carb with a cold

Energy One
B

beano

Member
I have a 02 pit (107 incher)When im driving down the road at any given speed the carb seems to cough briefly just 1 quick time each time.Also there is an oil residue on my oil can every time i ride.The coughing does not effect the bike much at all.Is this common.As far as i know the carb is stock .Doesnt smell to rich to me.I had it adjusted last summer and the guy said it had grat response(i think so too)What do yall think?
 
jwoolf

jwoolf

Well-Known Member
carb coughing is a sign that the bike is running lean. What rpms the bike coughs at will tell you where you need to start changing jets and mixture.
 
jwoolf

jwoolf

Well-Known Member
If you have a stock carb there's a screw adjustment.

I think Gas Man may have a paper on how to adjust your carb.

You can adjust the air/fuel mix and the accelerator pump both. If you can't dial it in, you'll have to change your jets and adjust again.
 
B

beano

Member
And the oil residue on my oil can?Keep in mind this is the first bike ive owned other than mx and atvs
 
G

Gas Man

Cool isn't cheap
Calendar Participant
Some sniplets

Gas Man said:
Gas Man said:
on the adjustments... will paste in a layout on how to adjust the carb
Gas Man said:
Also include S&S adjustments
S&S Shorty Carburetor Adjustments

S&S Carb Manual
http://www.sscycle.com/modules/instruction/uploads/51-1012.pdf



Gas Man said:
Exactly... if you can't adjust it with the accel pump then you need to go bigger on the int jet.

You can use the "remove your carb" thread to help get to it... look at post #1,2,7,8 to aid you in getting to your jets. No need to remove the carb... just have to drop the bowl.

To adjust the carb... with the bike warm...
(in=clockwise/out=counter)

if your idle is low... turn it up a bit...

now spin in the accel pump screw till it seats.

now spin in your fuel/air mix screw till the motor sounds like it wants to die

now spin it back out counting 1/4 turns. Do it slowly to give the motor/carb time to adjust. Do this till the motor sound like it wants to die on this end. Now you have counted those turns and you have say 2.5 turns. Spin it back in 1.25 turns. Or middle to almost dead on each end.

Now adjust your idle to 1,000 rpms on the tach.

Now spin it out 1.5 turns

Now with a few quick stabs at the throttle see if the rpms come up fast like you would think or if it kinda hesitates then takes off. If it does hesitate then spin the accel pump out another 1/4 turn and repeat till you get what sounds good.

If that don't fix the sneeze... you can spin out the accel pump a bit more... but anything over 2.5 turns means you need a larger intermiediate jet.

Click to expand...
Click to expand...
Now on the plugs... to test run the bike and see if the jets are good.

Check or replace plugs.

run the bike but keep the RPMS below 2500... then don't let it idle and kill the motor, check the plugs. That is to help check the int jet.

Then take it out and run it hard... keep the RPMs up and romp on it... then on a striaght patch of road with the RPMs up high (over 3k, or even higher) kill the motor with the OFF switch. Pull the plugs and check. that is to test the main jet.

The idea here is that your int jet runs from idle to about 2750. Then the main kicks in from there out. That's why we say your run mainly on your int jet. main is only for romps.

Use this GUIDE to read your spark plugs.
Click to expand...
Click to expand...
And I'm betting the oil residue is from the rear breather spitting.... run that shit to the ground.
 
B

beano

Member
GAS when you say run it to the ground where should it be ran to originally?I ask because someone has plugged somethig off with what appears to be silicone
 
B

beano

Member
If you look at the info sulconst2 gave me go to page 9 picture 20.The silicone plug im referring to would be located just underneith thr guys thumb.I did realize it is not the overflow hose.hope to here from you soon gas
 
pig pen

pig pen

Well-Known Member
Is it the black hose that goes from the back of the air cleaner to the rear of the crankcase?
 
Loafington

Loafington

Active Member
Has the bike always done this or did this problem just come up out of nowhere
? If this problem just started occuring, and the bike ran fine before, you may have another problem and thus jetting the bike will not be the answer. If the bike always ran this way, then yes, you MIGHT have a jetting issue.
 
jwoolf

jwoolf

Well-Known Member
Or, if you changed a breather and/or pipes and now it's running like this, you probably need to jet.
 
chacha

chacha

Chaff Your EHC!!
Calendar Participant
Beano wrote;

If you look at the info sulconst2 gave me go to page 9 picture 20.The silicone plug im referring to would be located just underneith thr guys thumb.I did realize it is not the overflow hose.hope to here from you soon gas
Click to expand...
There should be NO plug there, that is the for F'n bowl overflow tube and should have a tube running to under the bike. :bang:

You can see it in this pic. It is the small tube coming off of the carb. Mine is braided, but they are normally clear.

 
G

Gas Man

Cool isn't cheap
Calendar Participant
beano said:
GAS when you say run it to the ground where should it be ran to originally?I ask because someone has plugged somethig off with what appears to be silicone
Click to expand...
The rear breather line that goes from the rear rocker box to the back of the carb plate. You plug the backing plate and run a longer hose to the ground. Just be sure to keep the chk vlv inline with the white side facing the motor. That will stop the oil leaking from the carb/air cleaner when riding.
 
LARS

LARS

sippin & cruzin
Hey Gas,diden't you do a detailed how to on this ,I remember seeing something on the subject by someone ,anyway can't find it.I'm asking cause I too get some oil on my oil tank and on my pipes,not to much but enough to see,would like to take care of it ,thanx
 
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