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Old 09-12-2005, 09:11 PM   #1
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OS .21 rg in Hyper 7 pro

Hi, I just bought a OS .21 RG engine for my Hyper 7. I was running a Hyper .21 8 port race,,but it seemed to always run hot. I heard only good things about this OS engine and just wanted to know what some of you guys think? Is it easy to tune? I dont think my hobby shop sells OS plugs,, I was running a duratraxx plug in the Hyper,,what type of plug should I look for? Last thing does anyone know the fact needle settings for this OS engine? thanks.
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Old 09-12-2005, 09:14 PM   #2
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I have an RG as a practice engine. Very reliable, easy to tune and decent in terms of performance. Just don't expect to run with the $300 racing .21 engines though.
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Old 09-12-2005, 09:27 PM   #3
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cool!! I just start out of off road buggys. last week was my first race and I came hoe with a trophy(sp) it was for 5th place,,but i was happy.
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Old 09-13-2005, 04:10 AM   #4
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Quote:
Originally Posted by Thai3g_Eclipse
I have an RG as a practice engine. Very reliable, easy to tune and decent in terms of performance. Just don't expect to run with the $300 racing .21 engines though.
I'm betting some of those people with the $300 racing engines would be faster with a RG.
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Old 09-13-2005, 08:32 AM   #5
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Quote:
Originally Posted by AWOLsoldier
I'm betting some of those people with the $300 racing engines would be faster with a RG.
I usually am...
The RG's stock needle settings are EXTREMELY rich. When you start it for the first time fuel will spray out of the pipe. If yours is like this then immediately lean the HSN a quarter turn. If it still does it then lean another quarter turn and keep doing that until it's not sputtering and spitting fuel. You want to get the engine up over 200f as soon as possible. It's even a good idea to use a heat gun to warm the engine before the first start up. The whole idling rich method of break in is no good.
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Old 09-14-2005, 07:12 PM   #6
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the plug you want to run is the os a5. if you do run another brand make sure you get a os type. the os plugs are shorter than rb or novarossi plugs. i beleive odonnel makes plugs for os.
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Old 09-15-2005, 06:25 AM   #7
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The Odonnell OD99 "OS" seems to last longer than the A5 for me. They cost $3.75 at Amainhobbies.com. Run the stock #8 plug if you're running 20% nitro and a colder plug like the two that cmain mentioned if running 30%.
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Old 09-15-2005, 10:42 AM   #8
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I like the mcoy 59
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Old 09-15-2005, 03:30 PM   #9
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McCoy 59 is similar to the OS #8. Make sure you use 2 copper washers with the McCoy, it a standard length plug and OS's take a short plug. Standard plugs work if you double up on the washers.
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Old 09-15-2005, 09:47 PM   #10
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do you guys think the McCoy-9 will work with this OS engine? The guy at the hobby shop told me its a cold plug.
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Old 09-16-2005, 05:30 AM   #11
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A McCoy 9 would work well when running 30% nitro (it's similar to a OD99 or OS A5), probably not as well with 20%. Don't forget to run 2 copper washers with that.
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Old 09-20-2005, 08:44 PM   #12
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ok,,thanks. Yes I have been running it with two copper washers,,,just to throw it out there,,,what would happen if I only used one washer?
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Old 09-20-2005, 09:09 PM   #13
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shit would blow up!

no, your piston would probably hit the plug and cause irreversible damage.
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Old 09-20-2005, 09:12 PM   #14
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If you remove a washer, the piston won't hit the plug but you will probably eat up plugs more frequently and possibly have detonation problems that cause piston/rod damage.
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Old 09-21-2005, 01:24 AM   #15
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People have been using long plugs in O.S. motors with no problems forever..it doesn't do anything bad, it's just that O.S. heads are designed with the shorter plugs in mind to keep the combustion chamber the correct shape. You won't notice any difference.
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