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Old 05-21-2008, 01:22 AM   #1
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Questions?? Buggy engine: OS MAX-21 RG-X or STS D21B?

Hi All,

Which one is better? OS MAX-21 RG-X or STS D21B?
Both are entry level engine with pretty low price. However I want to compare the two in term of:

1. durability -> how long it last before need repair / replacement / losing compression?
2. reliability -> easy to start / tune
3. performance -> power, speed, etc.

Let's say both are being used in same manner, which one you prefer?

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Old 05-21-2008, 01:32 AM   #2
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OS hands down!! The STS line has not had great success with being a reliable, long lasting engine. I have a local distributor for them and I have seen the motors completely lose pinch after 1 gallon and have seen carbs fall apart during races and it has been on more than one ocasion with multiple drivers. I wouldn't run one if someone paid me to. Thats my opinion but I'm sure you'll hear different things about them so take everyone's opinion into consideration with your decision.
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Old 05-21-2008, 05:06 AM   #3
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Didnt os stop making the rg? Anyways to answer your question, I have a sts 30 with 3 gallons on it and it still runs good. If you can get the old rg I heard they were a great motor, I heard much better than the new vg. I have only seen one run but lots of guys I race with say the rg was a great motor.
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Old 05-21-2008, 09:58 AM   #4
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oups, blowpop, u r right. it is discontinued. in that case maybe I'll check OS 21VZ-B(P), not the v-spec.

Anyone using it?
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Old 12-31-2008, 09:08 AM   #5
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VZ is a great engine. i bought a RG i couple of days ago. it's discountinued but it's a great engine!!
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Old 12-31-2008, 09:22 AM   #6
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Sorry to rain on the parade here, but the RG is honestly a terrible engine. Break in was difficult because it hates to idle and doesn't come with a good carburetor. Once I broke the engine in, it lacked major power, yes I know that it is only a $109 motor but I still expected more. I also put the odonnell head on it and it still was the least powerful .21 motor I have ever seen. For the most part it did run consistently; however fuel consumption leaved much to be desired... The engine lasted about 2-3 gallons for me. You will have a hard time finding one considering they are discontinued but that's for the best. I heard those Go-Tech motors aren't terrible. For the price they seem good and I know the manufacturer/distributor takes care of you if the engine fails or breaks or whatever. But you are definitely better off going with a higher end OS motor or any engine over $200 IMO. Fork out the extra money and go with something good. You will always be able to tell a cheap engine from a btter more expensive one so why gambe? Lastly Happy New Years all!
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Old 12-31-2008, 02:28 PM   #7
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I would recommend the OS
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Old 10-03-2009, 12:33 PM   #8
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Cool starter assembly

Ok so i have read the responses to the OS Max 21 RG. I have had one in a box for years, anyway i have been told it had a lot of torque. i am going to put it in my Savage but i do not want the pull start so i want a starter assembly for it. i tried ordering the OS e starter for the 21 and 30 VG es and it is to small. so anyone know which one i need.
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Old 10-03-2009, 04:32 PM   #9
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RG's are great little engines. Factory HSN setting is crazy rich, you'll pass a tank of fuel through the thing in 2 minutes if: a. you keep it running and b. you don't lean it a little. They make good bottom end torque and like to run 25-275f in case you're still stuck on your heat gun. Don't try to lean the HSN for great top-end, it's just not there (I gear mine up a tooth). Get it running good down the straight then adjust the LSN for good response. It should run as reliably as a weed whacker for several gallons from here with a few glow plug changes.

Engine likes an 086 pipe best.
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