Clinician
Currently Offline
Fear leads to anger. Anger leads to stress. Stress leads to doobies. And doobies lead to twinkies
Posts: 43
Likes: 1
Joined: May 15, 2010 11:29:24 GMT -6
|
Post by scooteraddict on Jun 5, 2010 15:10:46 GMT -6
It is correct that I do have a CV carb with a cylinder slide. Sorry if I didn't provide this information.
Having found out about the mod about drilling out to 1/8 inch, I have already done that.
Although it's a dilemma to make sure that we don't burn up our bikes with too little gas or flood our engines wasting gas, I would like to get it in the ball park for many more happy miles. Getting the right parts for the carb's is a PITA. Especially the Chinese bikes.
|
|
Clinician
Currently Offline
Fear leads to anger. Anger leads to stress. Stress leads to doobies. And doobies lead to twinkies
Posts: 43
Likes: 1
Joined: May 15, 2010 11:29:24 GMT -6
|
Post by scooteraddict on Jun 4, 2010 19:14:52 GMT -6
Looking further into this with research on the Internet, I have found that its best to run at target 14.7 to 1 ratio at a cruising speed and to run richer at WOT. With this in mind, I will be going back to my 118 main.
Now the funny thing is, I found out through a few carb tuning sights, a CV slide can effect the range from idle to 1/8 throttle. What would effect this range would be the notch cut into the slide. the greater the angle the leaner it would make it and the less the angle the richer it would be.
Thanks for the input all.
|
|
Clinician
Currently Offline
Fear leads to anger. Anger leads to stress. Stress leads to doobies. And doobies lead to twinkies
Posts: 43
Likes: 1
Joined: May 15, 2010 11:29:24 GMT -6
|
Post by scooteraddict on Jun 4, 2010 5:52:29 GMT -6
The orignal pilot jet was a 38 and with the needle all the was up with a washer, I would run leaner at about 1/8 throttle. The only way to get rid of the lean burn was to increase to a 40 pilot jet.
What I'm realy looking for is to get a little more fuel at WOT but going to a 118 gives me too much fuel causeing it to run rich.
|
|
Clinician
Currently Offline
Fear leads to anger. Anger leads to stress. Stress leads to doobies. And doobies lead to twinkies
Posts: 43
Likes: 1
Joined: May 15, 2010 11:29:24 GMT -6
|
Post by scooteraddict on Jun 3, 2010 18:29:37 GMT -6
Ok. I have read many different threads on carb tuning. I'm currently in the stage of trying to get my carb in the perfect range. Now you might ask yourself on how am I achieving this. Well I installed a wide band O2 sensor (for testing only) and I can see were I might be burning too much fuel and too little.
I own a 250B bike and I am running with a 40 pilot jet and a 115 main. I can tell you that with a 40, I run a little on the rich side at idle and start to lean out at about 1/8 throttle. Then I go back to running a little rich up until I hit WOT. At that point I start to run on the lean side. If I go to a 118 Main jet, then I wind up running too rich. I tried to lower the needle but back at the 1/8 throttle, I run richer then before.
Now the Question for you follow scooter riders is, what can I do to get just a little more fuel at top end without having to up the jet where I run too rich? Would changing the needle jet (not the jet needle) up would help?
|
|