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Old 08-12-2017, 01:28 AM   #1
NoGoodMike
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Main Bearing Colors

My nephew "windowed" the case on his '03 YZF600R. Picked up a used case set. Punched the numbers off the crank, and back of the case, in the "formula" and it gives me each main bearing's respective color.
Main bearing color sequence starting from the number one cylinder: Brown, Brown, Black, Brown, Brown, Blue
"Plasti-gauged" it four times. Service manual puts "the bubble" at 0.003" and I'm getting 0.001" everywhere. It's 0.002" too tight across each main bearing. What color sequence will put me "on the bubble"?
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Old 08-12-2017, 02:03 AM   #2
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Patrick from Motorcycles Unlimited might can chime in here.
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Old 08-12-2017, 12:06 PM   #3
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Hey Mike, can you explain what this means? I haven't a clue what you are talking about. Its a teachable moment
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Old 08-12-2017, 01:39 PM   #4
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did you do it at the same point on the crank or did you rotate it?
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Old 08-14-2017, 08:28 PM   #5
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@ Japawhat02
Yes sir -- I plasti-gauged it four times. Wiped the surfaces clean before assembly each time.
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Old 08-14-2017, 08:39 PM   #6
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Yamaha stamps a series of numbers on the counterweight of the number one rod, as well as on the back of the upper case. Enter the corresponding numbers in a "formula" provided in the service manual and it'll spit out a value. Find your corresponding value in the bearing color chart and there you go (theoretically). Then you order the bearings by color. I plasti-gauged it four times after crunching the numbers six times. All six mains are 0.001" (0.002" too tight).
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Old 08-14-2017, 08:47 PM   #7
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My bad -- "... sequence of numbers ..."
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