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OS Carbs - 21J Ver 1,2,3

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Old 03-27-2018, 08:48 AM
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Default OS Carbs - 21J Ver 1,2,3

Hoping someone might have some insight into the differences between the 21J carb versus the 21(J).

The 21J was standard on the Spec II engine while the 21J(B) carb was standard on the B2101.

I'm considering placing the 21J carb onto a B2102 as I have heard the tuning performance is much better. than the stock 22C carb.

I have noticed there are more recent versions of the 21J carb as well (i.e 21J2 and 21J3, included on the new Drake Motor). Not sure if these would be better alternatives?

Any insight would be appreciated! Thx!
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Old 03-27-2018, 02:06 PM
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Put the 21J off a Tessman on my 2102 and it works awesome
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Old 03-27-2018, 10:41 PM
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Hello skrichter,

The O.S Carburetor in each engine model are as follow,

21XZ-B Spec I - Type 21J2(B) - 2010
19XZ-B - Type21J2(B) AR6.0 - 2011
21XZ-B Spec II - Type 21J(B) - 2013
B2101 - Type 21J(B) R6.0 - 2014
21XZ-B Spec III - Type 21J3(B) R6.5 - 2016
B2102 - Type 22C(B) R6.0 - 2016
B21AD - Type 21J3(B) - 2017

21XZ-B Spec I and 19XZ-B has Short Metering Needle (Low Mixture Needle)

The above Carburetor are the only two that has Short Metering Needle (Both with same Needle Part Number). 21XZ-B Spec I comes with 6.5mm Venturi while 19XZ-B comes with 6mm Venturi.

XZ-B Spec II and B2101 have the same Carbutetor, the only difference is the Venturi type. The B2101 has the newer type Venturi.

XZ-B Spec III and Adam Drake have the same Carburetor, the only difference is also the Venturi.

The above four Carburetors are actually the same, the only difference is the Thermal insulator design. The 21J3 Body has the newer Black Insulator without the additional lower thin ring.

B2102 Carburetor is the different between the rest.

Hope this is clear enough..

Cheers..
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Last edited by stanleyw808; 08-07-2018 at 10:11 PM. Reason: Additional Information
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Old 03-28-2018, 08:25 AM
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Originally Posted by stanleyw808 View Post
Hello skrichter,

The O.S Carburetor in each engine model are as follow,

XZ-B Spec II - Type 21J(B)
XZ-B Spec III - Type 21J3(B) R6.5
B2101 - Type 21J(B) R6.0
B2102 - Type 22C(B) R6.0
Adam Drake - Type 21J3(B)

XZ-B Spec II and B2101 have the same Carbutetor, the only difference is the Venturi type. The B2101 has the newer type Venturi.

XZ-B Spec III and Adam Drake have the same Carburetor, the only difference is also the Venturi.

The above four Carburetors are actually the same, the only difference is the Thermal insulator design. The 21J3 Body has the newer Black Insulator without the additional lower thin ring.

B2102 Carburetor is the different between the rest.

Hope this is clear enough..

Cheers..
Perfect!!!! I can't thank you enough for taking the time! Much appreciated!

I'll take the carb out of my Spec II and place it in my B2102 and see how that turns out.
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Old 03-28-2018, 12:31 PM
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You can look right in the top of the slide and see a big difference.

The 22c has a built in 6.5mm (or so) restrictor. In case you mix them up..

The 21j carb is more user friendly.
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Old 08-07-2018, 09:22 PM
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Hey how's it going, so I bought a truggy a while back and it came with a os speed spec 2 the guy also gave me a couple extra os carbs. So the one carb in engine has a long needle. He gave me a another carb with long needle and another carb with short needle. They all say 21j on the carb. Do all the carbs just say 21j? I know there is a couple differnt 21j carbs
Since I didn't buy this engine new, what is the stock needle that comes with 21j carb on os speed spec2. Note this one is not the tessman spec 2.
Please only answer my questions if your 100 percent sure thanks.

Anyone use the the 21j carb on non os speed engine? Probably going to try it out tomorrow on another engine.
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Old 08-07-2018, 10:10 PM
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Hello jersey,

Please see my updated post above..

Cheers..

Originally Posted by jersey View Post
Hey how's it going, so I bought a truggy a while back and it came with a os speed spec 2 the guy also gave me a couple extra os carbs. So the one carb in engine has a long needle. He gave me a another carb with long needle and another carb with short needle. They all say 21j on the carb. Do all the carbs just say 21j? I know there is a couple differnt 21j carbs
Since I didn't buy this engine new, what is the stock needle that comes with 21j carb on os speed spec2. Note this one is not the tessman spec 2.
Please only answer my questions if your 100 percent sure thanks.

Anyone use the the 21j carb on non os speed engine? Probably going to try it out tomorrow on another engine.
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Old 08-08-2018, 11:04 PM
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Stanley,
I have both V1 and V2 Protek Samurai's, which the only difference is the carb. V2 comes with the 22c carb. I have a mixture of carbs with black insulator and old style.
So do I only need to use the thin black ring with carbs that have the old insulator??
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Old 08-09-2018, 09:08 PM
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Hello kek,

Yup.. With the older style Carb that comes with translucent insulator, You will need to place the Black thin Ring at the bottom of the Carb inlet opening. If You are using the newer Carb with Black Insulator then You don't need the Black Ring.

Cheers..

Originally Posted by kek View Post
Stanley,
I have both V1 and V2 Protek Samurai's, which the only difference is the carb. V2 comes with the 22c carb. I have a mixture of carbs with black insulator and old style.
So do I only need to use the thin black ring with carbs that have the old insulator??
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Old 08-12-2018, 01:41 PM
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Originally Posted by stanleyw808 View Post
Hello jersey,

Please see my updated post above..

Cheers..
thanks. So spec 1 has short needle. Spec 2 3 have long needle. Thanks
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