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I didn't want to edit my post a second time but I thought of something else with my other edit. If you look at UKWeasel's sig it says he is 2 turns out, with the factory setting of 2 1/4 turns out you see that he went in 1/4 turn since his mods, which include a larger pilot jet.
I have to agree with the info you've presented. That's why I was asking if it was a rich or lean problem. My problem was a lean problem, so I went up on my pilot and fine tuned the a/f screw all at the same time to eliminate my problem. If your quad is running too rich and you shim it will definitely make it richer and intensify the symptoms.
Ok, i'll leave teh needle alone and then i'll turn the af screw in 1/4 turn. I have a 40 pilot.
I noticed that the falling on it's face sympton happens much more during cold weather. It's 50 today and it's not falling on it's face. Would this also mean that during cold weather i'm a little rich and i need to turn the af screw in a bit?
Colder weather will make you run leaner than warmer weather. The theory is that colder air is more dense, so you have more oxygen packed in the same volume vs. warmer air, which means you need more fuel in order to make it run at the same air/fuel ratio. Since a carburetor works based on air flow, not necessarily temperature, the adjustments have to be made via jet changes and/or adjusting the af screw.
Basically I would just use the powers of deduction on your machine. Turning the screw out has netted little to no results, so try turning it in to see if that helps at all.
On a side note, in a similar thread the OP is having a problem that the quad wants to bog and die if the throttle is pinned so the suggestion was to move the clip on the needle from the third to the second position essentially leaning it out a bit.
ok now i'm confused. I'm gonna get into the quad tomorrow and see if turning the a/f screw in works. But the 4 wheeler starts hard and pops and it still falls on it's face when i do the steady throttle thing so it feels like it is in fact running lean and needs more fuel. Maybe i need to try turning the a/f screw out about a half turn or more to see if that helps.
With a 40 pilot about how far out does it need to be? It's at the stock setting right now which is 2 1/2 i believe.
I can't seem to figure this out, help please!!!
I have gone in both directions with the a/f screw. it seems to run best right around 2 1/2 turns out but it will still fall on it's face.
Is my problem the needle or what? I've been in to the carburetor like 5 times and i'm about to take it in to the shop and have them get it in tuen.
This is driving me nuts!!!!
152, 2nd clip position on needle, 40 pilot, 2.5 turns out on the f/a would be my starting point for it if it stumbles. what do you have done now anyway? last i knew you were going to take your lid off and a bunch of other stuff. with your lid off and a new filter i would go with a 155 and the rest the same. steve
If it does better in warmer weather its getting better as its becoming richer. if you aren't getting much response from a/f screw, and you are running a 40 pilot...in that throttle range, i would say the only thing left is your needle setting...which from the sound of things needs to be adjusted upwards a clip position. but 05 and ups don't have adjustable needles, so you will need to shim it or purchase one.
have you guys ever heard of over oiling the air filter? I was told to put the air filter ina bag and let the oil get all over it.
I'm going to clean and lightly oil the stock air filter and then put it in. That way i should be able to get it in tune.
The 152 main is just fine. All i have is a slip on and uni, which i'm replacing with a stocker.
make sure you use air filter oil so it works correctly. you can put too much on them too. it then sucks it through and burns it. it could def make it run crappy. i just dribble oil on them around the outside then squeeze them to get the oil spread throughout. steve