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Old Feb 25, 2014, 11:14 AM
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Original YS .60 Short Stroke Parts

Hi, I am in need of an original YS .60 needle socket. This is the brass piece that screws in to the carb. If you have one you can part with please let me know. Also, if you have any side exhaust engines or other parts you're not needing, please let me know.

Thanks!
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Old Feb 25, 2014, 05:57 PM
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Tony,

I have a nib .60 side exhaust (older style) for you. Trying to upload pictures.

David
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Old Feb 25, 2014, 06:26 PM
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Here we go. Doesn't appear to have ever been run. Clean piston, sleeve, no teeth marks, etc. And the older style with the blocky square carb base.

David
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Old Feb 28, 2014, 10:12 AM
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pristine example of the early sand cast case series
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Old Feb 28, 2014, 06:35 PM
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Thanks. I took a closeup look at the head. It is machined it appears.

David
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Old Feb 28, 2014, 06:50 PM
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David,

these engines were very much like the YS45's. I believe their heads are forged rather than machined. Albeit good forging I must say.

The latter YS60 shorty's had machined aluminum heads which were anodized much like the long AR's but obviously round.

Your engine is certainly a somewhat rare specimen of the early YS60's although not the really early ones which had a separate YS regulator and Enya carb like Yoshioka used in his BA.

David
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Old Feb 28, 2014, 06:56 PM
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Thanks David.
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Old Feb 28, 2014, 07:54 PM
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Here's a pic of the later model machined head. You can compare this with the pic of David's engine. The "cast" heads were still machined on the exterior and for the fit into the cylinder. But the fins were not machined.
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Old Mar 06, 2014, 02:11 PM
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Here is another angle/view of the heads of the YS 60's
the later version on the right as you can see is also blocky/squared in shape except for being fully machined.


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Description: David's older YS 60 Name: YS 60.jpg
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Description: One of mine, newer YS 60
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Old Mar 06, 2014, 06:43 PM
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Now I'm going to have to take a closer look at mine.

David
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Old Mar 06, 2014, 06:59 PM
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I also think the later models were ported differently then the early ones. In these two pics note that the earlier engine on the left has no bridge in the exhaust port like the one on the right. I think the intake ports were also higher on the earlier engine. This was in line with the switch from the high RPM days before the noise rule to the bigger props turning lower RPM's.
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Old Mar 06, 2014, 07:12 PM
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This is a solid piece of aluminum. Some say it's cast but it looks machined to me.

David
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Old Mar 07, 2014, 02:01 AM
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Of course some of that head is machined. You can't get the needed dimensional tolerances purely from a casting. It starts life as a casting then is machined as required. The later model heads were fully machined from a billet. It's really easy to see when you look closely at the fins. They are tapered, slightly thinner at the top then at the base. The outside of the head also shows this slight taper. This is needed to get the part out of the mold. On the "machined" heads there is no taper of the fins.
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Old Mar 07, 2014, 05:06 AM
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That helps explain it. Thanks Tony.

David
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