engine when i spray carb cleaner around them it take a while but it will surge. i have tighten the clamps to the carb all to the point i can no longer tighten.

 

[Masta Squidge]

Are you sure your pilots are not set too lean?

Mine are right now, and if I try and turn the idle up to where it should be it hangs like a bastard. Right now my bike is idling lean and at about 800 RPM lol Need to turn dem pilots back out.

 

[streetfightzxr750]

i am not sure what the hell is going on. I pulled the plugs and 1 2 4 are all tan and look fine, but 3 is soaking wet. checked for spark, not getting it. ohm out coil and it checks out. changed the plug with a different one and its fine. I am not sure but i am taking a break. i just feel like it is not getting any better.

 

[fame28]

The delayed surging is because you have crack on the intake boots or on a vacuum line. Just because you can't see a crack does not mean there isnt any cracks. I found that mine had almost invisible cracks around the intake carbureutor sync lines. If its surging after you spray starting fluid on the intake boots, then there is a reason for it... It was 2 years until I figured out the true problem. Good luck though.

 

[streetfightzxr750]

ty fame for the info. i will pull the boots and put some of the stop leak around it to see if it makes it better. If it does and fixes it then i am going order new boots. i did also change the lower vaccum hoses with new ones and a new t connector. all i did was hook the three vacuum lines under the carb to each other. there is a plug on cylinder 3.

 

[allendoc]

I still think there is some loose debris that got past the old fuel filter. Just check to see if you can see threw all 4 pilot jets, the ones down in the hole. If you can not, that would explain a lot, run a strand of wire threw them, I even soaked over night with the strand of wire in the pilot.... They control the idle circuit.

We all know it only takes three things for a motor to run, Air, Fuel, Spark. You know she is getting air, maybe too much (if you have a vacuum leak).... Now the question, is the problem electrical or fuel... So, will she start if you spray Starting fluid down the Carb? If she does, it is fueling issue. If she doesn't, it could be a spark issue. You keep saying 3 is wet. Is three firing? I had to replace my wires because number 3 would not stay down on the plug... I would push her down, feel the click, click, click, and If I let off pressure, I would feel the reverse click click click....

I had to rebuild my carbs four times... The last time, I had 4 economy rebuild kits, took the 4 carbs apart from each other, and soak each carb in it's own container for two days. Each pilot jet was soaked (with a strand of wire inside), and I soaked the part that the Main Jets go into with strands of wires through the sides (the 3 vertical hole on each of the 4 sides). And I took compressed air to each carb, I can tell you where each tube goes.

I wish you all the luck brother, but when you finally nail it, you will have such an appreciation for your bike, and will make understand the why.

 

[streetfightzxr750]

i know i think its something very simple and i just need to start ALL over and work my way forward and take no shortcuts.

Once fixed trust me i will love it.

 

[Masta Squidge]

If you have the idle adjuster out too far it will never start. Try screwing with that while cranking. Found that out with mine. Crank and crank and crank, then turn that back in and it starts fine.

 

[streetfightzxr750]

so took the carbs off last night and tore them all apart again. Now the only thing i have not done yet is pull the float valve seat out. I have removed the screws that hold it but i can not get them to come out. THey are stuck, any suggetions. I called a couple of places today and they ALL said my bike is to old to work on. So now i have two problems my bike is not running right and even if i wanted to pay someone no one local does it.