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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS Regulator DRS (Demand Regulator System)
01-18-2018 04:39 PM  10 months agoPost 1

rrKey Veteran


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Good news for OS Engine lovers who run the Pressurized DRS (Demand Regulator System), looks like OS will start selling regulator service parts.
They should all be available toward the end of the month. Note: OS calls the diaphragm as the "regulator seat".

01-25-2018 01:34 AM  9 months agoPost 2


Mexico city

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Thanks alot for the info.
This will allow me to buy the diaphragm as well as the needle and lever when they become available.
It was no fun having to buy the whole regulator every time the diaphragm broke.
Thumbs up for OS

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01-27-2018 01:31 PM  9 months agoPost 3


Killeen, TX

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Exiting news, thanks for the info.

Fly hard, Land safe

01-27-2018 02:27 PM  9 months agoPost 4

rrKey Veteran

Meridian, Mississippi

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Thank you for the information. I suppose the below link will begin to populate when the parts become available?

I navigated to the link by starting at the OS 105HZ-R and clicking "parts list", then clicking on the listed carburetor (61G 91HZ-R Speed), then clicking on its "Parts List". The Regulator Assembly is listed as a part to the carburetor but as of this writing, no regulator sub-parts are listed.

On a slightly tangential note, has anyone ever actually damaged or worn out a DRS regulator? I have 4 or 5 of them on various engines with some as old as 2010 and having accrued over 13 gallons in a 50. All of my DRS carburetors are showing no sign of age. In fact, my 55HZ-R Hyper engine is getting tired and I've begun to wonder if I can buy an engine without any carburetor at all and simply recycle the carb I'm using. With a 40L-R carburetor costing $240USD, and with mine running perfectly, I don't see any reason to purchase a new engine with a new carb I don't need.

Out of curiosity, how many people are looking for DRS parts?

"Well, Nothing bad can happen now."

02-07-2018 08:52 PM  9 months agoPost 5


Kernersville, NC USA

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That IS good news!!

I was getting tired of having to buy the whole thing for big buck$

Thanks for posting this!!


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