I wanted to get some feedback regarding vm20 idle circuit tuning.
I have an e50 vm20 (190 main jet with 22.5 idle jet) with malossi reed and estoril.
The bike has always been a pain to start. I added the vm20 about 4 months ago.
I put the carb on the bike as shipped from Treats. With the choke on, I would kick the bike over several times (~10) with no avail. After a few second break, I would go back to kicking the bike over (~10 times) and give the bike full throttle and it would start. The bike would want to die unless I was giving it some throttle until the temperature reaches 225 degrees, then it runs fine.
I recently moved to Phoenix with garage temps around 100 degrees. I have been looking into the following guides and talking to some gurus and I am still lost -
The bike idle temp is around 260. From the above information, it seems that the mixture screw is to be 1.5 to 2 turns from being bottomed out to start the tuning process. What position do you put the idle screw when you start the tuning process and when do you change this? Choke or no choke?
Trying to understand the Mikuni manual, I found the bike wants to "stumble" when the mixture screw is 1 turn from bottomed out but never could get the bike to "stumble" when backing the screw out. At 3 turns out, the bike will reach an elevated RPM that does not change with continued backing out. I feel as if a minor adjustment to the idle screw can throw all the mixture screw adjustments off.
Sorry for the confusion. I am a newbie.