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New OS XR-B motor version II

Old 10-06-2017, 06:10 PM
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I had the first BH xzb with the 3 needle valve carb and it ran great! the only time I had trouble with it was when the the temp drop below 70 degrees but it was a screamer. I ran about three gallons thru it with a jammin Jp4 and it plenty up power for me! My new one is mounted in my car and it will get broke in soon
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Old 01-22-2018, 03:58 AM
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So any more updates on this engine
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Old 04-05-2018, 07:18 AM
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I haven't heard any reviews on this engine for OffRoad. If anyone has anything they would like to share, please do!
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Old 05-24-2018, 11:21 AM
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Only one review in this thread for this motor. Curious if this will be a great choice for buggy? Any feedback is welcomed!
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Old 05-24-2018, 12:13 PM
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Originally Posted by skrichter View Post
Only one review in this thread for this motor. Curious if this will be a great choice for buggy? Any feedback is welcomed!
If itís the same engine as the Bullitt B222, witch I bealive it is, it made the truggy podium at the roar nats warm up. And Iv seen several locals running it in buggy with good success. Seems like a solid mill
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Old 05-24-2018, 03:26 PM
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Old 06-25-2018, 10:24 AM
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So, anyone that has run this in a truggy...what pipe did you use?

What's the verdict? Enough power and mileage to be competitive at a local level or better?
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Old 06-25-2018, 05:30 PM
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Originally Posted by shearpin View Post
So, anyone that has run this in a truggy...what pipe did you use?

What's the verdict? Enough power and mileage to be competitive at a local level or better?
will do good in a truggy, with the 2090 pipe
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Old 06-26-2018, 06:37 AM
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Originally Posted by Expose193 View Post
will do good in a truggy, with the 2090 pipe
Thanks, have been looking for a new engine for truggy and at half the price of a Spec II, this is real tempting.

I just saw the post by nitroal, though Alpha pipes seem to be hard to come by anymore.
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Old 08-29-2020, 04:46 PM
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https://www.redrc.net/2020/08/o-s-en...-nitro-engine/

looks like there is a version 3 coming out. I was thinking of picking up a practice engine, this might be perfect.


Last edited by RCDaddy2105; 08-30-2020 at 01:08 PM. Reason: add picture
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Old 09-01-2020, 08:23 AM
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these were great engines, perfect power for buggy fuel mileage was a little low IMO, the rods were weak in the v2/bullitt222 if you changed it out every couple of gallons you were safe, a DLC crank on the v3 would have been a great addition IMO.....but see they have upgraded the rod in the v3.
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Old 10-01-2020, 02:12 PM
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What the difference between the 21XR-B Version II and 21XZ-B VII to a newbie? How different or similar are they?
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Old 10-01-2020, 03:40 PM
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Originally Posted by rcindia View Post
What the difference between the 21XR-B Version II and 21XZ-B VII to a newbie? How different or similar are they?
hey there, the XR-B is a budget minded, sport motor. Iím sure itís still a good choice, but the o.s Xz-b VII is a higher end race engine that would perform better, be a touch faster, probably get better mileage, and be more expensive. Also, donít quote me on this but Iíve read that you can upgrade the O.S xz-b to O.S. speed spec(crank, piston, sleeve, rod). Anyway, I donít run either of these engines but according to my research you would be happy with both, but I think you would prefer the XZ-b. Hope this helps a bit
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Old 10-02-2020, 07:26 AM
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Originally Posted by Losi215 View Post
hey there, the XR-B is a budget minded, sport motor. Iím sure itís still a good choice, but the o.s Xz-b VII is a higher end race engine that would perform better, be a touch faster, probably get better mileage, and be more expensive. Also, donít quote me on this but Iíve read that you can upgrade the O.S xz-b to O.S. speed spec(crank, piston, sleeve, rod). Anyway, I donít run either of these engines but according to my research you would be happy with both, but I think you would prefer the XZ-b. Hope this helps a bit
Thanks for the help. Looks like only small changes. Certainly XZ-B seems the way to go if the budget can allow it. Even pro racers have good things to say.
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Old 10-02-2020, 07:43 AM
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Originally Posted by rcindia View Post
Thanks for the help. Looks like only small changes. Certainly XZ-B seems the way to go if the budget can allow it. Even pro racers have good things to say.
So I was mistaken yesterday, the xz-b(according to amain hobbies) shares the same piston, rod, and sleeve as the O.s. speed version engines. The x-Zb is probably only lacking the ceramic bearings and DLC coated crankshafts. Either way, x-zb is a great motor and in a whole different league compared the the x-Rb and if you can swing the cost, is definitely the way to go.
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