Anyone know what number Boca Bearings kit are a replacement for the factory bearings in  ST-46 engines? A search yielded no results. Thanks in advance.

  I think that all G21 (G21/.29, G21/.35, G21/.40, G21/.46) series engines are the same but Randy would likely know. Given my assumption is right, it's ENK-079xx

   What I would do instead (and have) is take the bearings out, take it to an industrial bearing supply store, hand it to them and say give me a new one. Last time I did that (at King Bearing in Mountain View, CA) the kid looked at it, walked straight to it, straight back, and said "$7" in the space of maybe 15 seconds.

    Brett

Thanks Brett, that's what I needed to know. 

   Bear in mind I am not certain!

   Brett

Got it, I will confirm the ## before I order but is sounds right. Same as the ST-60(Old style) bearings also fitting the V-51 and V-56 which also share the same case.

No  they are not the same, only the front bearing is the same, but it will be best to not use what was stock supplied by ST, for the front use a 607-2RS  and remove one of the rubber seals
The rear is smaller than the ST 51 56 60, it is better if you use a phenolic race bearing for the rear.
I have these in stock also

Randy

 I think that all G21 (G21/.29, G21/.35, G21/.40, G21/.46) series engines are the same but Randy would likely know. Given my assumption is right, it's ENK-079xx

   What I would do instead (and have) is take the bearings out, take it to an industrial bearing supply store, hand it to them and say give me a new one. Last time I did that (at King Bearing in Mountain View, CA) the kid looked at it, walked straight to it, straight back, and said "$7" in the space of maybe 15 seconds.

    Brett

Hi Brett That is correct, and the front bearing is also the same in the ST 51  56  60.  The rear is much larger

It was pretty interesting that ST could  bore and stroke the G21-29 out all the way to 46 (then I took it out to 49 and 55)  That engine served so many, and varied different modeling events, speed, combat, RC boat racing, RC sport, CL Aerobatics, and more.

Randy

Hi Brett That is correct, and the front bearing is also the same in the ST 51  56  60.  The rear is much larger

It was pretty interesting that ST could  bore and stroke the G21-29 out all the way to 46 (then I took it out to 49 and 55)  That engine served so many, and varied different modeling events, speed, combat, RC boat racing, RC sport, CL Aerobatics, and more.

    Just like some wacky guy put a 36, 40, 51 61 and 65 into the same case?  The G21/46 looked stretched and stuffed in every possible way into the regular case just like the PA61/65. The die used to be the hardest/most expensive part, makes sense it would be reused to the extent possible.

    Brett

I used to run G 21 35 in combat. We would use 607-Z for the front, shield one side. No rubber seals.