this is common when the carbs are out of sync with each other. Basically when you rev and then let go of the throttle the RPM drops, then hangs and drops slowly because one of the butterflies is allowing more air in, so that carburetor adds more fuel, and you have one cylinder that is more powerful than the other ones which holds the RPM of the bike up while the other cylinders pull the RPM down. You can sync them by eye or with a feeler gauge if you don't have a manometer. (part 1)..
to sync them by eye or with a feeler gauge(gauge is more accurate), take the diaphragm side of the carbs apart and pull the slides out. Hold the carbs up to a light source and look at the gaps between the butterflies, compare how much light is coming through. play with the main idle adjustor screw and the 3 little ones until almost no light coming through, it's easier if they are almost closed. when they seem the same, open them with the main idle screw to a sliver, start bike, adjust main idle
I changed the spark plug gap from 7mm to 7.5mm and now I have no more engine problems.I also turned the fuel/air screw back 1/8 turn to lean it out just a little bit and now there is no more backfire at all and I have no problems launching the bike from a dead stop.There is no more hesistation in the throttle and I probably have the full 100hp these bikes had when they were new.now it is scary fast and now I`m afraid to give it just half-throttle because it launches so hard and fast CRAZY FAST!!
Right on !! I'm proud of you for gettin' it.... I have the same exact bike and they're pretty bullet proof I'm finding out. I've had mine for 14 months and 8000 miles and I just love the hell out of it....
with a kn air filter and irridium spark plugs (and apparently a free exhaust) your carbs are set way too lean for sure with standard settings . Try to set correctly the pilot screws and needles first . And maybe your main jets are slightly too little . Every changing in air filter , plugs or exhaust needs a full carb setting to run great and safe for the life of your bike man . .
Had this problem too on thr same bike. Took out the carbs and cleaned the jets. The low idle jet was dirty and caked with crap. Cleaned the whole carbrueator and carb tuned all 4 carbs now my bike runs cherry and tightened the slack on your throttle cable and lube them. Spark plugs were gapped.at 06.
haha sick. I've taken mine to 140 and it still had plenty left. I've seen videos of these cats going to 160. I think mine can do it too just don't have the space to go that fast though. Also, I have some hesitation at low speed from my 600r too. I think in this video your carbs DID need to be adjusted, BUT keep in mind the 600r uses basically a detuned r6 motor which runs super rough at low rpm. All of them are kind of jerky and have crappy throttle response below 2k rpm.
Your cables are adjusted right so throttle plates open at same time? (static sync) All cables routed properly and not binding any where? Are cables free moving (power lube them with tri-flow spray) Throttle snapping back when released and acting right? (do this with engine off at first) The spark plug caps on right? (use some kind of boot anti seize) How did it run before you messed with it? Is it different? You just gotta reason it out. Don't assume the carbs don't need syncing, but do it last. Make sure gas is filling each float bowl and drain some out of each carb checking for H2o and etc. Everything airtight? Clamps tight? That's all I can tell ya....
Can be leaking manifold rubbers between carb and engine - if you spray WD40 on them while it's running and the engine note / revs change then this is the problem. If they leak they stop revs dying like they should, response not so good. I've done 70 000 miles on T'Cats in 3 years - trust me :-)
what a nice bike man, im glad you fixed it, im getting the same bike but the guy said it needs a starter, is that a big project? is the bike still worth it for needing a starter? any idea how much they go for?
You have two problems: 1: Idle screws need to be turned out more 2: Bike runs on 3 cylinders. Something wrong with wiring or carbs do not get enough gas.
Hey man i have kinda souns same. And it smokes from the hose that goes from engine to the airfilter. But when i give it gasit shuts off instantly it doesnt rev at all??
hi, so have you figured out the problem ? if so please share the knowledge. I had an issue like that, and in my case I re did the carb clean again and also found one rubber o ring that was bad and did clean carbs the right way second time and it was fixed but I still think it can/should be more responsive then what I have .. also as I fixed that problem I ran into another won't idle well .. so I'm just collecting all the inf O I can. thanks !
