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Cox Engine of The Month
July-2024
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
1971 OS 25 max
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1971 OS 25 max
hello, i got a os 25 max from 1971 from a hobby shop for $10 that i am restoring to resale, can anyone tell me information on this engine and i noticed on the carb when i removed it from the crankcase that there is a huge crack that bsically renders the rc carb useless and i was wondering if anyone could hook me up with a new carb for this engine
compression is perfect, has the flanged piston and a strap on muffler
Thanks, Mitchg95
compression is perfect, has the flanged piston and a strap on muffler
Thanks, Mitchg95
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 29
Location : Geneva, mn, USA
Re: 1971 OS 25 max
mitchg95 wrote:hello, i got a os 25 max from 1971 from a hobby shop for $10 that i am restoring to resale, can anyone tell me information on this engine and i noticed on the carb when i removed it from the crankcase that there is a huge crack that bsically renders the rc carb useless and i was wondering if anyone could hook me up with a new carb for this engine
compression is perfect, has the flanged piston and a strap on muffler
Thanks, Mitchg95
This might help, Mitch, friend of mine saw your request, he's not a member here so can't post it, so he asked me to do so, if you have the part numbers you can probably still get the parts from OS if all else fails, they supply most parts for their older engines
Wilf
![1971 OS 25 max Os_max11](https://i.servimg.com/u/f41/16/91/01/95/os_max11.jpg)
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Re: 1971 OS 25 max
thanks Wilf, i also do need a crankcase gasket
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 29
Location : Geneva, mn, USA
Re: 1971 OS 25 max
Is your engine like the picture with the drop-in liner or is it the older version with the steel cylinder fins? I can't remember when they switched. They may have used the same type carb. The steel fin version was highly regarded in its day. Don't have the newer one but it was probably also a good runner.
Both are iron/steel so should get a break-in. Fuel should contain 20%-22% lube, preferably half castor.
If I understand correctly, you do not intend to run it but restore it to sell. Could you post a pic of the carb you want so folks could help you with an original? Otherwise, most any carb that would fit the crankcase would do.
George
Both are iron/steel so should get a break-in. Fuel should contain 20%-22% lube, preferably half castor.
If I understand correctly, you do not intend to run it but restore it to sell. Could you post a pic of the carb you want so folks could help you with an original? Otherwise, most any carb that would fit the crankcase would do.
George
gcb- Platinum Member
- Posts : 908
Join date : 2011-08-11
Location : Port Ewen, NY
Re: 1971 OS 25 max
thanks Gcb, ill try to get pictures posted sometime today or tomorrow
mitchg95- Diamond Member
- Posts : 2103
Join date : 2011-12-19
Age : 29
Location : Geneva, mn, USA
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