Ninja JX21 B03

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Old 07-22-2015, 07:36 PM
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Originally Posted by rage1945 View Post
Wow! $500 plus!! Os Speed it is!! Was going to get this but too much $ for my blood!! Nice motor though!!
I see them for mid 400 lots of places. Just don't get it through Tower.
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Old 07-23-2015, 10:27 AM
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Mugen Ninja is also coming out with 2060 and 2090 pipes with the pressure nipple facing the rear instead of the front like OS.
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Old 08-12-2015, 11:46 AM
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Hi guys, so..Someone got this motor fired up and running yet?
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Old 08-12-2015, 12:47 PM
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its an awesome engine, just as you would expect. Super smooth, tons of high end, plenty of bottom. Great buggy engine.
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Old 08-12-2015, 05:12 PM
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Can anyone confirm that B03 is a copy of B2101? Or there are some differences?
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Old 08-12-2015, 08:39 PM
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edit: useless post, sorry.
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Old 09-15-2015, 11:50 PM
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Does anyone tried the engine ?
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Old 11-07-2015, 03:37 AM
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Hi guys, I am not sure that does this Ninja JX21 B03 fit Novarossi 2090 pipes?Such as 51020M.
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Old 11-09-2015, 10:22 PM
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Originally Posted by muunan View Post
Hi guys, I am not sure that does this Ninja JX21 B03 fit Novarossi 2090 pipes?Such as 51020M.
i dont see why not.. as i used a soar racing pipe with my reds before getting a Hipex... ie exhaust outlets dont seem to change in size..
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Old 12-11-2015, 07:12 AM
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Need some help. I am getting into the nitro scene and kind of torn between motors. I am looking at the Protek Samurai, Ninja JX21-03, and O.S.-2101. The cost of the Protek is appealing. I've scene in previous posts that these 3 motors are basically identical. Can anyone confirm? Also, what would be your preference of the 3?
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Old 12-11-2015, 07:18 AM
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Originally Posted by Bobby A. View Post
Need some help. I am getting into the nitro scene and kind of torn between motors. I am looking at the Protek Samurai, Ninja JX21-03, and O.S.-2101. The cost of the Protek is appealing. I've scene in previous posts that these 3 motors are basically identical. Can anyone confirm? Also, what would be your preference of the 3?
The ninja and OS are the same. The Protek is very different. It is a short stroke engine built off of the older OS speed engines. It is was my choice I would go with the Protek.
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Old 12-11-2015, 11:14 AM
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Originally Posted by Bobby A. View Post
Need some help. I am getting into the nitro scene and kind of torn between motors. I am looking at the Protek Samurai, Ninja JX21-03, and O.S.-2101. The cost of the Protek is appealing. I've scene in previous posts that these 3 motors are basically identical. Can anyone confirm? Also, what would be your preference of the 3?
Yanman hit it right on.

This motor is a rebadged B2101. The Tessmann B2101 is also nearly the same, though the 2090 header is different. All three of them have a square (same) bore/stroke.

The Protek has VZB (short stroke) internals in a spec 2 (XZB) block.
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Old 06-06-2017, 04:29 AM
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Ninja JX21 B04 engine JX21-B04 Ninja Engine
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Old 06-06-2017, 03:47 PM
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Originally Posted by kyosho28 View Post
Ninja JX21 B04 engine JX21-B04 Ninja Engine
Looks very similar to Blok engine for me
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Old 06-07-2017, 05:40 AM
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Because of the silver head? Its the same engine as a B2101/Ninja B03 except for it has the new 22C carb, New silver graphic head and a Steel rear bearing instead of ceramic.
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