Is anyone running smaller than 126 mains?
Here is my story. I acquired an 08 Teryx with 109 hrs on it. Needless to say, it did not quite perform up to my standards. I have ordered and installed Muzzys, non-programmable CDI, Uni-filter with adapter, Dalton Clutch and HW's carb kit.
Upon the installation of all of these components, I went with HW's recommendations (for parts installed and elevation 5300 ft.) for main jets to get me started. I have read and understand the jetting process working from WOT back to idle. I installed 144 front and 146 rear. Initial WOT readings with A/F monitor were 10.3 in the front, and 9.5 in the rear. That seems extremely rich to me, so I removed those jets and installed the smallest jets that came in the kit. 136 in the front and 138 in the rear. Readings came up, just as I had expected with 11.7 in the front and 11.3 in the rear. Before I go any further, let me just say that the machine runs so much better all ready. For some, these numbers may be acceptable, but I would like to dial them in much closer. I had to order some smaller jets. Based on my math from the adjustments that were made previously, I thought that I would end up somewhere near 130 in front and 132 in the rear to get me around 12.5. I ordered jets from 126-134 just in case. While waiting for the jets to arrive, I decided that I would check the valves. I found that valves to be tight, so I adjusted them to .005 intake and .008 exhaust.
I received the new jets and decided that I would start with the smallest jets 126 that I had ordered. With 126's intalled in the front and the rear, I now have WOT A/F readings of 11.5 front and rear. These readings are taken with the stock air box and lid with HW TPI valves installed and both fully open. The machine seems to run pretty good, but I would still like to get my numbers somewhere around 12.8 or so, because I ride up in elevation from here.
Like I said, there really isn't a problem with the way the Teryx runs. Since I have an A/F monitor, I would just like to get things closer. I am not sure if other people that ride in higher elevations are experiencing similar results. I don't know if I should order smaller jets, or is there something that I may be missing. It sure seems that I might have better performance if I was running main in at least the mid 130's range or up. Any advise would be greatly appreciated. My instinct tells me to order smaller jets, install them, and trust my Air/Fuel monitor. I am really curious what might have changed in between my initial readings before I ordered the new jets, and now that the new jets are installed. I calibrated the A/F monitor before I ever used it, and thought that something might have happened between the sets of readings so I recalibrated again, but I did not have to adjust the calibration the second time.
Let me just say thanks in advance for any advice!