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NEW OS 21 XZ-B and Speed XZ-B

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Old 11-03-2012, 08:07 AM
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I run one of the XZ-B's and love it. It seems to me like the powerband is pretty well smooth and all around. That meaning that where you make peak power really depends on the pipe. Bottom end pipe will give you ballistic bottom end and vice versa.

For a truggy you could go with the standard 2060 or 2090 pipes, but they are very expensive. I run the reedy 2035 and 2039. The 2035 doesn't give the best mileage but it will give a truggy all the bottom end power you'll need, and the 2039 I would have to not recommend for truggy. It's more all around power, but won't give a truck the grunt it really needs.
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Old 11-03-2012, 08:45 AM
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Here in Germany the 2041 is really popular for OS...
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Old 11-03-2012, 10:44 AM
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Default os 21max xzb help

hello to all
im trying to break in a re-pinch 21xzb, i cant get it to stay at idle im using a p4 plug,when i raise the idle it acts like if it was lean pls help
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Old 11-03-2012, 04:45 PM
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The blue head xzb is a great mill. I have two. One in buggy one in truggy. Both running the 2090. Tons of power. Great gas Miliage. Easy to tune. And very dependable. I think it's a great mill if you don't want to drop the coin on the speed. I personally don't think the speed at twice the price of the blue head is worth it.
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Old 11-03-2012, 05:16 PM
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Originally Posted by CarFanatic View Post
The blue head xzb is a great mill. I have two. One in buggy one in truggy. Both running the 2090. Tons of power. Great gas Miliage. Easy to tune. And very dependable. I think it's a great mill if you don't want to drop the coin on the speed. I personally don't think the speed at twice the price of the blue head is worth it.

I agree on the quality and consistancy of the blue head or any of the others...imo, and in a perfect world, the blue head really needs a coated crank...the new ones arent much better than the notorious old vzb's...unfortionate really...ninja crank in blue head or sidewinder is "perfect world" scenario....bo1 and vzb i know the ninja had more timing than the speed, not sure of that yet on the new ones.. u need the coating....u dont need the weight...its called a weight, but the speeds are lighter than the ninjas...in the vzb/bo1 models anyway...

A speed xzb button does benefit the other lower models some and so does a reasonably simple backplate mod...but none are more important or as good of an upgrade to blue heads as a coated crank...

Last edited by oilguy; 11-03-2012 at 06:02 PM.
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Old 11-03-2012, 09:04 PM
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I agree the dlc coated cranks last forever its the best upgrade you could add If your planning to rebuild. I've rebuild my prior speed multiple times that's the best part of buying an speed superior carb, performance and its longevity.
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Old 11-04-2012, 12:20 AM
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Originally Posted by bigjayjay1 View Post
I agree the dlc coated cranks last forever its the best upgrade you could add If your planning to rebuild. I've rebuild my prior speed multiple times that's the best part of buying an speed superior carb, performance and its longevity.
Mileage, drivability, and resale arent bad either..
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Old 11-04-2012, 12:42 AM
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Pics of backplate mod....picco calls it a ramped backplate....easy to do, if u have a block cut in half like i do, makin it much easier to see how much different the xzb and bo1 blocks really are, and can match the case ports/ runners with the cuts on the plate... u dont wanna remove much, like the novas and jammins have a dished pocket of sorts in this area but it increases internal volume...the angle cuts are also slanted forward a couple degrees....

I moved 2 months ago and lost my retired machinist who did my button mods and was workin on a ball end attachment for doin the backplates, so rite now im lookin for another machinist and just performing the backplate mods by hand with outstanding results and feedback....dont be scared to look inside ur block through the top with no p/s in it, and insert the backplate, mark it with a scribe or paint pen, and mod it urself....its just a backplate and its worth spendin the time or money either way
Attached Thumbnails NEW OS 21 XZ-B and Speed XZ-B-ebmods_vspec_backplate.jpg   NEW OS 21 XZ-B and Speed XZ-B-imag0820.jpg  
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Old 11-04-2012, 12:54 AM
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Originally Posted by dan2721 View Post
hello to all
im trying to break in a re-pinch 21xzb, i cant get it to stay at idle im using a p4 plug,when i raise the idle it acts like if it was lean pls help

Who pinched it?

Check and/or replace every carb oring, especially the pinch bolt ones, check ur head clearance - should be a copper and a silver shim, check rod slop on crank pin, etc....

Imo, the first and best step is set ur idle gap to just a tik under 1mm first, so u know where ur at, then just fatten stuff up and try again....should be a piece of cake but the slightest pinch, or fold in an oring can ruin many attempts to fine tune and create even more frustration than its worth for not havin an oring set layin around for it.....i use the arrow kit found at answer-rcusa.com , part # A-ST-014 for $9...it does not include the most fragile of all orings though, the pinch bolt ones are all on there own....
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Old 11-04-2012, 01:02 AM
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Originally Posted by Herrsavage View Post
I like the XZ-B head..
Me too....especially after drilling them!
Attached Thumbnails NEW OS 21 XZ-B and Speed XZ-B-imag1853.jpg   NEW OS 21 XZ-B and Speed XZ-B-imag1850.jpg  
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Old 11-04-2012, 09:32 AM
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arent the speed and blue head carbs similar or the same?
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Old 11-04-2012, 03:52 PM
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Originally Posted by CarFanatic View Post
arent the speed and blue head carbs similar or the same?

Only difference is the color and carb inserts
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Old 11-04-2012, 04:26 PM
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ok cool I thought so.
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Old 11-08-2012, 06:12 AM
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Hello,
I'm about to buy a OS XZ-B (blue head) and I will like to have your opinion on the exhaust manifold and the exhaust pipe to use with this engine.
Thank you.
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Old 11-08-2012, 06:20 AM
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os speed 2090, os speed 2060 or werks 2058
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