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XRAY Lightweight Aluminum 2-Speed 2nd Gear Carrier w/Ball Bearing (Orange)
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O.S. 21XZ-B V-Spec Off-Road Competition Buggy Engine

Average rating: 5 of 5 Stars!

O.S. 21XZ-B V-Spec Off-Road Competition Buggy Engine
Displaying 1 to 12 (of 12 reviews) Result Pages:  1 
Wilson George - Rating: 5 of 5 Stars! Verified Owner Sunday, June 10, 2012
For the price you can't go wrong with an OS engine. Once I figure out the adjustment screw high side low on the carb (which is a mid speed adjustment) this engine screams. Paired up with a JP3 pipe and it keeps up with and out preforms some of the higher end engines out there. You have to take your time and break it in right once it is done, set up and maintaining a tune are a breeze. very consistent engine.
2 of 2 customers found this review helpful.
Charles Mims - Rating: 5 of 5 Stars! Verified Owner Sunday, September 25, 2011
I have 2.5 gallons through this mill and I am very pleased with the performance.great idle with no flame outs. good smoth powerband.I have owned alot of mills but os is the real deal.Its a great feeling to know that this engine is very reliable. THANK YOU OS!!!!!!!!
2 of 2 customers found this review helpful.
John Taylor - Rating: 5 of 5 Stars! Verified Owner Thursday, August 30, 2012
I like this motor better then the speed version, seriously. I ahve tried many motors and seem to always go back to O.S. for power, easy tune and reliability. I had the spee version earlier this year and it ran good but I wanted more low end power and this did it. Thanks and under $290 too!!
1 of 1 customers found this review helpful.
Sean Dickinson - Rating: 5 of 5 Stars! Verified Owner Thursday, June 21, 2012
This is a great engine. Not the easiest to break in, but after break-in, it is easy to tune and very reliable. I use P4 plugs in Phoenix, AZ and as long as I have a smooth throttle, I easily get over 10 minutes run time in a buggy. Power is smooth and very predictable, not hard at all to control and definitely worth the less than 300 price tag. Overall pleased with my purchase.
1 of 1 customers found this review helpful.
Edward Yishar Quiroz - Rating: 5 of 5 Stars! Verified Owner Thursday, February 20, 2014
Amazing motor lo uso en 2700m sobre el nivel del mar, solo tuve que retirar el restrictor y su rendimiento es increible.
Themistoklis Kardamis - Rating: 5 of 5 Stars! Saturday, January 18, 2014
AMAZING engine !!! OS will never let you down ! Very easy break in (you MUST warm up the engine first) and is very fast ! I run with some lefrover 20% nitro fuel and i can say both acceleration and top speed are great in my Xray XB9 ! The engine was running at 80C-90C for about 20 minutes (2 tanks 127cc each) with the OS P3 glow plug ! (Ultra Hot) From now on i will run with 25% nitro fuel and OS P4 Glow Plug (Super Hot) i can't believe how fast this amazing engine will be !
Mike Johnston - Rating: 5 of 5 Stars! Sunday, July 28, 2013
This is such a great engine! I have mine in a Jammin X1 CR and man does this engine run!! Awesome engine I would recommend this engine to any one just want a decent racing engine. I have a Jammin Jp 4 pipe hooked up too it. It just has so much power!
ALEJANDRO RIBERO RUEDA - Rating: 5 of 5 Stars! Sunday, June 16, 2013
Solo puedo decir.... que motor.... Después de despegarlo con toda calma, 5 tanques quieto, y como ocho luego cerrando la aguja de altas de a una hora por cada tanque, empezó a despertar..... tiene todo, pique, fondo y sobre todo, cuando queda en mínimas se siente mejor que todos los motores que he tenido. Lo tengo con la pipa 2060 y de verdad que valió la pena la inversión. Después de varios años de competencias le había perdido el gusto a usar mi buggy por diversión en otro lugar que no fuera [More…]
Scott Hawkersmith - Rating: 5 of 5 Stars! Verified Owner Wednesday, March 06, 2013
I have raced and run numerous engines...this by far is the best engine for the money,,,I have run the OS speed for years and have found this engine performs just as well without the extra cost....Just be aware this is a racing engine so keep a good p3 plug in it and you will have no problems.....
Sergey Slavin - Rating: 1 of 5 Stars! Monday, June 04, 2012
Very high-priced hobby engine. Not more than hobby. May be I was not lucky with it, but RTR HPI .21 engine was better than this one. Although it didn't crash it's connecting's rod ring on 2nd gallon of fuel! Also 2 cents about it's performance: It's good enougth with right exhaust. 7-8 minutes on tank of fuel in my buggy or it screams and starts overheating. No more O.S. for me.
0 of 2 customers found this review helpful.
Marian Miller - Rating: 5 of 5 Stars! Sunday, September 18, 2011
This is a great engine with excellent run time my racing buddy has 2 one for each buggy and truggy & I've never saw him flame out . It actually makes me want to buy the speed version & go that extra mile just to make him jealous .
1 of 5 customers found this review helpful.
Alain Lizotte - Rating: 2 of 5 Stars! Saturday, September 10, 2011
Did't get lucky with this engine. Paid attention to do a very good brak in, but this engine is all but reliable. But the power and speed are very good. I just couldn't get the idle to be correct. It goes slower and slower as the engine is warming. After 5min, the engine want to stall. I replaced the front bearing but it didn't last 1 race day... My friend has the exact same engine and had no problem with it. I guess mine way made on a friday...
0 of 3 customers found this review helpful.
Displaying 1 to 12 (of 12 reviews) Result Pages:  1 
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O.S. 21XZ-B V-Spec Off-Road Competition Buggy Engine
I have 2.5 gallons through this mill and I am very pleased w ...
5 of 5 Stars!
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