workaholic
New member
- Joined
- Jan 25, 2004
- Messages
- 30
I have a Yamaha Exciter 570. I have a new DG pipe. I have the stock needles. The stock jets for the exciter is 320, i put 330's in it for my DG pipe. Tonight i installed UFO's in my carbs. It sais in the instructions that it might richen it up a bit, AND SO IT DID!! My plugs are black like crazy. I tried putting my needles to the leanest clip and still running rich and all it does it bogg. But in the UFO instructions it sais that I might need to lower the pilot jet to half (stock is 42.5). Now my question, should I just lower my main jet back to stock (320) and put my needle clips back to stock aswell. Or, get smaller pilot jets.
PS. I also tried opening my air screw more than stock (stock is 5\8 turns, i put it to 1 1\2 turns)
Thanks
Eric
PS. I also tried opening my air screw more than stock (stock is 5\8 turns, i put it to 1 1\2 turns)
Thanks
Eric
Unfortunately you will have to determine how your mixture is at each throttle position. This can be quite a long process. The UFO's do work, however they take a significant amount of tuning to get right. They do exactly what they are designed to do, and greatly reduce the air turbulence in the carb. This changes the mixture in a non-uniform manner across the throttle scope. The uneveness is not caused by the UFO, but rather greatly diminished by it. Unfortunately your sled was tuned to accomodate the uneven nature of this turbulence.
The bad news is that not very many people have gone to this amount of trouble, so good reliable information for your specific setup is hard to come by. My advice is that unless you have the time and patience to go through the entire tuning process, or the sheer luck to find someone who has your exact setup, go without them.
On the other hand if you do make the effort to tune the whole throttle spectrum, you should be pleased with the results.
The bad news is that not very many people have gone to this amount of trouble, so good reliable information for your specific setup is hard to come by. My advice is that unless you have the time and patience to go through the entire tuning process, or the sheer luck to find someone who has your exact setup, go without them.
On the other hand if you do make the effort to tune the whole throttle spectrum, you should be pleased with the results.
workaholic
New member
- Joined
- Jan 25, 2004
- Messages
- 30
what if i were to buy an ETG, the one i am looking at has 2 probes but i would only need one, can i still use only one? or do i have to buy a single probe kit. Also, how exactly do those things work? how do i read and use it
I feel that you should use plug color, and piston wash firstmost, and the EGT's (if you have them) after that to fine tune with. If you only use one EGT probe then the benefit is lessened because you are getting an average between both cylinders, and have more potential for skewed results due to increased turbulence.
Phazer
New member
workaholic said:
Don't quote me on this, but if you put only one probe in, it would be after the two pipes come together. This might be too far away from the cylinder. I think the EGT probes have to be within "X" amount of distance from the port to get an acurate reading.
If you put the egt in, use both probes, and put them in the y-pipe. Your still going to have to use plug color and wash to get an idea what the numbers one the gauge are telling you. example: on motor A 1200 might be perfect, while motor X will show 1325 as being right on. Motor A would likely stick a piston at motor X's ideal temp.