YS 61 Long Stroke "need more help"

[jim ivey]

Larry
If you pressurize the tank and adjust the button in until it quits leaking then this should be the starting point. Don't open any further past this setting.  
Now all your adjustments should be going in until it idles correctly. At this point it shouldn't leak out of the carb. You should be able to choke it and it will draw fuel through the regulator but not leak by itself. When this happens that will prove the needle and seat are sealing ok.Also make sure you have the right spring in the needle-seat assy.
I had a 140FZ that leaked like that and the button was too far out.

Jim Ivey

----- Original Message -----
From: jed241 at msn.com
Sent: Monday, June 30, 2003 8:56 PM
To: NSRCA
Subject: YS 61 Long Stroke "need more help"

As some of you may recall, I've been fighting this YS 61LS for about 6 months. For the last month, I've been able to get it started once and then it would flood, with a river of fuel gushing out of the carb. Verne was actually able to work with me and we got it started a few times in Dayton. Using the same procedure he talked me through, it gushed again and flooded like it just fills up the cylinder when I tried at home....

Before I burn this engine up, I want to explain what I did as an experiment and I'm considering running it to see if it will run with out burning up at the low end.

With the engine removed from the plane, I replaced all O-rings and gaskets. Still leaks like it bleeding from an artery. I decided to connect a pressure gauge and pressurize the fuel inlet and see if I could adjust the regulator to keep it from leaking.

Pressurized to 6psi. It finally stopped leaking at 1-1/4 turns in from flush. Seems that it doesn't leak with the throttle wide open either. If I back it off 1/8 turn, it starts to leak regardless of throttle position.

In talking with Richard from YS Performance, it should be leaking at all when set up properly. But I didn't talk to him about this kind of adjustment.

Question of the day...Since the regulator screw just so happens to adjust the low end mixture as well, will I burn up the engine because it could be too lean? Is it more likely that I have a damaged seat for the seal thus leaking by at the "Normal" position of flush?

I couldn't see any damage, but this is the only possible conclusion I can make at this point with the results of my bench work.

Larry
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