I currently have a 2001 Yamaha Raptor. I've had a lot of problems with it in the carburator. I had some work done on it. Now I've noticed that everytime i go up any sort of incline, wheather it is a steady incline or a fast one, black smoke shoots out of the exaust and it bogs down. It will normally die once i hit the top of the incline. I was told that it's probably because of the floaters in the bottom of the carburator, because the engine isn't getting enough air, just fuel. If i take off the bowls on the bottom which way would the floaters need to be moved?? Or is there some other problem i'm not seeing?

 

Changing the fuel level will lean the entire range of the carb, pilot, needle and main.
Sounds to me like a jetting problem. How often do you clean your air filter??
To lower the fuel level in the carb the floats(with the carb upright) have to be adjusted downward. There is a small metal tab on the floats that pushes the float needle closed when the float bowl is full. This tab would have to be bent upward or in the direction of the float needle.

 

It's your float level. Do a search on "float" you'll find a ton of good info.

 

I thought it was a jetting problem at first too. I bought the quad used. It had already been piped and a K&N filter. When i had the carb worked on they said it was already jetted. I can take it down to the dunes at a lower altitude and it runs great, except going up and incline. Same thing up in the mountains. I didn't know until just the other day that cleaning out the air filter was such a big deal. I had cleaned it out about 3 weeks ago with the K&N recharger kit. But I didn't clean the outer bag. Today I just cleaned everything including the air box. Will that make that big of a difference?? The bag was really dirty and the top of the filter was pretty clogged.

 

Would adjusting the screws any help, instead of taking the carb. apart to adjust the floats??

 

How many hours do you have on your motor, if its smoking you might need to re-ring it.

 

IT'S YOUR FLOAT LEVEL!!! No screw turning or jetting is going to correct the problem.

This is the best way.

The best thing to do is check it before you take it apart, with a piece of clear tubing. You can get the tubing at a hardware store for 20 cents, 1/8" clear tubing.

Thu September 05, 2002 3:11 AM



The quick & easy way to check float levels is to use a clear tube that fits the dump hole on the bottom of the carbs. You'll need at least one foot of tubing. Don't worry about an exact fit, the tubing can be a little bigger which will cause some of the gas to leak out but gravity is forgiving and is constant! You can get the tubing from your Yamaha dealer for a few bucks. Remove the stock dump hole tubing, put the new tubing on there & then bend up the other end and run it along side of the carb with the open end facing up. Then open the drain screw next to where the tube is connected & the level of gas in the tube should fill up & be level with or slightly above (1/8") the bottom/top half of the carb's mating surface. If not, you'll need to adjust the float levels. A sign that the float levels are too high is if the stock drain tubes leak gas while your riding, you'll smell it for sure.
I just pop the carbs on the boots and set the tank on the frame and hook up the hose to check it again, you may have to take it back off once or twice to get it perfect. I also measure the amount that it is off and then take it apart, measure the float height and then bend the tab enough to raise or lower the float the amount that it was off. If that makes any sense.

 

Believe me it is the float level, Sixsixt's method works great. What happened to the paypal???

 

I'm taking names.[img]i/expressions/face-icon-small-smile.gif[/img]

 

Okay, I just tried all of that and when i open up the stop screws fuel just leaks out into the tube. It doesn't stop. I have the fuel turned off and the quad is on level ground. What should I do?