Part# 23 on yamaha carb diagram
Posted June 10, 2010 - 12:27 PM
I am looking at mine and it is a "72"
Posted June 10, 2010 - 12:42 PM
The small brass jet is #21 the starter jet. It is used when the choke (really an enricher) is used. Normal sizes are a 68 and 72, most of the time.
#23 is the main jet, installed in the end of the needle jet emulsion tube. Sort of sized in 3's - 170, 172, 175, 178, 180.......
Posted June 10, 2010 - 01:16 PM
needle-jd red with clip from top
starter-stock (i have 72 but its almost 100degrees here, I dont think I need it?)
Twin Air filter
Let me know what you think before I button this carb back up. I have a 160 165 and 168 and a 170 available for the main.
Posted June 10, 2010 - 01:46 PM
Some of the popping is from your open pipe. A stocker or a WR muffler would reduce it somewhat. A WR carb too, would reduce it (it has a ACV). Make sure you do not have any exhaust leaks (used a new gasket in the head when you put the pipe on?)
You could run a smaller starter jet in the summer but to be honest, I would only swap it out if cold starts got harder to do as the temp rises and I doubt they will. My WR came with a #68 and cold starts were problematic. I put in a 72 and that cured it.
Posted June 10, 2010 - 01:50 PM
popping when on or off the throttle? what throttle position?
45 pilot? seems excessive. try #40. do you know how to tune pilot circuit?
I liked 168 on the main, you might be good with the 165.
try that needle 3rd or 4th clip from top first.
Posted June 10, 2010 - 02:56 PM
Edited by Mrmonk7663, June 10, 2010 - 03:53 PM.