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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › 91SR-3DS parts list - High Speed needle
06-02-2012 10:36 PM  6 years agoPost 1
ticedoff8

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Morgan Hill, CA. USA

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Flying around last weekend, the entire high speed needle assembly came loose and disappeared.

I looked on Ron's HeliProz South, and ordered some parts that I thought would replace it:
YS2700 - High speed needle seat (140, 53) -
http://www.ronlund.com/rcheli-prod/...1SR/YS2700.html

YS4140 - High speed needle (61ST2) -
http://www.ronlund.com/rcheli-prod/...SR/YS4140.html.

YS2695 - Needle O ring -
http://www.ronlund.com/rcheli-prod/...1ST/YS2695.html

YS2705 - Needle seat O ring set -
http://www.ronlund.com/rcheli-prod/...0ST/YS2705.html - Web site shows 3 - actually only 2 in package.

YS2710 - Needle valve detent -
http://www.ronlund.com/rcheli-prod/...1ST/YS2710.html

The problem is that when I compare the replacement parts from Ron's to the parts that are still on my 2nd YS 91SR-3DS, they don't quite look the same.

Mainly, the high speed needle is shorter than the HS needle on the 2nd motor. And, when screwed all the way in, it stops at the shoulder of the knurled end rather than "feeling like" it seats on the needle.

Just a quick visual comparison - It LOOKS like the high speed & mid-range needles on the 2nd engine could actually swapped.
Assuming the needle from Ron's is the right needle (high speed), then the 2nd engine LOOKS like it has the "high speed" needle screwed into the mid-range seat.

Is there a definitive parts list for the YS 91SR-3DS that details exactly what parts are needed to replace the hight speed needle assembly (seat, needle, O rings & detent)?

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06-04-2012 12:43 AM  6 years agoPost 2
JPhillips

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Waco, TX

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On the 3DS the high speed needle is the shortest one.

Link for parts listings.

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06-04-2012 10:35 PM  6 years agoPost 3
ticedoff8

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Morgan Hill, CA. USA

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Thanks.
It was the hover needle assembly that blew out, not the high speed.

But, it turns out that all the parts I ordered (except for the needle) are for the hover needle in the 91SR-3DS - even though they are marked "High Speed".

According to the factory guy, the "Hover needle seat" on the 91SR-3DS is the "High Speed needle seat" on the YS 140 & 53 4-stroke engines.

I need the hover needle - YS4485.

And, it is the longer of the two needles

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06-05-2012 01:03 AM  6 years agoPost 4
JPhillips

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Waco, TX

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Your OP indicates it's the high speed needle; which is why I posted that.

Glad you got it.

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06-05-2012 09:58 PM  6 years agoPost 5
ticedoff8

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Morgan Hill, CA. USA

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I screwed up - I thought it was the HS. But I really needed the hover needle assembly.
The really screwy thing is, I ordered the 6 parts based on the description in the web site - everything listed under 91SR-3DS "high speed" (remember, I thought I needed the HS needle) and got 5 out of the 6 correct parts - all for the hover needle assembly.

The one part that is wrong: The actual needle. The needle I got actually the high speed needle for the 91SR-3DS.

Looking at the PDF file you linked to, it is not the -3DS, but it is close enough.

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06-05-2012 10:16 PM  6 years agoPost 6
JPhillips

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Waco, TX

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It is indeed for the 91 SR 3DS. The file says 91SR S, which is what the side of your engine and mine says, which is a 91 SR 3DS.

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