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OS R21 .21 1/8 On-road Motor

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Old 09-22-2018, 10:43 AM
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Default OS R21 .21 1/8 On-road Motor

So, I have been looking at this motor. Having run the R2101 & R2102 as well as the old XZ-R V2.

I recall in about 2016 OS had the Shimo R21, as such, I am wondering if these two are related? I can not find the parts listing for the Shimo R21, so its hard to compare. Yet not sure if anyone is yet running the R21 and has anything to share. I am aware that it lacks DLC coating etc. I am not worried about that, as years ago DLC did not exist and we did just fine. Having noted too that its shares many parts here and there with the R2101 and the XZ-r, amongst others.

So if any of you have further concrete info on the motor, it would be much appreciated.
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Old 09-22-2018, 11:07 AM
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If the bore/stroke is the same then a high chance parts can be swapped.
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Old 10-05-2018, 02:12 AM
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Originally Posted by 1/8 IC Fan View Post
So, I have been looking at this motor. Having run the R2101 & R2102 as well as the old XZ-R V2.

I recall in about 2016 OS had the Shimo R21, as such, I am wondering if these two are related? I can not find the parts listing for the Shimo R21, so its hard to compare. Yet not sure if anyone is yet running the R21 and has anything to share. I am aware that it lacks DLC coating etc. I am not worried about that, as years ago DLC did not exist and we did just fine. Having noted too that its shares many parts here and there with the R2101 and the XZ-r, amongst others.

So if any of you have further concrete info on the motor, it would be much appreciated.
The OS R21 is a great value for money and it runs great.
Parts can be exchanged with the R2101/02/03
Check out the spare-parts of the R21 here: www.worldchampionproducts.com/en/493-os-r21

But most of all it has a 5-port liner, so you can use it in the US in the 1/8 PanCars.

I have seen some running and their owners are very happy with it.

Last edited by VS_Rody; 10-07-2018 at 11:37 PM. Reason: spelling error
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Old 10-05-2018, 04:01 AM
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Thanks Rody. I ordered one up to try. I am tempted to try it in 1:8 IC as well for smaller tracks.

Thats good to know about porting, should make the US Pan boys happy, lol.
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Old 10-06-2018, 10:04 PM
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Where can I buy these in the USA?
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Old 10-06-2018, 10:12 PM
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AMain carries them.

https://www.amainhobbies.com/search?fb=2269&t=2&lg=fb
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Old 10-07-2018, 08:06 AM
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one of the best things of OS is the relatively lower replacement parts cost, irresistible and reasonable
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Old 10-07-2018, 08:11 AM
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Originally Posted by choisan View Post
one of the best things of OS is the relatively lower replacement parts cost, irresistible and reasonable
So true, I dont think I have ever regret switching to OS 5 years ago. My biggest plus is their reliability, hands down.
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Old 10-07-2018, 10:59 AM
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Originally Posted by VS_Rody View Post
I meant the stock version MaxR21. Thanks though
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Old 10-07-2018, 11:08 AM
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I got mine from Tower https://www.towerhobbies.com/cgi-bin/wti0001p?&I=LXGZDM
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Old 10-07-2018, 02:50 PM
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Originally Posted by 1/8 IC Fan View Post
Thanks!!
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Old 10-08-2018, 11:12 PM
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Originally Posted by VS_Rody View Post
The OS R21 is a great value for money and it runs great.
Parts can be exchanged with the R2101/02/03
Check out the spare-parts of the R21 here: www.worldchampionproducts.com/en/493-os-r21

But most of all it has a 5-port liner, so you can use it in the US in the 1/8 PanCars.

I have seen some running and their owners are very happy with it.
wow 108e for the piston sleeve and rod that is a really really great price and in my opinion I have run all of them from the 2101 02 and 03, there is something about the 2101 that is just an animal and will last me for the whole season I had the exact same lap times after 25 gallons. I use the original crankshaft that dlc coating last forever, my crankcase is orig. 2101 and the front bearing from 4 years ago I just replace p/s/r when needed and the rear ceramic bearing.
again my opinion all this hype on long stroke high torque motors is a bunch of crap all it does is drop the rpm range and in on road rpm is what is needed not torque!!!!

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Old 10-08-2018, 11:38 PM
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Originally Posted by ralphierace13 View Post
wow 108e for the piston sleeve and rod that is a really really great price and in my opinion I have run all of them from the 2101 02 and 03, there is something about the 2101 that is just an animal and will last me for the whole season I had the exact same lap times after 25 gallons. I use the original crankshaft that dlc coating last forever, my crankcase is orig. 2101 and the front bearing from 4 years ago I just replace p/s/r when needed and the rear ceramic bearing.
again my opinion all this hype on long stroke high torque motors is a bunch of crap all it does is drop the rpm range and in on road rpm is what is needed not torque!!!!
FYI the R2101/R2102/R2103 and R21 have all the same stroke and parts are interchangeable.
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Old 10-09-2018, 02:55 AM
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Hmmmm.... time to lay the hands on one....
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Old 10-09-2018, 04:56 AM
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Originally Posted by VS_Rody View Post
FYI the R2101/R2102/R2103 and R21 have all the same stroke and parts are interchangeable.
rody the 2103 have different part numbers from the 2101 and 2103, for the crankshaft and piston and sleeve. do you know that the diff is ?
I tried once using the crank from a 2103 in the 2101 and had the same head shims for the stock 2101 .03 when I went to start it the piston from the 2101 was hitting the button I had to add another .03 shims
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