+paul chorniy just go through the normal checks, like spark plug gap, compression, fuel float height, air fuel screw turns, hopefully you dont have major vacuum leaks, if you have all the major and minor sorted make sure your bike can keep idle and get the carbs synced properly, if you don`t know how check youtube for good vids or i recommend a good motorcycle dealer or mechanic, good luck and ride safe brother!!!!!
I'm having a similar problem at around 5k RPM. My throttle also doesn't snap back, I think it just needs some lube. Also it sounds like you have a D&D exhaust? Same one I have.
hi mate your carburetor need a beter tune up whit vacuum g tool to balens the carb one by one so you can all right . just need carbs tuneing that you do not have the full power
hey can you make a tutorial video on how to change the dash lights. i have a 97 yzf600r and the yellow does suck a lot at night i want to drop some LEDs there. or if you know any links or something. Thanks
I am pretty sure problem is rised due to throttle don't shut down value of fuel so you have to replace accelator wire and oil of accelerator spring pin and adjust rpm pin !
roshunda30 u might need a lot of thing but first make sure ur fuel injection lines r putting out correct pressure and ur air filters aren't clogged make sure the plug gap is correct don't just assume their good out of the box also make sure u have proper oil and it's at correct level TEST ur fuel injectors for good flow TH-cam search fuel injector testing but the best advice I can give is get a proper repair manual try Haynes or clymer there's a lot more info in those books then I can suggest but if nothing works then please go to a licensed professional motorcycle technician
im in the same hole right now with my 600r if you get it fix upload it please!. i believe it may be the slide that the carb is mounted to it doesn't return back down as it should
i had a major wreck with my yzf600r in april 2013 i no longer have this bike but i believe that there are a few simple steps to getting your carbs setup to work properly albeit everything else like timing, compression and spark are working properly. first make sure that the carbs have been completely torn down,you do not need to separate the carbs individually,then make sure that there are no broken parts or any diaphrams that have cuts or tears in them, then you do a very thorough cleaning with carb cleaner in all the passage ways and all the little parts that are taken off, btw do each carb 1 at a time so you dont accidentally misplace any parts, then make sure that all the float needles are sealing properly,also make sure that all the float levels are at the correct distance, then check for any vacuum leaks or gas leaks, then do a simple bench sync by making all the butterfly valves the same gap at the bottom by placing an E string under the valve and tightening or loosening the sync screws so the valve give a very slight drag on the E string, do this to all the valves, anything else after this will be taken care of when u do your final running sync with the engine turned on, if i hope this has helped you out but if you need more specific information then you need to buy a proper YZF600R repair manual try HAYNES Service Manuals thats what i have for that bike & I HIGHLY recommend you watch Shane Conley videos on youtube, he is a Professional Motorcycle Technician & Instructor at WESTERN IOWA TECH he has very discriptive videos on carb cleaning and tuning also proper carb syncing technique
hanging idle is a lean symptom. just turn the pilot screws out in small increments All the same until it stops hanging then sync the carbs. or maybe one of the carbs is dirty and slightly clogged causing a slight lean condition.
this bike was only firing on three cylinders in this video..lol..gap in the sparkplug? i bet you had your coils wrong and got em right after you fixed the gap...jus sayin...
Yep the ohms reading at its closed position is 5.8 ohms! You should be able to get that number by fitting the sensor on while getting a ohms reading before tightening the screws
Your throttle body is way out of sync that’s why it decreasing slowly because it needs whatever chuck set that’s going faster the the rest to catch up to the rest
Adjust your idle it's a black turn nob on the inside of your right fairing turn it back words toward the seat about a counter turn should solve your problem
when i rev fully the rpms wont go more then 4k when i rev little it goes ! after heats up a little way better !| then when i get out the street and rev motorcycle just wont go !! farting sounds and fckin losssssssssss of power
+Pavlik Cambur you either have a vaccum leak some where or the carbs might need to be fully cleaned, if the carbs have the stock internals than its not a jet or idle jet issue, but if your, your backfiring may be from a few things, first just try taking the spark plugs out and cleaning them with a toothbrush and gas, then blow them off with compressor, then check the spark plug gap, the gap make a big deal, also make sure the float height or float level is correct, you can find this out on the Yamaha r6 forum
![[Докатились!] Обзор Yamaha YZF 600 Thundercat. Задиристый котик.](/img/n.gif)
this is common when the carbs are out of sync with each other. Basically when you rev and then let go of the throttle the RPM drops, then hangs and drops slowly because one of the butterflies is allowing more air in, so that carburetor adds more fuel, and you have one cylinder that is more powerful than the other ones which holds the RPM of the bike up while the other cylinders pull the RPM down. You can sync them by eye or with a feeler gauge if you don't have a manometer. (part 1)..
