Yamada FZ 53 rebuild story and first run

This Yamada (Futaba in US) FZ 53 4 stroke RC engine was bought on eBay over 2 years ago.
It was sold in "pre owned" condition. When the back cover of an engine was opened, I've got quite a negative surprise. Former owner of an engine, as far as I understand from the internal signs (I'm not a Sherlock Holmes :-) yet), was make a kind of main bearing replacement, but he was not able to install a new main bearing exactly into the place. He decide, I think, to reduce the bearing height by grinding it on a sand stone or else. That could be the key reason of an engine sudden death. One of the balls (or part of the bearing separator) from the bearing was escaped and appears inside the case, in between of rotating crankshaft and case walls. This ball or part of separator was immediately milled inside into metal powder, with with immediate result - engine was jammed. I think, that this story could be very much close to the truth. Of course, engine was rebuilt practically from scratch, it takes a lot of time to complete the engine with all necessary spare parts. So, right now it is just a few seconds of firstly running engine. The whole story will be available few day's later, I'm currently working on editing.
Thank you for watching !

[@ILLEagle_1]

That idle sounds soo smooth! I like the idea of using a rubber band to keep the crank at top dead center while timing the camshaft

[@crazyengines88]

Thank you very much for your kind comment ! Getting such a positive feedback from CrazyEngines viewers and subscribers, definitely, greatly motivate me to continue the Project. I'm working right now with engine fine tunings, specially, in idle area. So, stay tuned, and probably, even better idle you can hear soon. Have a nice day !

[@125saito]

Very, very well done sir. I think it's lucky that the engine case did not crack from the internal stresses which were obviously present. Thank You.

[@crazyengines88]

Great comment, thank you very much ! Appreciated for such nice words, thank you ! Sp, stay tuned, the Part 2 is already is on the way ! Have a nice day !

[@mikeeiben3430]

I was impressed by the design of the piston, it seemed to have a unique design from the quick view of it. I like YS engines a lot.

[@crazyengines88]

Thank you for your comment ! Absolutely agree with you ! A lot of attention to the smallest details - definitely, the Yamada engineering sign. Complicated engines of course, took much more time to work with, but the result is also, like a prize. You invest your funds (time and money) into the engine and engine is serving you with performance and stable result. I like YS engines, and it doesn't matter, in what condition I received it. Thank you and have a nice day !

[@xKmotx]

Only because you are a master mechanic, the engine live again! Well done! 👍

[@crazyengines88]

Thank you a lot for so great comment ! It is very nice to hear from such an experienced person and specialist ! Thank you very much ! Stay tuned, there is a Part 2 on the queue. Have a nice day !

[@billjones3071]

Fantastic sound nice job, I love glo engines but always thought YS was overly complicated so I never purchased one

[@crazyengines88]

Thank you for your nice comment ! Definitely, YS engines are much more complicated, than typical glow engines. From one side, YS constructional; complication is only the way how to increase power / wait factor and I should say, that from this side Yamada was make really great job. From the other side, to obtain stable performance, YS engines always need to be precisely tuned before flight. But, once tuned, it could be handle this settings for a long time, I don't know, how long, to be honest. My experience with YS confirm, that it will take time to tune an engine into perfect operational state. But probably, the gain in power and performance could greatly compensate this time investment. Thank you for your comment ! Have a nice day !

[@vulturedroid9804]

Beauty well done. Running like a top.

[@crazyengines88]

Thank you very much for your comment ! Greatly appreciated ! Still working with YS FZ 53 idle, hoping, soon will be an update, so stay tuned ! Thank you and have a nice day !

[@wagnerfratelli3500]

Uma bela ressurreição mecânica...

[@crazyengines88]

Muito bom comentário, muito obrigado! Tive que "pouco" trabalhar neste motor, acabou por ser um caso "difícil". Mas não temos medo de tais dificuldades, estamos trabalhando mais. Em breve haverá uma segunda parte, ainda mais interessante que esta.

[@TestECull]

I think I have a use for my FZ-53! Bought a Balsa USA Northstar at my LHS and I don't care for 2-strokes all that much, so this poor little FZ-53 I've had for a couple years with nothing to do finally has a home. Prop chart goes 10-9, 10-10, 11-7, 11-8, 12-7, 12-8, so I think given the airplane's limited prop clearance, I will use a 10-7-3.

[@crazyengines88]

Great news ! Yamada FZ 53 should be a very perfect choice, for sure. How do you think, could it turn 11 x 10 prop or its clearance is to high ?

[@TestECull]

@@crazyengines88 Even an 11-10 would require either lifting the engine pod higher up or slotting the wing. A 10-7 3-blade is roughly equivalent in load to a 11-7 2-blade but will clear the wing without any modifications, and the manual for the FZ-53 says an 11-7 2-blade is perfectly acceptable. The manual even calls out a 10-9 or 10-10 as acceptable props. Unthinkably small for a normal 4-cycle this size, but YS engines are thoroughbreds!

[@crazyengines88]

OK, copy that, thank you for explanation !