Ninja JX21 - B01A vs Novarossi 21-4C vs OS Speed

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  • Hi!

    I'm wondering what is better ? Please for your opinion.

    Regards

    Kuba
  • Well I am sure some will argue this, but in regards to those 3 choices. They are all the same as far as power/ fuel consumption/ reliability/ tunability. I know each has thier quirks, but really its going to boil down to opinions and and price. I have a 21-4C, have seen the Ninjas and Speeds and run with both. I think to be on par with the others, the 21-4C Team is the same price range/ level. Just my $.02
  • Get the one that looks prettiest too you !!!!

    Those are the 3 engines i like the most. If money is no concern OS SPEED is king.
  • OS SPEED all the way! That is if you have the cash for it. The other two are great engines too, but there's just something about the OS SPEED that makes it stick out.
  • Those are the 3 motors that I am currently running this year. All are excellent race motors. They do vary a bit.

    It all depends on what you are putting them in, as well as what kind of tracks you race on.

    Either way, you can't really go wrong with any of them
  • Novarossi 9901 pipe would be good for Ninja or OS speed ? or better is OS 2060 ?

    Regards
  • Quote: Novarossi 9901 pipe would be good for Ninja or OS speed ? or better is OS 2060 ?

    Regards
    You want the 2060 for the SPEED or Ninja.
  • As great as the Speed is......it's still overpriced. And yes, I've seen one run. I pitted for a guy a month ago who had a speed in his truggy, solid running engine, and great runtime.

    But still, it's not 160$ better than the other two IMO. 160 is only 40$ shy of a B5 which I would rather have two of, than one speed.
  • How about strength ? about 7-8 with one conrod change? (ninja or os)

    I heard the Ninja is very similiar to OS Speed ,it's true ?

    Regards
  • Quote: How about strength ? about 7-8 with one conrod change? (ninja or os)

    I heard the Ninja is very similiar to OS Speed ,it's true ?

    Regards
    Yeah they're pretty similar. They're both made by OS. They will both go 7-8+ gallons with a bearing and rod change.
  • buy a radical and you can go 12 gallons without ever touching it, heck im at 5 in mine and still have the same plug from break in. Radical 621t all the way
  • Quote: Novarossi 9901 pipe would be good for Ninja or OS speed ? or better is OS 2060 ?

    Regards
    I didnt like the 9901 pipe on the speed engine. Personally I think OS engines tune easier, but thats my opinion. I have 3 speeds, I blew one up a few weeks ago. It was just its time. I race 2x per month avg and that speed lasted just over a year with 1 p/s/r change and a few bearings but great engines. It even lasted through the 10 min mud bog at the nitro challenge in Feb and through the dust storm at silverstate a month later.

    Did I mention I like speed engines.
  • All 3 of them are top notch engines. As Unsober1 stated and i 100% agree, you really cant go wrong with any of them.
  • Quote: All 3 of them are top notch engines. As Unsober1 stated and i 100% agree, you really cant go wrong with any of them.

    If you pick up one of these motors and still desire something extra that most don't have, send them over to Adam at AB mods. Thats what I did for all 3 of them.

    Secret weapons for all conditions.
  • Shall we throw the NR FMS and the RB WS9 in this mix, or is that too much power?


    The OS Speed is a great $300 engine, too bad you can't buy them for that.
    Of these 3 I'd pick the NR +4 as it can do everything the OS can and costs less, lasts longer.