Does anyone have a MVVS .77 that runs right? Mine has been back to Morris Hobbies 3 times and still can't complete two flights in a row without the second being a dead stick.

I'll be seeing you,


How much total time have you got on your .77 (the engine stabilizes and reaches its full performance and reliability, after 8-10 hours. That is 48-60 10 minute flights.)?

How was the break-in performed (according to [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]this RCU thread[/link] is best)?

Do you use 20-22% oil, at least half of which is Castor oil, with no more than 5% nitro (Sig Champion, or PowerMaster GMA, or others, if you don't like to mix your own)? No, you can't use fuel that doesn't comply with this, unless you installed an extra head shim and then you can raise the nitro to 10-12%, but the oil must be as described.

Does your engine have the newer carburettor (send close-up photo(s))?

How do you adjust it?

Is you tank at the proper level (fuel jet) and fully isolated from any part of the airframe, with latex foam?


I hope this helps.

I have had mine for about 3 years in a GP F-14 and it runs like a champ, I have a full length quiet muffler from macs i have it shimmed for 10-15% fuel and run full synthetic at about 18% with absolutely no problems what so ever. I use a #3 or #4 enya plug run it on the rich side.

I love these engines

Rubbie,


MVVS engines are tough.
But still, I hope this fact doesn't come back and bite you in a while.

Castor oil is best for them.

Thanks for the note. The engine has about 4 hours running time. It will run fine for a 10 minute flight the without changing any of the adjustments, die part way through the second flight. It dies while flying 1/3 to 1/2 throttle. It's a real puzzle to me. I'm told that they put a new carburator on it the last time I sent it in. But I'm not too sure as the throttle arm looked just like the one I had on the original carb. I enlarged one hole for a ball connector.

Any ideas?