I have a 46 EVO and a 52 that is the strongest 46 i own by a few hundred RPMs
i have both OS ST and ASP engines in that size
The evo has a --chrome liner --and they are very inexpesive ( actualy cheep ) and overlooked by the masses for what they offer in performance
Paid 25 dollars at a swap
I have a very excellent 75 ASP FSR ABC for sale
Turns a 12/6 APC at 12,000 RPMS
i have worn out two of these engines with about 100 hours each on them
The one for sale has less than a gallon thu it
Great high compression and bearings
You can view my Galley of the best two cycle glo engines and airframes in the last 20 years
Many have hundreds of flights on them and are 5 to 20 years old in many cases
The OS 61SF 91FX 75AX and possibly the very best glo engine EVER made the OS 1.08 FSR BX1 are my personal OS favorites
Os hands down makes the very best carbs for glo engines and i use them in any possible other engine i can to improve that engines performance ( ASP ST)
I do not understand all the issues here with wearing out engines ( liners )
Mostly not enough oil ( must use castor ) and running engines to hot and lean or you have an air leak in your engine causing excessive HEAT and burning up ( cooking ) you glo engine
I pull my engines apart when required only to find them brand new looking inside
I use 15% Morgan Omega with some extra castor oil especially for of brand engines with no wear issues at all
Cool Power is an engine distroyer as it does not control the lean heat build up thing well
Enjoy