YS 61 Long Stroke "need more help"

[jim ivey]

Larry
By the way the needle, seat and diaphragm are cheap enough. Replace all of it and start over.
 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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