YS .53 Issues - Please help

[Van - E-Mail LIST]

All,

I purchased a used YS .53 a few weeks ago, I'm "NOT" a YS expert by any means, but I usually get around them pretty well, I'm just having some issues with getting her to run correctly.

Here is my problem:

Prime the motor until fuel comes out the carb, and "1" flip, it starts right up. The motor runs strong for about 3 or 4 minutes, but will not idle below about 3300 rpm, it just dies. I have seen cases when the regulator was sticking and causing a similar problem, so I loosened the reg screw a couple turns, and I could see fuel move through the fuel line, I would then return the regulator screw to it's proper place, it would run about 4 minutes, and the same thing would happen.

I removed the regulator screw, o-ring, piston and diaphragm, they where VERY gummy, so I cleaned them very well and re-installed. Motor runs better, and will idle around 2500 as of now, but fuel POURS out of the carb even if I have the throttle closed off.

I'm using 20% Cool Power with added oil to bring the content to 20%, and OS "Type F" plugs. APC 11x7 prop

The motor is set at 2 1/2 turns open on the High Speed needle, and 1 turn open on the low needle.

The check valve I am using is from an OS 1.40, not a YS, there was no YS valve with this engine.

Questions: 

1 - Why the fuel pouring out of the carb ?
2 - How do I get the idle better adjusted.
3 - Should any further cleaning be done to the engine ?

Much thanks !

________________________________________
Van Flowers
NSRCA "K-Factor" Advertising Manager
AMA 6216,  NSRCA 2778
813-784-3794
extra330 at tampabay.rr.com
www.nsrca.org




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