It is a terminology issue between us. If you call that 3rd needle what do you call the mid range needle in OS55HZ and the 90 engines ? The RL53 needle you are referring to sits opposite the low end needle. It provides a way to move the fuel injection point in the carb airflow (let's not consider the migration problem now, that is a separate issue). What effect this has is beyond my understanding. I don't know how this can be used to tune the midrange vs idle. Sounds like you fiddled with it and found some difference. Will be interested in knowing if you reached any understanding.
Hi,
Thanx to Anwar and Second_ chance....Its coz of dem that i have been able to tune my RL53 engine...(Anwar bhai had asked me to post my experience with Rl53 in this topic...)
First tank: Main needle at 3 turnd and mix valve flush with carb... Temp at base plate: cant even keep finger for a second...Fuel: 15% tornado heli fuel
2nd tank: main needle 4 turns out and mix valve flush..Temp at base plate: too hot to touch....So, i panicked.. Packed up my stuff n went hom..
Did some research and changed all the clunk lines as weel as the fuel tank..(checked it up for air leak also)....(On Suggestion of Mr. Sharma..(second_chance)
Consulted Anwar: n first thing he suggested was open the third needle... ?Third needle in RL53? I havent heard bout it nor could see it....So,
Anwar posted few interesting threads and i got to know the location and the pros n cons of fiddling with the hidden needle...
3rd and 4th tank: temp did came down by quite a few degree i.e around 110degree celcius.....
I had changes the fuel at this point of time: 15% nitro; Klotz kl200 22%....
So, finally i had to open the hidden needle from 2''o clock position to 12'0 clock and bingo..the temp was aound 80degree celcius at head....main needle at 3 turns...
Today i had leaned the main needle by 3 clicks and temp was around..85 degree....
Will be posting the experience on IDLE up next week..
Once again thanx to Anwar and Second_chance
Doctor