20 pilots are fine 3 to 3.5 on the screws.don't know about nylon washers. you can get info on washers if you read the jetting section. scroll down a ways to a chart it will have how to jet for pods and slipon exhaust or full exhaust. there is a lot of info
Thanks for the reply. I was using that as a guide to set up my bike. I went back and looked at the image of the shim for the needles and it shows just two metal washers. I guess I got confused because I looked at the chart and it said 2 and then .5mm which for some reason I took to mean two .5mm shims and figured 1mm total.
Anyway I took out the nylon washer and put two metal washers in as shown on the needles. I left the PMS screw at 2.25 turns because it was my understanding the having the larger 20 pilot and 147.5 mains would generally richen my mixture through all but the very bottom of the throttle position.
After test driving my bike I find I am wrong. There seems to be a lean spot from about 50%-75% throttle. When the bike warms up good it is not as pronounced but it is still there, you can just feel an area that feels and sound flat. If I play back and forth in that throttle range I can get the bike to kind of stumble while it is still warming up.
What a pain in the arse.
Looks like I will be setting the PMS to 2.5 and see if it goes away, if it doesn't then keep going 1/4 turn at a time. The good news is that I am getting a good feel for how the jets, needle, and PMS effect the throttle. So if I don't get decent MPG with the PMS set right in this configuration I can drop the Pilot back to the original 17.5 and start the process over.
What gets me is the crappy mileage these bikes get. If I had a 700lb car with a 1.1 liter motor in it I would expect 50 mpg and it would have much more drag and ground resistance. It just seems like these bikes should be getting 60 MPG but they don't and I really think wanting to make it 200 miles on 4.5 gallon tank shouldn't be asking too much from these motors as they seem to plug along at 60 MPH right in their torque band.
Oh well, I enjoy dinking with it and trying to reach 50 MPG.
I was hoping someone that has already taken on this quest would chime in and tell me what they did.