i need help :-) - TwoWheelForum: Motorcycle and Sportbike forums
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 10-08-2007, 05:20 PM Thread Starter
 
Join Date: Jun 2006
Posts: 38
i need help :-)

hello everyone, :-)
i hope everybody is enjoying the great weather, :-)
i have a problem, maybe someone can help me out.
i bought a 1998 cbr600 f3, the bike has been sittin in the garage like 2 years before i bought. so i changed the gas in the tank, i took the carbs out, i cleaned the jets. 2 jets for each cylinder . i drained the carbs, i didnt know what else to do, i charged the battery. the floaters moved pretty freely, but jets are the only things i cleaned
now, when i try to start the bike, i open the choke all the way, the bike starts and runs around 1000 rpm. normally with all the way choke it is supposed to run higher rpm i think. if i close the choke it stalls. or if i turn the throttle , even a little bit, it stalls. so its not going more than 1000 rpm, maybe 1200-1300 when its warmer. i check the fuses, and i had an extra fuel pump and filter, i even changed those but nothing changed. is there something i was supposed to clean in the carbs more than jets?? or what is it? in my understanding, with the choke, it is starting. but in normal throttle its not. help me outtttttttttttttttt :-(
ride safe :-))
serkant3 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 10-08-2007, 05:37 PM
TWF Champion
 
SVRider's Avatar
 
Join Date: Mar 2007
Location: Fargo, ND
Posts: 3,631
Send a message via Yahoo to SVRider
Quote:
Originally Posted by serkant3 View Post
hello everyone, :-)
i hope everybody is enjoying the great weather, :-)
i have a problem, maybe someone can help me out.
i bought a 1998 cbr600 f3, the bike has been sittin in the garage like 2 years before i bought. so i changed the gas in the tank, i took the carbs out, i cleaned the jets. 2 jets for each cylinder . i drained the carbs, i didnt know what else to do, i charged the battery. the floaters moved pretty freely, but jets are the only things i cleaned
now, when i try to start the bike, i open the choke all the way, the bike starts and runs around 1000 rpm. normally with all the way choke it is supposed to run higher rpm i think. if i close the choke it stalls. or if i turn the throttle , even a little bit, it stalls. so its not going more than 1000 rpm, maybe 1200-1300 when its warmer. i check the fuses, and i had an extra fuel pump and filter, i even changed those but nothing changed. is there something i was supposed to clean in the carbs more than jets?? or what is it? in my understanding, with the choke, it is starting. but in normal throttle its not. help me outtttttttttttttttt :-(
ride safe :-))
First off... great weather my @ss...

Second... are the carbs adjusted properly??? That would be the first place to check..


Quote:
Originally Posted by drewpy View Post
they make the one i posted in a strap on version
SVRider is offline  
post #3 of 8 (permalink) Old 10-08-2007, 06:11 PM
 
Join Date: Mar 2007
Posts: 646
Great weather here!


I would check the idle knob. When you crank it choke it and idle it up some then take the choke off and adjust some more.
jnn7404 is offline  
Sponsored Links
Advertisement
 
post #4 of 8 (permalink) Old 10-08-2007, 07:34 PM
 
Join Date: Apr 2007
Posts: 41
carbs

How did you clean the jet's?
Did you move the air idler screw? If so did you count the turns and replace properly?
There are small tunnels(if you will) that the gas flows through, were those cleaned?

Sometimes when the carbs are being re-installed on the bike a float gets bumped and gets stuck. Tap the bottom of the float bowls if possible.

Carbs are not all that difficult to clean but if your going in I would go to Advanced auto and buy a gallon of carb cleaner soak most of the internals including floats, remove all o-rings they will get destroyed by the chemicals. once soaked, blow them off with air.

Good luck,

Also check for fuel filter I would replace it, and open the air box sometimes small creatures make nests in there...
RacerRobb is offline  
post #5 of 8 (permalink) Old 10-08-2007, 07:45 PM
 
Join Date: Aug 2004
Posts: 2,394
Quote:
Originally Posted by serkant3 View Post
hello everyone, :-)
...is there something i was supposed to clean in the carbs more than jets?? or what is it? in my understanding, with the choke, it is starting. but in normal throttle its not. help me outtttttttttttttttt :-(
ride safe :-))
It seems like you cleaned the jets in the float chamber (bottom) of the carbs. The idle jet, with the thickness of a human hair, is the one that usually clogs. Did you take that one out and spray carb cleaner through it, and through the passageways? Did you adjust the floats so that they are exactly parallel to the carb edge when the float tang just touches the float needle? Good, then you are halfway finished cleaning the carbs.

The other half is cleaning the top part of the carbs. On my old Suzuki, the piston and jet needle move up and down by being directly connected to the throttle cables. EPA didn't like that, so after 1980 or so, the throttle cables are connected to a throttle plate, and the piston and jet needle move up and down by engine vacuum. These are CV carbs. The plastic piston moves by small changes in vacuum, but the piston can sick in the bore if the piston and walls are not completely clean.

They can easily be checked with the engine off by lifting the piston/needle with your finger and letting go. There is a diaphram above the piston so there should be some resistance, but there is also a spring above the piston, so the piston should come down with a plastic thunk. If it stays at the top or comes down slowly, the piston and walls have to be cleaned. Several years ago I posted pictures and text on how I clean the piston and wall. Try a search.
No Worries is offline  
post #6 of 8 (permalink) Old 10-08-2007, 07:47 PM
 
Join Date: Apr 2006
Posts: 2,142
my next idea, did you change/clean the plugs in the motor? they may be fouled, and need to be changed.
King Bob is offline  
post #7 of 8 (permalink) Old 10-09-2007, 05:27 PM Thread Starter
 
Join Date: Jun 2006
Posts: 38
thanks all

thank you all for your help. i didnt' have a chance yet to touch my bike again.
i took off the jets, all 8 of them, then soak in cleaner and let them sit for a while then i cleaned with a tiny brush, yes, i checked all those tiny holes, they looked good. and vertically too.
no i didnt touch air idler. i checked all the exhaust manifolds, they were all hot, so i thought there is ignition in all the clyinders. thats why i didnt change the spark plugs yet. i feel like its a gas problem, cuz it starts with choke but throttle doesnt work at all. i will check the fuel valve, in case, some gas gummed up in there. i dont know how to adjust the floaters, they all moved freely tho. maybe i should check the little pin kinda thing under the floater?
idle knob doesnt make any difference when i play around, but i did connect it and checked if its raising
i checked the needles, they slide pretty nicely and there is vacuum, but i didnt clean the walls, felt like sliding good
so let me know what it may be :-(
thanks a lot :-)
serkant3 is offline  
post #8 of 8 (permalink) Old 10-09-2007, 05:42 PM
 
Join Date: Apr 2006
Posts: 2,142
I"d suggest going in, resetting your fuel mix screws, I think 2.5 turns out is your base setting for many carbs, so check that, while you're at it, pull your plugs and clean them just to be POSITIVE. its usually simple stuff that sets you back the most. fouled plugs may allow it to run, but not have a powerful enough spark to get it above X number of rpms.
King Bob is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TwoWheelForum: Motorcycle and Sportbike forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome