Coughing through carburator

[Sand Lap K-9]

What's up fellas? I have a question, running down I-20 this afternoon,6th gear 70-75mph,93 degrees, 85% humidity,dewpoint 65-70 degrees, Dog coughs back through carb. several times over about a 6-8 mile stretch. 07 K-9 2800 miles everything is still stock ( exhaust,etc.). This seems worse in hot weather but it happens sometimes in cool weather. Will this still happen once I have new pipes installed and carb has been re-jetted? Or is this weather related? thank's for any info. SL

 

[Gas Man]

yep, check your intake seals by spraying around the intake at the head with brake clean... if the idle picks up you have a intake leak. If not proceed below. I'm betting you just need to come up a size on your int. jet

http://www.bigdogbiker.com/forums/how/4943-how-adjust-your-carb-check-jetting.html

 

[Chopper Dave]

yeah....mine did that a few times last summer....found out I still had the stock jetting in....went up on the intermediate jet....no problem now..

 

[LamboV12]

Yup - lean. Just by changing the pipes would cause you to go up - at least a 31. With cams and other minor tricks I'm running a 33. I think your stock is 29.5

 

[danosrs]

Mine was doing the same , kinda would feel like it was chugging before it would cough, found no intake leak and upped int. Jet one size and no more cough and feels like a little better throttle!!

 

[Sand Lap K-9]

Sounds like it will clear up after pipes and jetting. Dan O, I know what you mean when you said motor felt like it was chugging before it coughed.Throttle response was sluggish. Sometimes when I hit the throttle when leaving a red light motor will cough then die! SL

 

[dogvet]

I've been seeing quite a few "bent" intake manifolds on pre-assembled S&S engines. It looks like somebody dropped the manifold and made a flat spot on the intake spiggot where it seals against the intake seal. If you have a recurring intake leak, check it out!:2thumbs: