Questions on OS .21

[t_fusaro]

View attachment 12333

View attachment 12334

View attachment 12335

I picked up an older ofna lx with an os max .21rz engine. It seemed to be siezed when I first got it. I took it apart and cleaned it and it seems to be fine. can't start it cause I dont have a bump box yet. It is an older os engine and I can't find anywhere to get parts. Id like to rebuild it. Anyone know where to get parts or if its even worth it? How do I find out what model it is?

 

[fescue101]

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAMZ7&P=FR

---------- Post added at 10:35 PM ---------- Previous post was at 10:32 PM ----------

http://www3.towerhobbies.com/cgi-bin/wti0095p?FVPROFIL=++&FVSEARCH=os+max+.21+rz&search=Go

 

[olds97_lss]

Looks a lot like the old 21RG. Must be a better ported/tuned version of that. The head looks identical except the blue tint.

 

[alkyula]

thats an os rz v01b. when it was new it was o.s. top of the line 1/8 buggy .21 racing engine. as for replacement parts, ebay i guess.

 

[hotrodrob]

Looks like it had a boost bottle installed

transmited from a mobile communications device

 

[olds97_lss]

I think it was a pressure stabilizer line that connected the carb neck to the crank case. There's a spicket on the back plate.

Is kind of cool to look back at how we used to eek all the power/tunability/reliability we could out of these little engines back in the day.

 

[t_fusaro]

Thank you all so much. It is a boost doesn't run right without it. It recycles pressure. It is fast. Not easy to tune. Hard to start unless its heated first. Love to see it with a rebuild, but its to much to do I can buy a new. I'm looking at gettin a quarter scale so ill sell it or trade it.