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O.S Engines thread

Old 10-28-2020, 09:34 AM
  #2686  
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Originally Posted by Loua28
Hi Pete, thanks for the info. I didn't know about the ports that can cause issues. Just to make sure, why would the rod not work on the B2103. The part number is the same. The part number for the build up kit is 22423110. It is the Tessmann 110% parts.
Oh, you have the Tessmann 110% XZ-B kit. Yes, in that case the rod will fit both the B2103 and the B21 Ty2.
The XZ-B has multiple versions. The original Speed and Speed Spec 2 had longer rods, non-speed Version 2, the Speed Spec 3 and the Ty 110% has the shorter rod, same as all of the other recent engines.
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Old 10-28-2020, 09:58 PM
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Wonder if os coming out with some new tessman model engines wjth updated carb balls and heads etc. they discontinued the ty 110% spec 2 and b21 ty2 engine last week. Or another thought will he switch to Fx engine?
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Old 10-28-2020, 10:05 PM
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Another question, should I use the B2103 crank & head button on my rebuild or use the B2101 TY crank instead? What will the difference be if I'm able to use the B2101 TY crank in the B2103 casing?
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Old 10-28-2020, 10:11 PM
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Jersey, I'm getting my popcorn ready to see what happens...
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Old 10-29-2020, 09:17 AM
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Originally Posted by Loua28
Another question, should I use the B2103 crank & head button on my rebuild or use the B2101 TY crank instead? What will the difference be if I'm able to use the B2101 TY crank in the B2103 casing?
In the B2103 definitely use the B2103 crank. That crank will achieve the required 16.8mm stoke. The Ty2 crank will only provide a 16.4mm stroke, which will not match up with rest of the engine.
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Old 11-05-2020, 09:00 AM
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What os based motor best compares to the spec 3 motor ? I have been waiting hoping they would release a new model but havenít seen anything on the horizon.
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Old 11-05-2020, 09:39 AM
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Originally Posted by Ofna2005
What os based motor best compares to the spec 3 motor ? I have been waiting hoping they would release a new model but havenít seen anything on the horizon.
I don't think they have anything out there that is the spec 3(could be wrong). The closest thing I think would be the new Blok buggy motor, spec 2 internals with spec 3 case.
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Old 11-06-2020, 02:24 PM
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Originally Posted by Ofna2005
What os based motor best compares to the spec 3 motor ? I have been waiting hoping they would release a new model but havenít seen anything on the horizon.
They did away w/the Spec III b/c it didn't fill a need - it didn't have the grunt of the Spec II/Tessmann 110% engine, nor did it have the linearity and good mileage of the 2101 or new 2103. The newest OS engines are the 2103 type R and type S, and the Ronda Drake AD2.
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Old 11-09-2020, 07:07 AM
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Where can I get spec3 case from ? Mines leak right around carb area the warmer the motor gets the more the rpms go up . I tried sealing it, that was a temporary fix .
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Old 11-14-2020, 11:17 AM
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Try eBay. If not there, Tower Hobbies but it'll be full retail.
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Old 11-14-2020, 02:47 PM
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Originally Posted by Ofna2005
Where can I get spec3 case from ? Mines leak right around carb area the warmer the motor gets the more the rpms go up . I tried sealing it, that was a temporary fix .
maybe you you need new gaskets. Get a new insulator piece for the carb throat and a new oring and that might do it.

if that donít work I heard the tekno BM case is a spec 3 case. Iím not 100 percent but was told that from a couple people.
https://www.teknorc.com/shop/tkr1724-crankcase-21bm/

but yea they discontinued the os spec 3 so os says sometimes they only manufacture parts till a year after it gets discontinued sometimes. Last time I looked for a spec 3 case couldnít find them so tekno case MAy be the only route. Iíd try the insulator and gasket first.
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Old 11-16-2020, 10:26 AM
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Originally Posted by Ofna2005
What os based motor best compares to the spec 3 motor ? I have been waiting hoping they would release a new model but havenít seen anything on the horizon.
Samurai S03 and R03 are specs III based! B2103 case and oring head button.
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Old 11-24-2020, 08:41 AM
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Hi everybody , I would like to know what do you use to glue thermo insulator on 21J carb??? Or if you don't glue it??
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Old 11-25-2020, 03:20 PM
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Originally Posted by Ofna2005
What os based motor best compares to the spec 3 motor ? I have been waiting hoping they would release a new model but havenít seen anything on the horizon.
The lrp zz21 long stroke David angaro is a spec 2 if this helps
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Old 11-29-2020, 12:27 PM
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Originally Posted by maximax
Hi everybody , I would like to know what do you use to glue thermo insulator on 21J carb??? Or if you don't glue it??
I've used a dab of CA glue just to secure it. The pinch bolt secures the entire assembly.
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