I have a new in box Evolution Trainer Power System Engine...The Evolution engine...I can not determine if it is rated .40 or .45....The box is black and the only description on the box to identify which engine is EVOE 100.....The enclosed paper work shows it as a .45 but there is no identifying marks or numbers on the engine...All advertisements for this engine shows three models.....40 .45 .60 .....with three identifying codes none of which are the EVOE 100 on my box....It must be an early design and they have changed the ID codes...Anyone out there that knows which engine I have .....please let me know...Richard

Richard, does it have a small a on the side of the outermost head fin? That stands for alpha (the trainer plane) and it would actually be a .455c.i. The latest ones are .40, .46 and .61...As to why they'd make a .455 and a .46, your guess is as good as mine. We (our club) bought the Xtra Easy 2 trainer, and it has the Alpha's .455 engine. I put a different prop (11x6 MAS) on 'er and it transformed the plane, it's bigger than the Alpha, and needed more thrust. Good running engine, but we're wondering how long it's gonna last...

Yes the engine has the ( a ) on the fin ....so I must have the .455, thanks for the info and help.....I will use the 3 blade prop to start and then later change to the 11 x 6 MAS....Richard

Does anyone know where I can find carburetor specs for this engine

Don't know why Evolution made both the .455 and the .46. It is very confusing. The .455 (alpha engine) has milder porting than the .46 which allegedly makes it more user friendly, but I have never noticed the difference. These alpha engines are very good engines, very durable, easy to start and seem to last a long time. They come from the factory with a flywheel, a limiter on the needle valve and a three bladed prop. If you open the box and throw all three of those items in the trash and put a proper prop on it, you will probably like it. I am constantly amazed at the number of Evolution .46 engines I see for sale but when I look closely at them, a lot of them have the stylized "a" on the side of the head.

I have a very well worn Evo and its a great runner. I installed new bearings and it runs great.

Do you know if there is a rebuild kit available for this carburetor

I would imagine the only rebuildable items on the carb are the O-rings. And a rebuild in this case is really a "clean up" job. Sometimes there is gunk build up from Castor but that is about all there is to it. To get rid of the Castor build up, boil it in a pot water for 15 or 20 minutes, and flush it out. O-rings you will need to find in the parts list and order them up. Good luck.

thanks, i did as you advised and took it all apart after cleanup went to my local hobby shop and he had the o-rings , put it all back together started up first try and running great.. now i have to work with the idle .. with the barrel all the way closed it's still humming a long pretty good (fast Idle) .



thanks for the reply

If it's running with the barrel all the way closed, you have a major air leak.

Try sealing the stem of the carb with a little RTV

Ok that's right and explains why I had review on it before it had been so long ago I had forgotten about that.. this is the first time running any of my stuff in several years.. until this trade my last post on here was 2006 I believe..

Thanks for all the help

I've found this to be a problem with multiple Evolution engines recently. My early EVO 46 engines ran great with no problems (5+ years old). I recently purchased (last 2-3 years) 52 and 61 engines. Both will not shut off when the carb barrel is fully closed. I've given up on EVO engines for this reason. Just replaced the 61 with an O.S. 65AX and will be replacing the 52 with an O.S. 46AX as soon as the 65 is broken-in and flying. I'd rather be flying than troubleshooting air leaks. Overall, I've found that my planes with O.S. engines run more reliably.

https://www.youtube.com/watch?v=XxKgrqlmTDc
Mine runs like a champ

Proptop, the Alpha is not the .455 TPS engine. Rather, it is a .40 that uses the same carb, cylinder, cylinder head, crankcase, and backplate as the 46NT. The 46 is actually a bored out 40 with a longer stroke by way of the crankpin placement on a different crankshaft with a longer rod. The 46 liner is thinner, so that's the larger bore.

The .455 is a totally different engine, and to confuse things, it has an 'a' on the cylinder head for decoration. I've bought 7 or 8 46s and own a well used .455 that I love. It is my favorite 2 stroke engine.

Periodically we need to mention that Evolutions, at least up to the last year that I'm aware of, all run terrible with OS 8 glow plugs. These are too cold. The Evos need hotter plugs.

BTW, since the 46 is actually a 47 you are better off using the 40 crankshaft and shorter rod because it is better balanced over the 46 crank.