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.
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