The problem is the Harley key chain in the ignition. Get rid of that, and the bike will run correctly.
most helpful answer here!
to sync them by eye or with a feeler gauge(gauge is more accurate), take the diaphragm side of the carbs apart and pull the slides out. Hold the carbs up to a light source and look at the gaps between the butterflies, compare how much light is coming through. play with the main idle adjustor screw and the 3 little ones until almost no light coming through, it's easier if they are almost closed. when they seem the same, open them with the main idle screw to a sliver, start bike, adjust main idle
I changed the spark plug gap from 7mm to 7.5mm and now I have no more engine problems.I also turned the fuel/air screw back 1/8 turn to lean it out just a little bit and now there is no more backfire at all and I have no problems launching the bike from a dead stop.There is no more hesistation in the throttle and I probably have the full 100hp these bikes had when they were new.now it is scary fast and now I`m afraid to give it just half-throttle because it launches so hard and fast CRAZY FAST!!
this so so long ago but how did you fix the hanging idle? having exact same problems
Right on !! I'm proud of you for gettin' it.... I have the same exact bike and they're pretty bullet proof I'm finding out. I've had mine for 14 months and 8000 miles and I just love the hell out of it....
@@benherzog1798 did you get ur idle fix? What was the problem
Here I am 14 years later with the same bike having the same problems 😂
Me too buddy!!!
Me too 😅
Same:(
@@NicholasWinters-c4y I fixed mine and blew up the engine since I left that comment 😂
its clearly running on 3 cylinders, therefore carbs MUST be synced
with a kn air filter and irridium spark plugs (and apparently a free exhaust) your carbs are set way too lean for sure with standard settings . Try to set correctly the pilot screws and needles first . And maybe your main jets are slightly too little . Every changing in air filter , plugs or exhaust needs a full carb setting to run great and safe for the life of your bike man . .
I have the same bike and the same problem, gonna go get a gap tool tomorrow and hope for the best. You just saved me a trip to the mechanic!
Had this problem too on thr same bike. Took out the carbs and cleaned the jets. The low idle jet was dirty and caked with crap. Cleaned the whole carbrueator and carb tuned all 4 carbs now my bike runs cherry and tightened the slack on your throttle cable and lube them. Spark plugs were gapped.at 06.
ANY time you pull the carbs it's an xlnt idea to run the sync.
Low miles or not, it needs it.
It is a mix of the carbs being out of spec and having your fuel mix screws not set right.
You got a sticky throttle position sensor
set the pilot screws at 2-1/2 or 3 turns out and it will run perfect
haha sick. I've taken mine to 140 and it still had plenty left. I've seen videos of these cats going to 160. I think mine can do it too just don't have the space to go that fast though. Also, I have some hesitation at low speed from my 600r too. I think in this video your carbs DID need to be adjusted, BUT keep in mind the 600r uses basically a detuned r6 motor which runs super rough at low rpm. All of them are kind of jerky and have crappy throttle response below 2k rpm.
MotoBoy it definitely can go over 160. Did it. Wont do it ever again.
Stock? The max mph is 148
Check your tires as well. Mine are rated at 148mph.
Throttle cable sticking? Have you tried lubricating it? See if that helps.
Your cables are adjusted right so throttle plates open at same time? (static sync) All cables routed properly and not binding any where? Are cables free moving (power lube them with tri-flow spray) Throttle snapping back when released and acting right? (do this with engine off at first) The spark plug caps on right? (use some kind of boot anti seize) How did it run before you messed with it? Is it different? You just gotta reason it out. Don't assume the carbs don't need syncing, but do it last. Make sure gas is filling each float bowl and drain some out of each carb checking for H2o and etc. Everything airtight? Clamps tight? That's all I can tell ya....
