PlaneKrazee
Posts: 3515
Joined: 5/15/2002
From: Westerly, RI, USA
Status: offline
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The Enya will need about two gallons of 5% fuel to break in and until then it vibrates heavily and runs pretty hot. Heat cycle the engine in short 3 to five minute runs gradually leaning each run until you get to peak rpm. If the engine will hold peak rpm, run it 100 rpm down from peak for 3 to 5 minutes for several more runs with complete cools downs between each run until you put at least a gallon thru it.
I had to massage the carb and choke detent for proper operation. You choke the engine by setting the carb at idle and pulling the choke rod which slides the barrel to port, pull the prop thru a few times, push the choke rod back in and connect the glow driver. Wearing a glove give it a back flip against compression and it should get going but be careful! Until it's broken in it can bite your knuckles hard!!! I also made a velocity stack to get the fuel back into the carb. The muffler is extremely loud with a sharp bite so I made a custom muffler for each installation. Make sure you don't set the carb too lean on the airbleed. It is easy to get it too lean and it won't transition properly. This engine likes to be a little rich on the low end and even inverted you will get a nice low idle with it rich.
After about ten or twelve gallons I tore one 155 engine down because the front bearing was showing signs of slinging rusty looking oil. I changed both crank bearings but there were no signs of wear whatsoever on any internal parts! The ring still had the machining marks. I do make sure my engines are at least 100 rpm rich at all times running a Cline regulator, they were inverted and run on between 5% and 15% nitro with 18% oil 80/20 synth/castor. On 10% nitro I was getting at least 9000 rpm with an APC 17X6, the same as the OS 120AX two stroke but using less fuel. The engine can also turn a APC 18X6 around 8000 rpm but must be well run in and cooling air properly ducted in and out.
The exhaust on the 155 is probably the hottest of any four stroke I have ever run even when I know it's set a little rich. Overall I thought it was an excellent engine but the stock muffler sucks and you will at a minimum need to get the flex pipe and remote muffler, also make a intake pipe at least an 2.5 cm long to increase fuel economy greatly.
Run it and tell me if you have the same findings. Also if you find you don't have good compression you may have to carefully seat the valves with Mother's mag wheel polish. It is a very fine polishing compound for aluminum and when done properly will not do any damage.
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RE: Saito 220 or OS FS200 - 
