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I have obtained YS 60 motor from Yahoo Auction as usual, this is the first period production of Yamada Manufacturing Co., not Schnuerle scavenging but self cross flow method with ringed piston. As for much surprise, the distorted carburetor body is connected with front housing, so they are one piece cast design. The angular distorted intake port resembles with Italian Super Tiger 46 model.

Long thrown away untouched motor containing oxidized residual grow fuel has some miserable result, rusting, stuck with hard vanish and carbon. In spite of sever condition as it has, my sweaty and desperate effort could disassemble it thoroughly at last.
Careful checking by removing smear layer on the crank shaft supporting main bearing surface suddenly stopped my working, #6002 does not exist in my stock, before disassembling imagined I to be #6902, because JIS 69 line bearing had been mainly invited for 60 motors by every company, especially the latter YS models, 6902 is for 60SR and #6903 is for 60FS and 60FR, those are my favorite ones with the most familiarity.
Careful checking on original #6002 main bearing after removing clogged sludge and vanish dust, no destructive damage and backlash in radial direction were observed, but frontal bearing #608Z was damaged by rusting. So, only frontal bearing was replaced into new one found in my stock.

Work finishing accuracy is very high reflecting some motivational great energy by Mr. Yamada at that time. Rear cover plate has a engraving for gas flow to the secondary combustion room as shown.
Even old fashioned YS 60 motor has well designed over deeper consideration with fuel pressurized and regulator controlling system, including fine finishing technology, front housing engraving for crank shaft bearings, their distance is precisely machined, probably this motor would become with Golden Age models such as MK Thunderbird or Taurus establishing pressurized stable fuel supply relying on marvelous YS regulator system. In addition, the muffler for old ENYA 60X just fits for this 60 motor without any modification.
I'm sure to invite this motor on my new GA construction in very near future.

8 mm extension backward of Tuned Pipe on "Hornet" could make an ordinary condition of YS 45 FR motor, the adjustment procedure following Mr. Sugawara's suggestion was to the point. Scientifically proved truth and fact do not change no matte how he is not our world. 15 degree opening regulator adjustment on the middle speed mixture made the stability and transition more certain.

OS 32 FX motor under normal aspiration was tested on PILOT Ace B prioritizing on the suitable peak needle point, because the fault on that point spoiled the challenge at Toyokawa meeting the other day. As a matter of fact, even with normal condition I should not be suffered from "lean needle valve setting" in the scenery of a second half.

My intimate friend came with me for early morning flight training, who is a quite a stranger in Radio Control Model Airplane field. Almost retired person as a representative of a foreign trading company as he is, he has enough time to focus and immerse on our hobby field and have I some planning to pull into ours.
Now I'm looking up to a slow flight glider hanging down from the ceiling, TETRA Phimpy 15.

Preparing for the next meeting on 24th September, MK Star series, 15 and 06 are under construction, interchangeable 6 motors are so modified to apply rubber mounting method.
Rubber material applied in motor mounting spaces are indispensable buffer to prevent vibration caused by combustion, so to speak knocking vibration.
This method extends lives of servo potentiometer inside. Otherwise the vibration would be propagated everywhere to the body, especially the main wing would play a part of some speaker vibrating plates resulting to noisy flight.
OS 25 FP, Thunder Tiger 25 and ancient Maccoy 19 are for 15 and OS 10 FSR, OS 11 CZ and ENYA 09 are for 06 promptly. Maccoy 19 wears ENYA carburetor and one-off muffler adaptor for OS 702 muffler.
I must make haste to be on time at D-Day. Outfitting of servos and linkages takes time for 2 model airplanes contrary to my early expectation.
I made a way off the road by making balsa cutting for new "Tauri" as my habitual escape behaviors. Natural and innate bad trend of myself does not change from my childhood after living over a half century.

YS 45 FR motor in unstable and stopping in the second half of the maneuver pattern shows that the time is come to extend the Tuned Pipe backward.
Thank to a precious advice by Mr. Yasufumi Sugawara who had been a chief staff of Ogawa Precision Mfg. Co. , the countermeasure could be imagined immediately.
Remembering my past, he gave me tremendous advises, they were not mealy thought opinions but were all scientifically proved truth and fact from a standing point of view as a manufacturer, based on actual trial and experiments.
But now it is impossible to hear from him anything, because he had gone away high up to the sky a few years ago, leaving me much gorgeous memories those will not die.

Finding out a dead dragonfly " Gynyangma", checked it I so carefully as to regarding a flying object.
All the construction is so designed to be suitable for fly and move quickly to catch worms and escape from predators.
Wings are very light with necessary physical strength forming beautiful shape, and their movements are precisely controlled by Myoneural system.
Sophisticated eyes are big round compound covering wide angle, gathering more information around to keep their safety.
Fuselage is thin Exoskeleton construction with several joints, provably there must be many muscles without lean.
The color designing is distinguishable for opposite gender, nothing but beautiful without any break down from every direction, contrast, color coordination and vividness are critically balanced.
Is it possible to make the same utilizing recent industrial technology such as servo controlling and computer controlling programming?
The answer is easily guided to negative, because we cannot give it the ultimate capability to create the next generation.

The main parts of enlarged "Tauri" have prepared with balsa material, relatively large horizontal stabilizer area and additional axial extension of main wing might meet with a 60 motor with an ordinary muffler. 60 4-cycle acceptable motor mount space would be invited 2-cycle motors without any desperate effort including CG adjustment. In addition, symmetrically designed airfoil with 20% camber must play considerable aerodynamic resistance, so the possibility of introducing 60 motor would be high.
YS 60 SR or 60 FS would be mainly burdened on this new construction, in addition, OS 60 FSR, ENYA 60X, OPS 60 and K&B 60 for the military target machine towing airplane would be tested under the condition of YS Regulator System equipped.
Anyway, great interests & Joyful moment with new "Tauri" would be desired.