Having same problem took head off and found that it wasn't getting any oil at all
AND I tried syncing but was saying valve timing is off
its running on 3 cinder i had the same problem after changing my spark plugs i had to mess with the spark plug boots a little to fix it
Only running on 3 as stated earlier..
Can be leaking manifold rubbers between carb and engine - if you spray WD40 on them while it's running and the engine note / revs change then this is the problem. If they leak they stop revs dying like they should, response not so good. I've done 70 000 miles on T'Cats in 3 years - trust me :-)
what a nice bike man, im glad you fixed it, im getting the same bike but the guy said it needs a starter, is that a big project? is the bike still worth it for needing a starter? any idea how much they go for?
Sounds like it's only running on 3 cylinders?
Did you ever fix the problem? If so, what was the issue?
Check your owners manual page 21 - Diagnosis device. Faulty TPS is what you have.
You have two problems:
1: Idle screws need to be turned out more
2: Bike runs on 3 cylinders. Something wrong with wiring or carbs do not get enough gas.
Hey man i have kinda souns same. And it smokes from the hose that goes from engine to the airfilter. But when i give it gasit shuts off instantly it doesnt rev at all??
i heard this four times sounds like coil pack problem or h.t caps need replacing do this should run fine.hope this helps
hi, so have you figured out the problem ? if so please share the knowledge. I had an issue like that, and in my case I re did the carb clean again and also found one rubber o ring that was bad and did clean carbs the right way second time and it was fixed but I still think it can/should be more responsive then what I have .. also as I fixed that problem I ran into another won't idle well .. so I'm just collecting all the inf O I can. thanks !
+paul chorniy just go through the normal checks, like spark plug gap, compression, fuel float height, air fuel screw turns, hopefully you dont have major vacuum leaks, if you have all the major and minor sorted make sure your bike can keep idle and get the carbs synced properly, if you don`t know how check youtube for good vids or i recommend a good motorcycle dealer or mechanic, good luck and ride safe brother!!!!!
I'm having a similar problem at around 5k RPM.
My throttle also doesn't snap back, I think it just needs some lube.
Also it sounds like you have a D&D exhaust? Same one I have.
hi mate your carburetor need a beter tune up whit vacuum g tool to balens
the carb one by one so you can all right . just need carbs tuneing that you
do not have the full power
hey can you make a tutorial video on how to change the dash lights. i have a 97 yzf600r and the yellow does suck a lot at night i want to drop some LEDs there. or if you know any links or something.
Thanks
Turn the set screws 2 and 1/2 turns
I am pretty sure problem is rised due to throttle don't shut down value of fuel so you have to replace accelator wire and oil of accelerator spring pin and adjust rpm pin !
thanks im buying a 1997 suzuki katana with same problem now i no what to do
your fuel mixture is too lean, and you need to vacum sync before you adust the mixture screws.
My bike is doing the same thing gsf1200 from 98
2001 gsxr 600 won't go pass 40mph after we changed spark plugs and bad gas... what else could be the problem?
