YS .91 idle setting

[Bob Kane]

The regulator does regulate pressure, it regulates the amount of fuel flow to the carburetor during each rotation of the crank. Turning the screw in increases the tension of the spring, decreasing the flow of fuel. Turning the screw out reduces the tension of the spring, increasing the flow of fuel.
 Ihncheol Park <PatternFlyer at msn.com> wrote:I got confused.regulator in = less pressure?  It is opposite to what I remember.I never remember this correctly even after more than 8 YS 4-stroke engines. Ihncheol-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Terry Brox
Sent: Monday, April 07, 2003 5:20 PM
To: discussion at nsrca.org
Subject: Re: YS .91 idle setting

I too was told that. However, turning down the pressure helped me. I also turn the pressure down on my L's. I know that around 2000 RPM and below, the pump pressure is not to be a factor, that is why they tell you to work you idle adjustments the way they do. Set the High speed needle first, then bring back to idle so it hits 2000 instantly. Then observe if it speeds up immediately or slows down. If it speeds up at first then dies, it is too lean and vice versa. Above approx. 2000, it is working off of tank pressure.      I hope I remembered the suggestions correctly, my earlier recommendation worked for me. You didnt say, however, if the engine sped up at first, but you need more nitro none the less. Good luck, Terry----- Original Message ----- From: Keith Hoard To: discussion at nsrca.org Sent: Monday, April 07, 2003 6:58 PMSubject: Re: YS .91 idle setting
I've got 15% cool power (green), guess I need to get some fuel with more "oomph".  I'm going out to mess with it tomorrow and will try the regulator.   I was looking on the YS engine forum on RC Universe and Dave Shadel stated that the regulator doesn't have any influence on the top or bottom of the RPM range, only the mid-range.  Can anyone else here confirm that??  Keith L. Hoard
Cordova, TN
klhoard at midsouth.rr.com----- Original Message ----- From: Terry Brox To: discussion at nsrca.org Sent: Monday, April 07, 2003 6:50 PMSubject: Re: YS .91 idle setting
You might try turning the regulator in. To get my 91AC to idle, I had to turn the regulator in nearly 3/4 of a turn and idle out 1 1/2 turns. Ran great after that. What nitro are you running? You need a minimum 20%, and 30% is better yet.----- Original Message ----- From: Keith Hoard To: discussion at nsrca.org Sent: Monday, April 07, 2003 5:12 PMSubject: Re: YS .91 idle setting
Yup, got that. . . left is lean, right is rich. . . Just came in from messing with the low speed needle and it is set good for the transition, but it still won't idle for more than 20-30 seconds.  I run it full throttle for about 10 seconds to pressurize the tank then drop it to idle - 2000 to 2400 RPM.  The engine idles at this speed for about 20-30 seconds then the RPM slowly decays until it quits, then fuel drips out of the carb (engine inverted).  I relight the glow plug, spin the engine and it starts right up again and repeats.   Keith L. Hoard
Cordova, TN
klhoard at midsouth.rr.com ----- Original Message ----- From: Terry Brox To: discussion at nsrca.org Sent: Monday, April 07, 2003 5:03 PMSubject: Re: YS .91 idle setting
Low speed is an airbleed. Out is leaner, in is richer. Opposite from the high speed.----- Original Message ----- From: Keith Hoard To: NSRCA Mailing List Sent: Monday, April 07, 2003 4:51 PMSubject: Fw: YS .91 idle setting
 From: Keith Hoard To: NSRCA Mailing List Sent: Monday, April 07, 2003 3:06 PMSubject: YS .91 idle setting
Gentlemen,    I'm breaking in my YS .91FZ and seem to have gotten the top end working fine, but the engine idles at 2000 RPM for about 10 seconds then slowly dies.  I don't remember which way to turn the low speed needle, and the YS Performance page seems to have been hijacked.  Thanks!!    Keith L. Hoard
Cordova, TN
klhoard at midsouth.rr.com

Bob Kane
getterflash at yahoo.com


---------------------------------
Do you Yahoo!?
Yahoo! Tax Center - File online, calculators, forms, and more
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20030407/d4e62d88/attachment.html