roshunda30 u might need a lot of thing but first make sure ur fuel injection lines r putting out correct pressure and ur air filters aren't clogged make sure the plug gap is correct don't just assume their good out of the box also make sure u have proper oil and it's at correct level TEST ur fuel injectors for good flow TH-cam search fuel injector testing but the best advice I can give is get a proper repair manual try Haynes or clymer there's a lot more info in those books then I can suggest but if nothing works then please go to a licensed professional motorcycle technician
im in the same hole right now with my 600r if you get it fix upload it please!. i believe it may be the slide that the carb is mounted to it doesn't return back down as it should
i had a major wreck with my yzf600r in april 2013 i no longer have this bike but i believe that there are a few simple steps to getting your carbs setup to work properly albeit everything else like timing, compression and spark are working properly. first make sure that the carbs have been completely torn down,you do not need to separate the carbs individually,then make sure that there are no broken parts or any diaphrams that have cuts or tears in them, then you do a very thorough cleaning with carb cleaner in all the passage ways and all the little parts that are taken off, btw do each carb 1 at a time so you dont accidentally misplace any parts, then make sure that all the float needles are sealing properly,also make sure that all the float levels are at the correct distance, then check for any vacuum leaks or gas leaks, then do a simple bench sync by making all the butterfly valves the same gap at the bottom by placing an E string under the valve and tightening or loosening the sync screws so the valve give a very slight drag on the E string, do this to all the valves, anything else after this will be taken care of when u do your final running sync with the engine turned on, if i hope this has helped you out but if you need more specific information then you need to buy a proper YZF600R repair manual try HAYNES Service Manuals thats what i have for that bike & I HIGHLY recommend you watch Shane Conley videos on youtube, he is a Professional Motorcycle Technician & Instructor at WESTERN IOWA TECH he has very discriptive videos on carb cleaning and tuning also proper carb syncing technique
hanging idle is a lean symptom. just turn the pilot screws out in small increments All the same until it stops hanging then sync the carbs. or maybe one of the carbs is dirty and slightly clogged causing a slight lean condition.
what do u mean by sync?
synchronize the four carbs
Exacly lean mixture
was a leak between carbs and head
you find out the problem? My bike is having a very similar problem
you need to loosen the carb screws a bit, that will fix it up.
leak between carbs and head.
Dirty Carbs ???
Maybe its spark plugs or the ignition coils
Miałem to samo
ure valves are clogged by oil shooting into valves? dismantle engine block n clean valves in kerosene..
I need sum help could someone show me a video where they fix this
Bit late here. My guess slacken throttle cable. Get it running on all 4 cylinders.
This is exactly why I take my bike to a good repair centre
Saves you a complete nightmare
More fuel..dirty pilot jet and air screw adjustment..probly likes more choke on
this bike was only firing on three cylinders in this video..lol..gap in the sparkplug? i bet you had your coils wrong and got em right after you fixed the gap...jus sayin...
Bro you know how to reset tps on this bike?
Yep the ohms reading at its closed position is 5.8 ohms! You should be able to get that number by fitting the sensor on while getting a ohms reading before tightening the screws
MAYBE A STICKY THROTTLE CABLE?
Roger Davis it could be because that motorcycle is old
So did u do 2 fix it
Ever figure it out
I have the same problem
Dude mine is doing exact same thing? did you get it fixed? what was it?
What was it
Yea just open those carbs man and see if your plugs are right
I've got a 90 fzr 600r and mine won t idle I half to keep revving it anyone know how I can fix it
If I was near ya I'd buzz over on my bike and give ya a hand Elizabeth...mine is a 2002 and I just love that little puppy...
Clean your pilot kets, problem solved!
Running lean. 25% blocked low ended nedle
Your throttle body is way out of sync that’s why it decreasing slowly because it needs whatever chuck set that’s going faster the the rest to catch up to the rest
@TheJohn10992 my 98 does 110km/h in 1st
Mine too!
Adjust your idle it's a black turn nob on the inside of your right fairing turn it back words toward the seat about a counter turn should solve your problem
firedawg8956 I had the same problem that’s wat I did n it worked
can u help me with my yamaha r6 2000?
+Pavlik Cambur what`s the problem?
when i rev fully the rpms wont go more then 4k when i rev little it goes ! after heats up a little way better !| then when i get out the street and rev motorcycle just wont go !! farting sounds and fckin losssssssssss of power
+Pavlik Cambur you either have a vaccum leak some where or the carbs might need to be fully cleaned, if the carbs have the stock internals than its not a jet or idle jet issue, but if your, your backfiring may be from a few things, first just try taking the spark plugs out and cleaning them with a toothbrush and gas, then blow them off with compressor, then check the spark plug gap, the gap make a big deal, also make sure the float height or float level is correct, you can find this out on the Yamaha r6 forum
2:40 low fuel light comes on..lol
😭
sync your carbs
how fast can this bike go in first gear
70mph
Too much air
2 rich
i think you got a damage needle! try buying a new carb.
leak between carbs and head.
leak between carbs and head.
leak between carbs and head.